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Commitments and Contingencies (Details) customer_account in Millions, $ in Millions		3 Months Ended	24 Months Ended	39 Months Ended
	Jan. 05, 2023 customer_account	Jun. 30, 2022 USD ($)	Dec. 31, 2023 USD ($)	Sep. 30, 2026 USD ($)
Loss Contingencies [Line Items]
Legal settlement paid				$ 350
Aggregate incremental expense			$ 150
Number of customer accounts impacted \| customer_account	37
Income Statement Location [Axis]: us-gaap:SellingGeneralAndAdministrativeExpense
Loss Contingencies [Line Items]
Aggregate incremental expense		$ 400

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 450
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 9
-Subparagraph (a)
-Publisher FASB
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Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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Reference 8: http://www.xbrl.org/2003/role/disclosureRef
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Reference 9: http://www.xbrl.org/2003/role/disclosureRef
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+ Details

Receivables and Related Allowance for Credit Losses - Schedule of Equipment Installment Plan Receivables by Credit Category (Details) - USD ($) $ in Millions	Sep. 30, 2026	Dec. 31, 2025
Financing Receivable, Credit Quality Indicator [Line Items]
EIP receivables, net of unamortized discount	$ 7,357	$ 8,060
Current - 30 days past due
Financing Receivable, Credit Quality Indicator [Line Items]
EIP receivables, net of unamortized discount	7,163
31 - 60 days past due
Financing Receivable, Credit Quality Indicator [Line Items]
EIP receivables, net of unamortized discount	85
61 - 90 days past due
Financing Receivable, Credit Quality Indicator [Line Items]
EIP receivables, net of unamortized discount	56
More than 90 days past due
Financing Receivable, Credit Quality Indicator [Line Items]
EIP receivables, net of unamortized discount	53
Prime
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in 2026	3,638
Originated in 2025	2,222
Originated prior to 2025	255
EIP receivables, net of unamortized discount	6,115
Prime \| Current - 30 days past due
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in 2026	3,589
Originated in 2025	2,182
Originated prior to 2025	247
EIP receivables, net of unamortized discount	6,018
Prime \| 31 - 60 days past due
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in 2026	25
Originated in 2025	17
Originated prior to 2025	3
EIP receivables, net of unamortized discount	45
Prime \| 61 - 90 days past due
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in 2026	13
Originated in 2025	12
Originated prior to 2025	2
EIP receivables, net of unamortized discount	27
Prime \| More than 90 days past due
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in 2026	11
Originated in 2025	11
Originated prior to 2025	3
EIP receivables, net of unamortized discount	25
Subprime
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in 2026	748
Originated in 2025	451
Originated prior to 2025	43
EIP receivables, net of unamortized discount	1,242
Subprime \| Current - 30 days past due
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in 2026	696
Originated in 2025	411
Originated prior to 2025	38
EIP receivables, net of unamortized discount	1,145
Subprime \| 31 - 60 days past due
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in 2026	23
Originated in 2025	15
Originated prior to 2025	2
EIP receivables, net of unamortized discount	40
Subprime \| 61 - 90 days past due
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in 2026	16
Originated in 2025	12
Originated prior to 2025	1
EIP receivables, net of unamortized discount	29
Subprime \| More than 90 days past due
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in 2026	13
Originated in 2025	13
Originated prior to 2025	2
EIP receivables, net of unamortized discount	$ 28

Condensed Consolidated Statement of Stockholders’ Equity (Parenthetical) - $ / shares	3 Months Ended		9 Months Ended
	Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025
Statement of Stockholders' Equity [Abstract]
Common stock, dividends declared (in USD per share)	$ 1.17	$ 1.02	$ 3.21	$ 2.78

Condensed Consolidated Statement of Stockholders’ Equity - USD ($) $ in Millions	Total	Common Stock Outstanding	Treasury Stock Outstanding	Par Value and Additional Paid-in Capital	Accumulated Other Comprehensive Loss	Retained Earnings
Beginning balance of common stock (in shares) at Dec. 31, 2024		1,144,579,681
Beginning balance of treasury stock, (in shares) at Dec. 31, 2024			126,494,683
Beginning balance at Dec. 31, 2024	$ 61,741		$ (20,584)	$ 68,798	$ (857)	$ 14,384
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	8,889					8,889
Dividends declared	(3,118)					(3,118)
Other comprehensive income (loss)	(24)				(24)
Stock-based compensation	596			596
Stock issued for employee stock purchase plan (in shares)		1,150,449
Stock issued for employee stock purchase plan	214			214
Issuance of vested restricted stock units (in shares)		4,627,936
Shares withheld related to net share settlement of stock awards and stock options (in shares)		(1,491,249)
Shares withheld related to net share settlement of stock awards and stock options	(394)			(394)
Repurchases of common stock (in shares)		(30,444,090)	30,444,090
Repurchases of common stock	(7,475)		$ (7,475)
Other, net (in shares)		83,513	(9,577)
Other, net	48		$ (5)	53
Ending balance of common stock (in shares) at Sep. 30, 2025		1,118,506,240
Ending balance of treasury stock, (in shares) at Sep. 30, 2025			156,929,196
Ending balance at Sep. 30, 2025	60,477		$ (28,064)	69,267	(881)	20,155
Beginning balance of common stock (in shares) at Jun. 30, 2025		1,127,450,618
Beginning balance of treasury stock, (in shares) at Jun. 30, 2025			146,725,778
Beginning balance at Jun. 30, 2025	61,107		$ (25,569)	69,008	(908)	18,576
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	2,714					2,714
Dividends declared	(1,135)					(1,135)
Other comprehensive income (loss)	27				27
Stock-based compensation	216			216
Stock issued for employee stock purchase plan (in shares)		437,777
Stock issued for employee stock purchase plan	89			89
Issuance of vested restricted stock units (in shares)		1,175,288
Shares withheld related to net share settlement of stock awards and stock options (in shares)		(365,677)
Shares withheld related to net share settlement of stock awards and stock options	(92)			(92)
Repurchases of common stock (in shares)		(10,204,072)	10,204,072
Repurchases of common stock	(2,494)		$ (2,494)
Other, net (in shares)		12,306	(654)
Other, net	45		$ (1)	46
Ending balance of common stock (in shares) at Sep. 30, 2025		1,118,506,240
Ending balance of treasury stock, (in shares) at Sep. 30, 2025			156,929,196
Ending balance at Sep. 30, 2025	$ 60,477		$ (28,064)	69,267	(881)	20,155
Beginning balance of common stock (in shares) at Dec. 31, 2025	1,106,930,661	1,106,930,661
Beginning balance of treasury stock, (in shares) at Dec. 31, 2025	168,843,574		168,843,574
Beginning balance at Dec. 31, 2025	$ 59,203		$ (30,545)	69,460	(848)	21,136
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	9,198					9,198
Dividends declared	(3,419)					(3,419)
Other comprehensive income (loss)	253				253
Stock-based compensation	683			683
Stock issued for employee stock purchase plan (in shares)		1,322,243
Stock issued for employee stock purchase plan	213			213
Issuance of vested restricted stock units (in shares)		4,254,520
Shares withheld related to net share settlement of stock awards and stock options (in shares)		(1,340,592)
Shares withheld related to net share settlement of stock awards and stock options	(271)			(271)
Repurchases of common stock (in shares)		(48,372,465)	48,372,465
Repurchases of common stock	(9,555)		$ (9,555)
Other, net (in shares)		50,899	(4,423)
Other, net	$ 2		$ (2)	4
Ending balance of common stock (in shares) at Sep. 30, 2026	1,062,845,266	1,062,845,266
Ending balance of treasury stock, (in shares) at Sep. 30, 2026	217,211,616		217,211,616
Ending balance at Sep. 30, 2026	$ 56,307		$ (40,102)	70,089	(595)	26,915
Beginning balance of common stock (in shares) at Jun. 30, 2026		1,074,817,571
Beginning balance of treasury stock, (in shares) at Jun. 30, 2026			203,587,868
Beginning balance at Jun. 30, 2026	56,265		$ (37,667)	69,879	(635)	24,688
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	3,455					3,455
Dividends declared	(1,228)					(1,228)
Other comprehensive income (loss)	40				40
Stock-based compensation	217			217
Stock issued for employee stock purchase plan (in shares)		567,538
Stock issued for employee stock purchase plan	78			78
Issuance of vested restricted stock units (in shares)		1,554,628
Shares withheld related to net share settlement of stock awards and stock options (in shares)		(478,388)
Shares withheld related to net share settlement of stock awards and stock options	(86)			(86)
Repurchases of common stock (in shares)		(13,621,695)	13,621,695
Repurchases of common stock	(2,434)		$ (2,434)
Other, net (in shares)		5,612	2,053
Other, net	$ 0		$ (1)	1
Ending balance of common stock (in shares) at Sep. 30, 2026	1,062,845,266	1,062,845,266
Ending balance of treasury stock, (in shares) at Sep. 30, 2026	217,211,616		217,211,616
Ending balance at Sep. 30, 2026	$ 56,307		$ (40,102)	$ 70,089	$ (595)	$ 26,915

Subsequent Events (Details) - USD ($) $ / shares in Units, $ in Millions		1 Months Ended	3 Months Ended		9 Months Ended
	Oct. 09, 2026	Oct. 23, 2026	Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025
Subsequent Event [Line Items]
Purchase price			$ 2,434	$ 2,494	$ 9,555	$ 7,475
2026 Stockholder Return Program
Subsequent Event [Line Items]
Repurchases of common stock (in shares)			13,621,695		48,372,465
Average price paid per share (in USD per share)			$ 177.31		$ 195.81
Purchase price			$ 2,400		$ 9,500
Subsequent Event \| 2026 Stockholder Return Program
Subsequent Event [Line Items]
Repurchases of common stock (in shares)		4,987,500
Average price paid per share (in USD per share)		$ 158.68
Purchase price		$ 791
Subsequent Event \| Ka Ena Corporation
Subsequent Event [Line Items]
Business acquisition, equity transferred for earnout obligation (in shares)	1,510,371

- Definition

Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
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+ Details

- Definition

Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

+ References

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+ Details

Debt - Schedule of Variable Interest Entities (Details) - USD ($) $ in Millions	Sep. 30, 2026	Dec. 31, 2025
Debt Instrument [Line Items]
Equipment installment plan receivables, net	$ 4,530	$ 4,997
Equipment installment plan receivables due after one year, net	2,457	2,683
Other current assets	2,686	5,372
Accounts payable and accrued liabilities	8,624	10,280
Short-term debt	6,343	5,135
Variable Interest Entity, Primary Beneficiary
Debt Instrument [Line Items]
Equipment installment plan receivables, net	2,203	1,865
Equipment installment plan receivables due after one year, net	784	543
Other current assets	310	232
Accounts payable and accrued liabilities	3	3
Short-term debt	861	594
Long-term debt	$ 1,632	$ 1,401

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

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+ Details

- Definition

Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer.

+ References + Details

Stockholder Return Program (Details) - USD ($) $ / shares in Units, $ in Millions					1 Months Ended	3 Months Ended					9 Months Ended
	Dec. 10, 2026	Sep. 10, 2026	Jun. 11, 2026	Mar. 12, 2026	Oct. 23, 2026	Sep. 30, 2026	Jun. 30, 2026	Mar. 31, 2026	Dec. 31, 2025	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025	Apr. 23, 2026	Dec. 11, 2025
Equity, Class of Treasury Stock [Line Items]
Common stock, dividends declared (in USD per share)						$ 1.17				$ 1.02	$ 3.21	$ 2.78
Dividends on common stock						$ 1,089				$ 987	$ 3,310	$ 2,986
Purchase price						2,434				$ 2,494	9,555	$ 7,475
2026 Stockholder Return Program
Equity, Class of Treasury Stock [Line Items]
Stock repurchase program, authorized amount													$ 18,200	$ 14,600
Common stock, dividends paid (in USD per share)		$ 1.02	$ 1.02	$ 1.02
Dividends on common stock						1,100					3,300
Dividends payable						$ 1,200					$ 1,200
Repurchases of common stock (in shares)						13,621,695					48,372,465
Average price paid per share (in USD per share)						$ 177.31					$ 195.81
Purchase price						$ 2,400					$ 9,500
Stock repurchase authorization amount						5,400					5,400
2026 Stockholder Return Program \| Subsequent Event
Equity, Class of Treasury Stock [Line Items]
Repurchases of common stock (in shares)					4,987,500
Average price paid per share (in USD per share)					$ 158.68
Purchase price					$ 791
Stock repurchase authorization amount					$ 4,600
2026 Stockholder Return Program \| DT
Equity, Class of Treasury Stock [Line Items]
Dividends on common stock						594					1,800
Dividends payable						$ 681					$ 681
2026 Stockholder Return Program \| Forecast
Equity, Class of Treasury Stock [Line Items]
Common stock, dividends paid (in USD per share)	$ 1.17
2026 Stockholder Return Program \| 2025 Q4 Dividends Declared
Equity, Class of Treasury Stock [Line Items]
Common stock, dividends declared (in USD per share)									$ 1.02
2026 Stockholder Return Program \| 2026 Q1 Dividends Declared
Equity, Class of Treasury Stock [Line Items]
Common stock, dividends declared (in USD per share)								$ 1.02
2026 Stockholder Return Program \| O 2026 Q2 Dividends
Equity, Class of Treasury Stock [Line Items]
Common stock, dividends declared (in USD per share)							$ 1.02
2026 Stockholder Return Program \| O 2026 Q3 Dividends
Equity, Class of Treasury Stock [Line Items]
Common stock, dividends declared (in USD per share)						$ 1.17

Restructuring Costs - Schedule of Activity Related to Reduction Initiative Expenses Incurred (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2026	Sep. 30, 2026
UScellular Acquisition Restructuring Initiatives
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance		$ 91
Expenses Incurred	$ 39	214
Cash Payments		(205)
Restructuring reserve, ending balance	100	100
Network Optimization Restructuring Initiatives
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance		1
Expenses Incurred	30	131
Cash Payments		(61)
Adjustments for Non-Cash Items		(13)
Restructuring reserve, ending balance	58	58
Contract termination costs \| UScellular Acquisition Restructuring Initiatives
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance		31
Expenses Incurred	19	111
Cash Payments		(99)
Restructuring reserve, ending balance	43	43
Contract termination costs \| Network Optimization Restructuring Initiatives
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance		0
Expenses Incurred	9	49
Cash Payments		(36)
Adjustments for Non-Cash Items		0
Restructuring reserve, ending balance	13	13
Severance costs \| UScellular Acquisition Restructuring Initiatives
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance		59
Expenses Incurred	9	66
Cash Payments		(70)
Restructuring reserve, ending balance	55	55
Network decommissioning \| UScellular Acquisition Restructuring Initiatives
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance		1
Expenses Incurred	11	37
Cash Payments		(36)
Restructuring reserve, ending balance	2	2
Network decommissioning \| Network Optimization Restructuring Initiatives
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance		1
Expenses Incurred	21	82
Cash Payments		(25)
Adjustments for Non-Cash Items		(13)
Restructuring reserve, ending balance	$ 45	$ 45

Receivables and Related Allowance for Credit Losses - Schedule of Write Offs Net of Recoveries (Details) $ in Millions	9 Months Ended
	Sep. 30, 2026 USD ($)
Write-offs
Originated in 2026	$ 175
Originated in 2025	388
Originated prior to 2025	93
Total	$ 656

Sales of Certain Receivables

9 Months Ended

Sep. 30, 2026

Transfers and Servicing [Abstract]

Sales of Certain Receivables

Note 5 – Sales of Certain Receivables

We regularly enter into transactions to sell certain service accounts receivable and EIP receivables. The transactions, including our continuing involvement with the sold receivables and the respective impacts to our condensed consolidated financial statements, are described below.

Sales of EIP Receivables

Overview of the Transaction

In 2015, we entered into an arrangement to sell certain EIP receivables on a revolving basis (the “EIP Sale Arrangement”), which will expire in November 2026. As of both September 30, 2026, and December 31, 2025, the EIP Sale Arrangement provided funding of $1.3 billion.

In connection with this EIP Sale Arrangement, we formed a wholly owned subsidiary, which qualifies as a bankruptcy remote entity (the “EIP BRE”). We consolidate the EIP BRE under the VIE model.

The following table summarizes the carrying amounts and classification of liabilities, which consist of the recourse guarantee, included on our Condensed Consolidated Balance Sheets with respect to the EIP BRE:


(in millions)	September 30, 2026		December 31, 2025

Other current liabilities	$	93	$	90
Other long-term liabilities	12		13

Sales of Service Accounts Receivable

Overview of the Transaction

In 2014, we entered into an arrangement to sell certain service accounts receivable on a revolving basis (the “Service Receivable Sale Arrangement”). On February 24, 2026, we extended the scheduled expiration date of the Service Receivable Sale Arrangement to February 23, 2027. As of both September 30, 2026, and December 31, 2025, the Service Receivable Sale Arrangement provided funding of $775 million.

In connection with the Service Receivable Sale Arrangement, we formed a wholly owned subsidiary, which qualifies as a bankruptcy remote entity, to sell service accounts receivable (the “Service BRE”). We consolidate the Service BRE under the VIE model.

The following table summarizes the carrying amounts and classification of liabilities included on our Condensed Consolidated Balance Sheets with respect to the Service BRE:


(in millions)	September 30, 2026		December 31, 2025

Other current liabilities	$	298	$	306

Sales of Receivables

The credit enhancement feature of each of the EIP Sale Arrangement and the Service Receivable Sale Arrangement is in the form of a recourse guarantee liability, which is collateralized by pledged but unsold receivables. The recourse guarantee represents a financial instrument that is primarily tied to the creditworthiness of our customers. At inception, we elected to measure the recourse guarantee liabilities at fair value with changes in fair value included in Selling, general and administrative expenses on our Condensed Consolidated Statements of Comprehensive Income. The fair value of the recourse guarantee liabilities is determined based on a discounted cash flow model, which primarily uses Level 3 inputs, including estimated customer default rates and creditworthiness, dilutions and recoveries. Our recourse guarantee liabilities related to the sales of service receivables and EIP receivables were $137 million and $130 million as of September 30, 2026, and December 31, 2025, respectively. These liabilities were collateralized by $301 million and $266 million of gross service receivables and $534 million and $535 million of gross EIP receivables pledged, but unsold as of September 30, 2026, and December 31, 2025, respectively, which represent our maximum exposure under the recourse guarantee.

The following table summarizes the impact of the sales of certain service receivables and EIP receivables on our Condensed Consolidated Balance Sheets:


(in millions)	September 30, 2026		December 31, 2025
Derecognized net service accounts receivable and EIP receivables	$	1,663	$	1,651


Other current liabilities	391		397
of which, recourse guarantee	125		117
Other long-term liabilities	12		13
of which, recourse guarantee	12		13
Net cash proceeds since inception	1,310		1,372
Of which:
Change in net cash proceeds during the year-to-date period	(62)		(96)
Net cash proceeds funded by reinvested collections	1,372		1,468

We recognized losses from sales of receivables, including changes in fair value of the recourse guarantee liabilities of $15 million and $17 million for the three months ended September 30, 2026 and 2025, respectively, and $52 million and $58

million for the nine months ended September 30, 2026 and 2025, respectively, in Selling, general and administrative expenses on our Condensed Consolidated Statements of Comprehensive Income.

Continuing Involvement

Pursuant to the EIP Sale Arrangement and Service Receivable Sale Arrangement described above, we have continuing involvement with the EIP receivables and service accounts receivable we sell, as we service the receivables, are required to replace certain receivables, including ineligible receivables, aged receivables and receivables where a write-off is imminent, and may be responsible for absorbing credit losses through performance under our recourse guarantee liabilities. We continue to service the customers and their related receivables, including facilitating customer payment collection, in exchange for a monthly servicing fee. As the receivables are sold on a revolving basis, the customer payment collections on sold receivables may be reinvested in new receivable sales. At the direction of the purchasers of the sold receivables, we apply the same policies and procedures while servicing the sold receivables as we apply to our owned receivables, and we continue to maintain normal relationships with our customers.

- Definition

The entire disclosure for a transferor's continuing involvement in financial assets that it has transferred in a securitization or asset-backed financing arrangement, the nature of any restrictions on assets reported by an entity in its statement of financial position that relate to a transferred financial asset (including the carrying amounts of such assets), how servicing assets and servicing liabilities are reported, and (for securitization or asset-backed financing arrangements accounted for as sales) when a transferor has continuing involvement with the transferred financial assets and transfers of financial assets accounted for as secured borrowings, how the transfer of financial assets affects an entity's financial position, financial performance, and cash flows.

+ References

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+ Details

Additional Financial Information

9 Months Ended

Sep. 30, 2026

Supplemental Financial Statement Elements [Abstract]

Additional Financial Information

Note 16 – Additional Financial Information

Accounts Payable and Accrued Liabilities

Accounts payable and accrued liabilities are summarized as follows:


(in millions)	September 30, 2026		December 31, 2025
Accounts payable	$	3,908	$	5,219
Property and other taxes, including payroll	1,782		1,601
Payroll and related benefits	1,209		1,709
Accrued interest	1,063		1,025




Other accrued liabilities	662		726
Accounts payable and accrued liabilities	$	8,624	$	10,280

Book overdrafts included in Accounts payable were $394 million and $823 million as of September 30, 2026 and December 31, 2025, respectively.

Supplemental Condensed Consolidated Statements of Cash Flows Information

The following table summarizes T-Mobile’s supplemental cash flow information:


	Three Months Ended September 30,				Nine Months Ended September 30,
(in millions)	2026		2025		2026		2025
Interest payments, net of amounts capitalized	$	946	$	997	$	3,119	$	2,923
Operating lease payments	1,302		1,269		4,142		3,685
Income tax payments, net of refunds received	7		63		774		415
Non-cash investing and financing activities



Change in accounts payable and accrued liabilities for purchases of property and equipment	$	51	$	136	$	(710)	$	(458)




Operating lease right-of-use assets obtained in exchange for lease obligations	582		1,064		1,647		2,138
Financing lease right-of-use assets obtained in exchange for lease obligations	340		324		1,050		1,002

Debt assumed in the UScellular Acquisition	—		1,653		—		1,653

Cash and Cash Equivalents, Including Restricted Cash

Cash and cash equivalents, including restricted cash, presented on our Condensed Consolidated Statements of Cash Flows were included on our Condensed Consolidated Balance Sheets as follows:


(in millions)	September 30, 2026		December 31, 2025
Cash and cash equivalents	$	5,620	$	5,598

Restricted cash (included in Other current assets)	321		296
Restricted cash (included in Other assets)	85		82
Cash and cash equivalents, including restricted cash	$	6,026	$	5,976

Receivables and Related Allowance for Credit Losses (Tables)

9 Months Ended

Sep. 30, 2026

Receivables [Abstract]

Schedule of Equipment Installment Plan Receivables

The following table summarizes the EIP receivables, including unamortized discounts and related allowance for credit losses:


(in millions)	September 30, 2026		December 31, 2025


EIP receivables, gross	$	7,909	$	8,626
Unamortized discount	(552)		(566)
EIP receivables, net of unamortized discount	7,357		8,060
Allowance for credit losses	(370)		(380)
EIP receivables, net of allowance for credit losses and unamortized discount	$	6,987	$	7,680
Classified on our condensed consolidated balance sheets as:
Equipment installment plan receivables, net of allowance for credit losses and unamortized discount	$	4,530	$	4,997
Equipment installment plan receivables due after one year, net of allowance for credit losses and unamortized discount	2,457		2,683
EIP receivables, net of allowance for credit losses and unamortized discount	$	6,987	$	7,680

Schedule of Equipment Installment Plan Receivables by Credit Category

The following table presents the amortized cost of our EIP receivables by delinquency status, customer credit class and year of origination as of September 30, 2026:


	Originated in 2026				Originated in 2025				Originated prior to 2025				Total EIP Receivables, Net of Unamortized Discount
(in millions)	Prime		Subprime		Prime		Subprime		Prime		Subprime		Prime		Subprime		Total
Current - 30 days past due	$	3,589	$	696	$	2,182	$	411	$	247	$	38	$	6,018	$	1,145	$	7,163
31 - 60 days past due	25		23		17		15		3		2		45		40		85
61 - 90 days past due	13		16		12		12		2		1		27		29		56
More than 90 days past due	11		13		11		13		3		2		25		28		53
EIP receivables, net of unamortized discount	$	3,638	$	748	$	2,222	$	451	$	255	$	43	$	6,115	$	1,242	$	7,357

Schedule of Write Offs Net of Recoveries

The following table presents write-offs of our EIP receivables by year of origination for the nine months ended September 30, 2026:


(in millions)	Originated in 2026		Originated in 2025		Originated prior to 2025		Total

Write-offs	$	175	$	388	$	93	$	656

Schedule of Unamortized Imputed Discount and Allowance for Credit Losses for Equipment Installment Plan Receivables

Activity for the nine months ended September 30, 2026 and 2025, in the allowance for credit losses and unamortized discount balances for the accounts receivable and EIP receivables segments was as follows:


	September 30, 2026						September 30, 2025
(in millions)	Accounts Receivable Allowance		EIP Receivables Allowance		Total		Accounts Receivable Allowance		EIP Receivables Allowance		Total
Allowance for credit losses and unamortized discount, beginning of period	$	226	$	946	$	1,172	$	176	$	814	$	990
Bad debt expense	615		646		1,261		478		447		925
Write-offs	(590)		(656)		(1,246)		(458)		(472)		(930)
Allowance for credit losses for acquired credit deteriorated receivables	—		—		—		10		78		88
Change in unamortized discount on short-term and long-term EIP receivables	N/A		127		127		N/A		100		100
Impact on the unamortized discount from sales of EIP receivables	N/A		(141)		(141)		N/A		(135)		(135)
Allowance for credit losses and unamortized discount, end of period	$	251	$	922	$	1,173	$	206	$	832	$	1,038

Business Combinations - Schedule of Fair Value of Assets Acquired and Liabilities Assumed UScellular Acquisition (Details) - USD ($) $ in Millions	Sep. 30, 2026	Dec. 31, 2025	Aug. 01, 2025	Feb. 03, 2025
Business Combination [Line Items]
Goodwill	$ 13,665	$ 13,678
UScellular Wireless Assets Operations
Business Combination [Line Items]
Cash and cash equivalents			$ 12
Accounts receivable			317
Equipment installment plan receivables			503
Inventory			129
Prepaid expenses			63
Other current assets			33
Property and equipment			1,451
Operating lease right-of-use assets			1,199
Goodwill			206
Equipment installment plan receivables due after one year			388
Deferred tax assets			23
Other assets			125
Total assets acquired			6,586
Accounts payable and accrued liabilities			295
Deferred revenue			275
Short-term operating lease liabilities			179
Other current liabilities			114
Long-term debt			1,653
Operating lease liabilities			1,029
Other long-term liabilities			227
Total liabilities assumed			3,772
Total consideration transferred			2,814
Short-term debt assumed for financing of property and equipment at fair value			1,700
UScellular Wireless Assets Operations \| Master License Agreement
Business Combination [Line Items]
Operating lease right-of-use assets			749
Short-term operating lease liabilities			51
Operating lease liabilities			698
UScellular Wireless Assets Operations \| Spectrum licenses
Business Combination [Line Items]
Intangible assets			1,730
UScellular Wireless Assets Operations \| Other intangible assets
Business Combination [Line Items]
Intangible assets			$ 407
Vistar Media Inc.
Business Combination [Line Items]
Cash and cash equivalents				$ 42
Accounts receivable				157
Prepaid expense and other current assets				2
Property and equipment				1
Operating lease right-of-use assets				1
Goodwill				341
Total assets acquired				808
Accounts payable and accrued liabilities				128
Deferred revenue				1
Deferred tax liabilities				59
Operating lease liabilities				2
Total liabilities assumed				190
Total consideration transferred				618
Vistar Media Inc. \| Other intangible assets
Business Combination [Line Items]
Intangible assets				$ 264

Tower Obligations (Tables)

9 Months Ended

Sep. 30, 2026

Leases [Abstract]

Schedule of Impacts to Consolidated Balance Sheets

The following table summarizes the balances associated with both of the tower arrangements on our Condensed Consolidated Balance Sheets:


(in millions)	September 30, 2026		December 31, 2025
Property and equipment, net	$	1,815	$	1,922
Tower obligations	3,419		3,532
Other long-term liabilities	554		554

Additional Financial Information (Tables)

9 Months Ended

Sep. 30, 2026

Supplemental Financial Statement Elements [Abstract]

Schedule of Accounts Payable and Accrued Liabilities

Accounts payable and accrued liabilities are summarized as follows:


(in millions)	September 30, 2026		December 31, 2025
Accounts payable	$	3,908	$	5,219
Property and other taxes, including payroll	1,782		1,601
Payroll and related benefits	1,209		1,709
Accrued interest	1,063		1,025




Other accrued liabilities	662		726
Accounts payable and accrued liabilities	$	8,624	$	10,280

Schedule of Supplemental Consolidated Statements of Cash Flows Information

The following table summarizes T-Mobile’s supplemental cash flow information:


	Three Months Ended September 30,				Nine Months Ended September 30,
(in millions)	2026		2025		2026		2025
Interest payments, net of amounts capitalized	$	946	$	997	$	3,119	$	2,923
Operating lease payments	1,302		1,269		4,142		3,685
Income tax payments, net of refunds received	7		63		774		415
Non-cash investing and financing activities



Change in accounts payable and accrued liabilities for purchases of property and equipment	$	51	$	136	$	(710)	$	(458)




Operating lease right-of-use assets obtained in exchange for lease obligations	582		1,064		1,647		2,138
Financing lease right-of-use assets obtained in exchange for lease obligations	340		324		1,050		1,002

Debt assumed in the UScellular Acquisition	—		1,653		—		1,653

Schedule of Cash and Cash Equivalents, Including Restricted Cash

Cash and cash equivalents, including restricted cash, presented on our Condensed Consolidated Statements of Cash Flows were included on our Condensed Consolidated Balance Sheets as follows:


(in millions)	September 30, 2026		December 31, 2025
Cash and cash equivalents	$	5,620	$	5,598

Restricted cash (included in Other current assets)	321		296
Restricted cash (included in Other assets)	85		82
Cash and cash equivalents, including restricted cash	$	6,026	$	5,976

Schedule of Restricted Cash

Cash and cash equivalents, including restricted cash, presented on our Condensed Consolidated Statements of Cash Flows were included on our Condensed Consolidated Balance Sheets as follows:


(in millions)	September 30, 2026		December 31, 2025
Cash and cash equivalents	$	5,620	$	5,598

Restricted cash (included in Other current assets)	321		296
Restricted cash (included in Other assets)	85		82
Cash and cash equivalents, including restricted cash	$	6,026	$	5,976

Segment Reporting (Tables)

9 Months Ended

Sep. 30, 2026

Segment Reporting [Abstract]

Schedule of Segment Reporting Information, by Segment

The following table provides the operating financial results of our Wireless segment:


	Three Months Ended September 30,				Nine Months Ended September 30,
(in millions)	2026		2025		2026		2025
Total revenues	$	23,584	$	21,957	$	69,482	$	63,975
Less: Significant and other segment expenses
Cost of equipment sales	5,444		4,853		15,987		14,310
Employee expenses	1,978		2,210		6,083		6,021
Lease expense	1,339		1,340		4,280		3,805
Advertising expense	956		906		2,783		2,582
Bad debt expense	437		337		1,261		925
Other segment items (1)	4,317		4,095		12,737		11,759
Impairment expense	—		278		—		278

Depreciation and amortization	3,452		3,408		10,703		9,752
Interest expense, net	1,031		924		3,117		2,762
Other expense, net	90		78		329		135
Income tax expense	1,085		814		3,004		2,757
Segment net income	$	3,455	$	2,714	$	9,198	$	8,889

(1)Other segment items included in Segment net income primarily include certain third-party commissions, external labor and services and backhaul expenses.

- Definition

Tabular disclosure of segment reporting. Includes, but is not limited to, reconciliation of reportable segment amount to corresponding consolidated total.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 31
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482810/280-10-50-31

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 280
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-Name Accounting Standards Codification
-Section 50
-Paragraph 34
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Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
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-Name Accounting Standards Codification
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-URI https://asc.fasb.org/1943274/2147482810/280-10-50-32

Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef
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-SubTopic 10
-Name Accounting Standards Codification
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-Paragraph 30
-Publisher FASB
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Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef
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Reference 6: http://www.xbrl.org/2009/role/commonPracticeRef
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Reference 7: http://www.xbrl.org/2009/role/commonPracticeRef
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Reference 8: http://www.xbrl.org/2009/role/commonPracticeRef
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Reference 9: http://www.xbrl.org/2009/role/commonPracticeRef
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Reference 10: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 280
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-Name Accounting Standards Codification
-Section 50
-Paragraph 15
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482810/280-10-50-15

+ Details

Revenue from Contracts with Customers (Tables)

9 Months Ended

Sep. 30, 2026

Revenue from Contract with Customer [Abstract]

Schedule of Contract Liability and Receivable Balances

The contract asset and contract liability balances from contracts with customers as of September 30, 2026 and December 31, 2025, were as follows:


(in millions)	Contract Assets		Contract Liabilities

Balance as of December 31, 2025	$	1,307	$	1,653
Balance as of September 30, 2026	1,449		1,457

Change	$	142	$	(196)

Revenues for the three and nine months ended September 30, 2026 and 2025, include the following:


	Three Months Ended September 30,				Nine Months Ended September 30,
(in millions)	2026		2025		2026		2025
Amounts included in the beginning of year contract liability balance	$	140	$	77	$	1,406	$	1,127

Restructuring Costs - Schedule of Workforce Reduction Incurred and Cash Payments Made (Details) - 2025-2026 Workforce Transformation - Severance costs - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2026	Sep. 30, 2026
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance		$ 374
Expenses Incurred	$ 0	141
Cash Payments		(462)
Restructuring reserve, ending balance	$ 53	$ 53

- Definition

Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

+ References + Details

Summary of Significant Accounting Policies	9 Months Ended
Summary of Significant Accounting Policies	Sep. 30, 2026
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Note 1 – Summary of Significant Accounting Policies Basis of Presentation The unaudited condensed consolidated financial statements of T-Mobile US, Inc. (“T-Mobile,” “we,” “our,” “us” or the “Company”) include all adjustments of a normal recurring nature necessary for the fair presentation of the results for the interim periods presented. The results for the interim periods are not necessarily indicative of those for the full year. The condensed consolidated financial statements should be read in conjunction with our consolidated financial statements included in our Annual Report on Form 10-K for the year ended December 31, 2025. The condensed consolidated financial statements include the balances and results of operations of T-Mobile and our consolidated subsidiaries. We consolidate majority-owned subsidiaries over which we exercise control, variable interest entities (“VIEs”) for which we are deemed to be the primary beneficiary and VIEs which cannot be deconsolidated, such as those related to our tower obligations as discussed in Note 9 – Tower Obligations. Intercompany transactions and balances have been eliminated in consolidation. Investments in entities that we do not control but have significant influence are accounted for under the equity method. We record our proportionate share of our equity method investees’ earnings (losses) within Other expense, net on our Condensed Consolidated Statements of Comprehensive Income. The preparation of financial statements in conformity with United States (“U.S.”) generally accepted accounting principles (“GAAP”) requires our management to make estimates and assumptions that affect the financial statements and accompanying notes. Estimates are based on historical experience, where applicable, and other assumptions that management believes are reasonable under the circumstances. Estimates are inherently subject to judgment and actual results could differ from those estimates. Accounting Pronouncements Adopted During the Current Year Interim Reporting In December 2025, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2025-11, “Interim Reporting (Topic 270): Narrow-Scope Improvements.” The standard improves the navigability of interim disclosures, clarifies when Topic 270 applies and provides additional interim disclosure guidance, including a principle to disclose material events since the most recent annual reporting period. The amendments do not change the underlying objectives of interim reporting but are designed to enhance clarity in application. We evaluated this standard and concluded our interim reporting disclosures are consistent with this standard. Accordingly, the adoption of this standard in the first quarter of 2026 did not have a material impact on our interim reporting disclosures. Internal-Use Software Accounting and Disclosures In September 2025, the FASB issued ASU 2025-06, “Intangibles—Goodwill and Other—Internal-Use Software (Subtopic 350-40): Targeted Improvements to the Accounting for Internal-Use Software.” The amendments remove all references to project stages in ASC 350-40, clarify the threshold entities apply to begin capitalizing costs and address challenges arising from the evolution of software development practices. The new guidance modernizes accounting for software developed using incremental and iterative methods, where the existing model provided limited direction on when capitalization should begin. The ASU also specifies that the disclosures under ASC 360-10, “Property, Plant, and Equipment—Overall,” apply to capitalized software costs accounted for under ASC 350-40, regardless of how those costs are presented in the financial statements. As of January 1, 2026, we have adopted this standard, and it was applied prospectively after this date. The adoption of this standard did not have a material impact on our condensed consolidated financial statements and related disclosures. Accounting Pronouncements Not Yet Adopted Disaggregation of Income Statement Expenses In November 2024, the FASB issued ASU 2024-03, “Income Statement—Reporting Comprehensive Income—Expense Disaggregation Disclosures (Subtopic 220-40): Disaggregation of Income Statement Expenses.” The standard requires that public business entities disclose additional information about specific expense categories in the notes to financial statements for interim and annual reporting periods. The standard will become effective for us for our fiscal year 2027 annual financial statements and interim financial statements thereafter and may be applied prospectively to periods after the adoption date or retrospectively for all prior periods presented in the financial statements, with early adoption permitted. We plan to adopt the standard when it becomes effective for us beginning in our fiscal year 2027 annual financial statements, and we are currently evaluating the impact this guidance will have on the disclosures included in the Notes to the Consolidated Financial Statements.

Spectrum License Transactions (Tables)

9 Months Ended

Sep. 30, 2026

Intangible Asset, Goodwill and Other [Abstract]

Schedule of Spectrum Licenses

The following table summarizes our spectrum license activity for the nine months ended September 30, 2026:


(in millions)	Spectrum
Spectrum licenses, beginning of year	$	98,032

Spectrum license acquisitions	2,478

Spectrum licenses transferred to held for sale	(530)


Spectrum licenses, end of period	$	99,980

Business Combinations - Narrative (Details) $ in Millions											3 Months Ended		9 Months Ended
Business Combinations - Narrative (Details) $ in Millions	Oct. 09, 2026 USD ($) shares	Aug. 05, 2025 USD ($)	Aug. 01, 2025 USD ($)	Jul. 22, 2025 USD ($) agreement	Jun. 30, 2025 USD ($)	Mar. 03, 2025 USD ($)	Feb. 18, 2025 USD ($)	Feb. 03, 2025 USD ($)	May 24, 2024 USD ($)	Mar. 09, 2023 USD ($)	Sep. 30, 2026 USD ($)	Sep. 30, 2025 USD ($)	Sep. 30, 2026 USD ($)	Sep. 30, 2025 USD ($)	Dec. 31, 2025 USD ($)	Dec. 20, 2024
Business Combination [Line Items]
Short-term debt assumed for financing of property and equipment											$ 0	$ 1,653	$ 0	$ 1,653
Goodwill											13,665		13,665		$ 13,678
Ka Ena Corporation \| Subsequent Event
Business Combination [Line Items]
Additional upfront payment to be paid	$ 420
Business acquisition, cash transferred for earnout obligation	$ 164
Business acquisition, equity transferred for earnout obligation (in shares) \| shares	1,510,371
Shares withheld associated with tax obligations (in shares) \| shares	102,164
Ka Ena Corporation \| Merger And Unit Purchase Agreement
Business Combination [Line Items]
Business acquisition, outstanding (percent)										100.00%
Total consideration transferred					$ 1,350					$ 1,350
Business acquisition, cash acquired (percent)										39.00%
Business acquisition, common shares acquired (percent)										61.00%
Ka Ena Corporation \| Merger and Unit Purchase Agreement, Amendment No. 1
Business Combination [Line Items]
Additional upfront payment to be paid					420
Business combination, potential earnout payment					251
Business combination, potential earnout payment for services					$ 169
Liabilities for deferred consideration											251		251		242
Liabilities for post-acquisition											$ 169		$ 169		$ 157
UScellular Wireless Assets Operations
Business Combination [Line Items]
Total consideration transferred			$ 2,814
Business acquisition, cash transferred			2,770
Short-term debt assumed for financing of property and equipment		$ 1,700
Short-term debt assumed for financing of property and equipment at fair value			1,700
Goodwill			206
Goodwill expected to be tax deductible			181
Total liabilities assumed			3,772
UScellular Wireless Assets Operations \| Purchase Agreement
Business Combination [Line Items]
Payments for asset acquisition									$ 4,400
Asset acquisition, maximum transferred liabilities incurred									$ 2,000
Business acquisition, cash transferred			$ 2,800
Farmers Cellular Telephone Company Acquisition \| Purchase Agreement
Business Combination [Line Items]
Number of separate asset purchase agreements \| agreement				3
Business acquisition, cash transferred				$ 175
Vistar Media Inc.
Business Combination [Line Items]
Business acquisition, outstanding (percent)																100.00%
Goodwill								$ 341
Total consideration transferred, including settlements of preexisting relationships								621
Total liabilities assumed								$ 190
Blis Holdco Limited
Business Combination [Line Items]
Business acquisition, outstanding (percent)							100.00%
Total consideration transferred							$ 174
Business acquisition, cash transferred						$ 180
Goodwill							103
Total assets acquired, including goodwill							263
Total liabilities assumed							$ 89

Receivables and Related Allowance for Credit Losses - Schedule of Equipment Installment Plan Receivables (Details) - USD ($) $ in Millions	Sep. 30, 2026	Dec. 31, 2025
Accounts, Notes, Loans and Financing Receivable [Line Items]
EIP receivables, gross	$ 7,909	$ 8,626
Unamortized discount	(552)	(566)
EIP receivables, net of unamortized discount	7,357	8,060
Allowance for credit losses	(370)	(380)
EIP receivables, net of allowance for credit losses and unamortized discount	6,987	7,680
Balance Sheet Location [Axis]: us-gaap:NotesAndLoansReceivableNetCurrent
Accounts, Notes, Loans and Financing Receivable [Line Items]
EIP receivables, net of allowance for credit losses and unamortized discount	4,530	4,997
Balance Sheet Location [Axis]: us-gaap:NotesAndLoansReceivableNetNoncurrent
Accounts, Notes, Loans and Financing Receivable [Line Items]
EIP receivables, net of allowance for credit losses and unamortized discount	$ 2,457	$ 2,683

- Definition

Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement.

+ References

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Amortized cost, before allowance for credit loss, of financing receivable. Excludes financing receivable covered under loss sharing agreement and net investment in lease.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

Amortized cost, after allowance for credit loss, of financing receivable. Excludes financing receivable covered under loss sharing agreement and net investment in lease.

+ References + Details

Business Combinations (Tables)

9 Months Ended

Sep. 30, 2026

Business Combination, Asset Acquisition, Transaction between Entities under Common Control, and Joint Venture Formation [Abstract]

Business Combination

The acquisition-date fair value of consideration transferred in the UScellular Acquisition is comprised of the following:


(in millions)	August 1, 2025
Fair value of cash paid on the UScellular Acquisition Date, as adjusted	$	2,770
Fair value of T-Mobile replacement equity awards attributable to pre-combination service	44
Total fair value of consideration exchanged	$	2,814

Schedule of Fair Value of Assets Acquired and Liabilities Assumed

The following table summarizes the assigned fair values for each class of assets acquired and liabilities assumed at the UScellular Acquisition Date, including immaterial adjustments based on information identified during the measurement period, which closed on July 31, 2026. We retained the services of certified valuation specialists to assist with assigning values to certain acquired assets and liabilities assumed.


(in millions)	August 1, 2025
Cash and cash equivalents	$	12
Accounts receivable	317
Equipment installment plan receivables	503
Inventory	129
Prepaid expenses	63
Other current assets	33
Property and equipment	1,451
Operating lease right-of-use assets (1)	1,199
Goodwill	206
Spectrum licenses	1,730
Other intangible assets	407
Equipment installment plan receivables due after one year	388
Deferred tax assets	23
Other assets	125
Total assets acquired	6,586
Accounts payable and accrued liabilities	295
Deferred revenue	275
Short-term operating lease liabilities (1)	179
Other current liabilities	114
Long-term debt (2)	1,653
Operating lease liabilities (1)	1,029
Other long-term liabilities	227
Total liabilities assumed	3,772
Total consideration transferred	$	2,814

(1)Includes $749 million, $51 million and $698 million of Operating lease right-of-use assets, Short-term operating lease liabilities and Operating lease liabilities, respectively, for towers associated with the UScellular master license agreement where we were not leasing tower space prior to the UScellular Acquisition Date.

(2)The obligation to execute the Exchange Offers was recorded as debt assumed in the UScellular Acquisition with an aggregate assigned fair value of $1.7 billion.

The following table summarizes the assigned fair values for each class of assets acquired and liabilities assumed at the Vistar Acquisition Date, including immaterial adjustments based on information identified during the measurement period, which closed on February 2, 2026.


(in millions)	February 3, 2025
Cash and cash equivalents	$	42
Accounts receivable	157


Prepaid expense and other current assets	2
Property and equipment	1
Operating lease right-of-use assets	1
Goodwill	341
Other intangible assets	264

Total assets acquired	808
Accounts payable and accrued liabilities	128
Deferred revenue	1
Deferred tax liabilities	59
Operating lease liabilities	2

Total liabilities assumed	190
Total consideration transferred	$	618

- Definition

Tabular disclosure of business combination. Includes, but is not limited to, recognized asset and liability.

+ References + Details

Debt - Schedule of Maturities of ABS Notes (Details) - ABS Notes $ in Millions	Sep. 30, 2026 USD ($)
Debt Instrument [Line Items]
2026	$ 136
2027	1,008
2028	985
2029	371
Total debt	$ 2,500

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

+ Details

- Definition

Amount, after deduction of unamortized premium (discount) and debt issuance cost, of long-term debt. Excludes lease obligation.

+ References

+ Details

Revenue from Contracts with Customers - Narrative (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2026 USD ($) customer_category	Sep. 30, 2025 USD ($)	Sep. 30, 2026 USD ($) customer_category	Sep. 30, 2025 USD ($)	Dec. 31, 2025 USD ($)
Disaggregation of Revenue [Line Items]
Number of customer categories \| customer_category	2		2
Current portion of contract assets	$ 1,100,000,000		$ 1,100,000,000		$ 920,000,000
Deferred incremental costs to obtain contracts	2,100,000,000		2,100,000,000		$ 2,000,000,000.0
Amortization of deferred costs	487,000,000	$ 474,000,000	1,400,000,000	$ 1,400,000,000
Impairment losses recognized on deferred contract cost assets	$ 0	$ 0	$ 0	$ 0
Minimum
Disaggregation of Revenue [Line Items]
Remaining contract duration (in years)			1 year
Average amortization period, deferred contract costs (in months)	24 months		24 months
Maximum
Disaggregation of Revenue [Line Items]
Remaining contract duration (in years)			7 years
Average amortization period, deferred contract costs (in months)	36 months		36 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-10-01
Disaggregation of Revenue [Line Items]
Remaining performance obligation	$ 314,000,000		$ 314,000,000
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2027-01-01
Disaggregation of Revenue [Line Items]
Remaining performance obligation	920,000,000		920,000,000
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2028-01-01
Disaggregation of Revenue [Line Items]
Remaining performance obligation	2,600,000,000		2,600,000,000
Postpaid revenues
Disaggregation of Revenue [Line Items]
Remaining performance obligation	$ 3,100,000,000		$ 3,100,000,000
Postpaid revenues \| Minimum
Disaggregation of Revenue [Line Items]
Remaining contract duration (in years)			24 months
Postpaid revenues \| Maximum
Disaggregation of Revenue [Line Items]
Remaining contract duration (in years)			36 months

Restructuring Costs

9 Months Ended

Sep. 30, 2026

Restructuring and Related Activities [Abstract]

Restructuring Costs

Note 15 – Restructuring Costs

UScellular Acquisition Restructuring Initiatives

Upon completing the UScellular Acquisition on August 1, 2025, we began implementing restructuring initiatives to realize cost efficiencies and eliminate redundancies. The major activities associated with the UScellular Acquisition restructuring initiatives include contract termination costs associated with the rationalization of retail stores, distribution channels, duplicative network and backhaul services and other agreements, severance costs associated with the integration of redundant processes and functions and the decommissioning of certain cell sites and distributed antenna systems to achieve synergies in network costs.

The following table summarizes the restructuring expenses incurred in connection with our UScellular Acquisition restructuring initiatives:



(in millions)	Three Months Ended September 30, 2026		Nine Months Ended September 30, 2026		Incurred to Date
Contract termination costs	$	19	$	111	$	143
Severance costs	9		66		129
Network decommissioning	11		37		53
Total restructuring plan expenses	$	39	$	214	$	325

The restructuring expenses associated with our UScellular Acquisition restructuring initiatives are included in Cost of services and Selling, general and administrative expenses on our Condensed Consolidated Statements of Comprehensive Income.

Our UScellular Acquisition restructuring initiatives also include the acceleration or termination of certain of our operating leases for cell sites, switch sites and retail stores. Incremental expenses associated with terminated leases and leases for which we have recognized accelerated lease expense were $10 million and $321 million for the three and nine months ended September 30, 2026, respectively, compared to no accelerated lease expenses incurred during the three and nine months ended September 30, 2025. These expenses are included in Cost of services and Selling, general and administrative expenses on our Condensed Consolidated Statements of Comprehensive Income.

Additionally, we recognized $242 million of accelerated depreciation for the nine months ended September 30, 2026, primarily related to assets associated with the decommissioning of cell sites, compared to no accelerated depreciation incurred during the three months ended September 30, 2026 and 2025, and the nine months ended September 30, 2025. These expenses are included in Depreciation and amortization on our Condensed Consolidated Statements of Comprehensive Income.

The changes in the liabilities associated with our UScellular Acquisition restructuring initiatives, including restructuring expenses incurred and cash payments, are as follows:


(in millions)	December 31, 2025		Expenses Incurred		Cash Payments		September 30, 2026
Contract termination costs	$	31	$	111	$	(99)	$	43
Severance costs	59		66		(70)		55
Network decommissioning	1		37		(36)		2
Total	$	91	$	214	$	(205)	$	100

The liabilities accrued in connection with our UScellular Acquisition restructuring initiatives are presented in Accounts payable and accrued liabilities on our Condensed Consolidated Balance Sheets.

We expect to incur substantially all costs related to our UScellular Acquisition restructuring activities by the end of fiscal year 2027. We are evaluating additional restructuring initiatives associated with the UScellular Acquisition, which are dependent on consultations and negotiations with certain counterparties and the expected impact on our business operations, which could affect the amount or timing of the restructuring costs and related payments.

Network Restructuring Initiative

Recent technological advancements have enhanced our Customer-Driven Coverage insights, enabling us to identify, assess and

shut down low customer value sites. In the fourth quarter of 2025, we began implementing restructuring initiatives to identify and realize these cost savings on our network, excluding activities associated with the UScellular Acquisition (the “Network Restructuring Initiative”). The major activities associated with the Network Restructuring Initiative include the rationalization of network and backhaul services and the decommissioning of cell sites and distributed antenna systems to reduce our overall network cost.

The following table summarizes the restructuring expenses incurred in connection with our Network Restructuring Initiative:



(in millions)	Three Months Ended September 30, 2026		Nine Months Ended September 30, 2026		Incurred to Date
Contract termination costs	$	9	$	49	$	54
Network decommissioning	21		82		146
Total restructuring plan expenses	$	30	$	131	$	200

The restructuring expenses associated with our Network Restructuring Initiative are included in Cost of services on our Condensed Consolidated Statements of Comprehensive Income.

The changes in the liabilities associated with our Network Restructuring Initiative, including restructuring expenses incurred and cash payments, are as follows:


(in millions)	December 31, 2025		Expenses Incurred		Cash Payments		Adjustments for Non-Cash Items (1)		September 30, 2026
Contract termination costs	$	—	$	49	$	(36)	$	—	$	13
Network decommissioning	1		82		(25)		(13)		45
Total	$	1	$	131	$	(61)	$	(13)	$	58

(1) Non-cash items primarily consist of the write-off of assets within Network decommissioning.

The liabilities accrued in connection with our Network Restructuring Initiative are presented in Accounts payable and accrued liabilities on our Condensed Consolidated Balance Sheets.

Our Network Restructuring Initiative is expected to be completed prior to the end of 2027. We are evaluating additional restructuring activities associated with the Network Restructuring Initiative, which are dependent on consultations and negotiations with certain counterparties and the expected impact on our business operations, which could affect the amount or timing of the restructuring costs and related payments.

2025-2026 Workforce Transformation

In the fourth quarter of 2025, we began implementing a restructuring initiative to streamline operations by centralizing leaders and teams, reducing organizational layers and eliminating duplicative roles (the “2025-2026 Workforce Transformation”).

The following table summarizes the restructuring expenses incurred in connection with our 2025-2026 Workforce Transformation initiative:



(in millions)	Three Months Ended September 30, 2026		Nine Months Ended September 30, 2026		Incurred to Date
Severance costs	$	—	$	141	$	531

The restructuring expenses associated with our 2025-2026 Workforce Transformation initiative are included in Cost of services and Selling, general and administrative expenses on our Condensed Consolidated Statements of Comprehensive Income.

The changes in the liabilities associated with our 2025-2026 Workforce Transformation initiative, including restructuring expenses incurred and cash payments, are as follows:


(in millions)	December 31, 2025		Expenses Incurred		Cash Payments		September 30, 2026
Severance costs	$	374	$	141	$	(462)	$	53

The liabilities accrued in connection with our 2025-2026 Workforce Transformation initiative are presented in Accounts payable and accrued liabilities on our Condensed Consolidated Balance Sheets.

We have incurred substantially all of the costs associated with our 2025-2026 Workforce Transformation. We expect substantially all remaining associated employee separations and related cash outflows to occur throughout 2026.

Retail Initiatives

In connection with our ongoing digital initiatives to simplify routine transactions, as well as enhance customer experiences by transitioning in part to large-format experience stores, we began closing certain dealer- and corporate-owned stores in the second quarter of 2026. Costs associated with the closure of stores acquired in the UScellular Acquisition are included within UScellular Acquisition restructuring initiatives.

Restructuring expenses incurred in connection with these retail initiatives include contract termination, severance and store decommissioning costs. During the three and nine months ended September 30, 2026, we recorded a pre-tax charge of $31 million and $133 million, respectively, related to these retail initiatives, which is included in Selling, general and administrative expenses on our Condensed Consolidated Statements of Comprehensive Income. Our liabilities associated with our retail initiatives as of September 30, 2026, were $40 million and are presented in Accounts payable and accrued liabilities on our Condensed Consolidated Balance Sheets.

We are evaluating additional restructuring activities associated with our retail initiatives, which are dependent on negotiations with certain counterparties and the expected impact on our business operations.

Restructuring Costs (Tables)

9 Months Ended

Sep. 30, 2026

Restructuring and Related Activities [Abstract]

Schedule of Restructuring Plan Expenses Incurred

The following table summarizes the restructuring expenses incurred in connection with our UScellular Acquisition restructuring initiatives:



(in millions)	Three Months Ended September 30, 2026		Nine Months Ended September 30, 2026		Incurred to Date
Contract termination costs	$	19	$	111	$	143
Severance costs	9		66		129
Network decommissioning	11		37		53
Total restructuring plan expenses	$	39	$	214	$	325

The following table summarizes the restructuring expenses incurred in connection with our Network Restructuring Initiative:



(in millions)	Three Months Ended September 30, 2026		Nine Months Ended September 30, 2026		Incurred to Date
Contract termination costs	$	9	$	49	$	54
Network decommissioning	21		82		146
Total restructuring plan expenses	$	30	$	131	$	200

Schedule of Activity Related to Expenses Incurred and Cash Payments Made

The changes in the liabilities associated with our UScellular Acquisition restructuring initiatives, including restructuring expenses incurred and cash payments, are as follows:


(in millions)	December 31, 2025		Expenses Incurred		Cash Payments		September 30, 2026
Contract termination costs	$	31	$	111	$	(99)	$	43
Severance costs	59		66		(70)		55
Network decommissioning	1		37		(36)		2
Total	$	91	$	214	$	(205)	$	100

The changes in the liabilities associated with our Network Restructuring Initiative, including restructuring expenses incurred and cash payments, are as follows:


(in millions)	December 31, 2025		Expenses Incurred		Cash Payments		Adjustments for Non-Cash Items (1)		September 30, 2026
Contract termination costs	$	—	$	49	$	(36)	$	—	$	13
Network decommissioning	1		82		(25)		(13)		45
Total	$	1	$	131	$	(61)	$	(13)	$	58

(1) Non-cash items primarily consist of the write-off of assets within Network decommissioning.

The following table summarizes the restructuring expenses incurred in connection with our 2025-2026 Workforce Transformation initiative:



(in millions)	Three Months Ended September 30, 2026		Nine Months Ended September 30, 2026		Incurred to Date
Severance costs	$	—	$	141	$	531

The changes in the liabilities associated with our 2025-2026 Workforce Transformation initiative, including restructuring expenses incurred and cash payments, are as follows:


(in millions)	December 31, 2025		Expenses Incurred		Cash Payments		September 30, 2026
Severance costs	$	374	$	141	$	(462)	$	53

Tower Obligations - Narrative (Details) $ in Millions			12 Months Ended
Tower Obligations - Narrative (Details) $ in Millions	Jan. 03, 2022 USD ($)	Apr. 01, 2020 USD ($) tower_site renewal_option	Dec. 31, 2012 USD ($) tower_site	Sep. 30, 2026 USD ($) tower_site
Sale Leaseback Transaction [Line Items]
Number of renewal options \| renewal_option		0
Tower obligation payments, due next year				$ 396
Tower obligation payments, due within two and three years				829
Tower obligation payment, due within four and five years				883
Tower obligation payments due thereafter				$ 2,900
Tower Transaction
Sale Leaseback Transaction [Line Items]
Lessee leasing arrangements, operating leases, term of contract (years)	12 years
Sale leaseback transaction, fixed-price purchase options			$ 2,000
Interest rate on tower obligations	11.60%
Tower Transaction \| Tower
Sale Leaseback Transaction [Line Items]
Useful life (years)				20 years
Tower Transaction \| Minimum
Sale Leaseback Transaction [Line Items]
Lessee leasing arrangements, operating leases, term of contract (years)			23 years
Tower Transaction \| Maximum
Sale Leaseback Transaction [Line Items]
Lessee leasing arrangements, operating leases, term of contract (years)			37 years
CCI Tower Lease Arrangement \| Crown Castle International Corp.
Sale Leaseback Transaction [Line Items]
Interest rate on tower obligations	5.30%
Crown Castle International Corp.
Sale Leaseback Transaction [Line Items]
Increase to deferred tax liabilities	$ 1,200
Managed sites \| tower_site				850
Lease liability				$ 233
Crown Castle International Corp. \| Tower Transaction
Sale Leaseback Transaction [Line Items]
Property subject to failed sale leaseback transaction, number of units \| tower_site		6,400	6,200
Remaining term of lease		17 years
Fixed-price purchase option on leased or subleased sites		$ 2,300
Fixed-price purchase option on lease or subleased sites, exercisable period		1 year
Days prior to expiration of agreement		120 days

Sales of Certain Receivables - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025	Dec. 31, 2025
Variable Interest Entity [Line Items]
Losses from sales of receivables	$ 15	$ 17	$ 52	$ 58
EIP Securitization Arrangement
Variable Interest Entity [Line Items]
Revolving receivables facility, maximum borrowing capacity	1,300		1,300		$ 1,300
Factoring Arrangement \| Collateral Pledged \| Service Receivable Sale Arrangement
Variable Interest Entity [Line Items]
Gross receivables	301		301		266
Factoring Arrangement \| Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Revolving receivables facility, outstanding borrowings	775		775		775
Factoring and EIP Securitization Arrangement
Variable Interest Entity [Line Items]
Losses from sales of receivables	15	$ 17	52	$ 58
Factoring and EIP Securitization Arrangement \| Collateral Pledged \| EIP Sale Arrangement
Variable Interest Entity [Line Items]
Gross EIP receivables	534		534		535
Factoring and EIP Securitization Arrangement \| Level 3 \| Carrying Amount
Variable Interest Entity [Line Items]
Carrying amounts of deferred purchase price assets	$ 137		$ 137		$ 130

Debt

9 Months Ended

Sep. 30, 2026

Debt Disclosure [Abstract]

Debt

Note 8 – Debt

The following table sets forth the debt balances and activity as of, and for the nine months ended, September 30, 2026:


(in millions)	December 31, 2025		Proceeds from Issuances and Borrowings		Redemptions, Repayments, and Repurchases (1)		Reclassifications (1)		Other (2)		September 30, 2026
Short-term debt	$	5,135	$	—	$	(4,962)	$	6,167	$	3	$	6,343
Long-term debt	79,649		6,891		(2,715)		(6,167)		(335)		77,323
Total debt to third parties	84,784		6,891		(7,677)		—		(332)		83,666

Long-term debt to affiliates	1,498		—		(1,498)		—		—		—
Total debt	$	86,282	$	6,891	$	(9,175)	$	—	$	(332)	$	83,666

(1)Note redemptions, repurchases and reclassifications are recorded net of accrued or paid issuance costs and discounts.

(2)Other includes the amortization of premiums, discounts, debt issuance costs and consent fees and the impact from changes in foreign currency exchange rates.

Our effective interest rate, excluding the impact of derivatives and capitalized interest, was 4.3% and 4.2% on weighted-average debt outstanding of $84.4 billion and $83.2 billion for the three months ended September 30, 2026 and 2025, respectively, and 4.3% and 4.1% on weighted-average debt outstanding of $85.4 billion and $82.1 billion for the nine months ended September 30, 2026 and 2025, respectively. The weighted-average debt outstanding was calculated by applying an average of the monthly ending balances of total short-term and long-term debt to third parties and short-term and long-term debt to affiliates, net of unamortized premiums, discounts, debt issuance costs and consent fees.

Issuances and Borrowings

During the nine months ended September 30, 2026, we issued and borrowed the following debt:


(in millions)	Principal Issuances		Discounts and Issuance Costs		Net Proceeds from Issuance of Debt		Issue Date
5.000% Senior Notes due 2036	$	1,150	$	(8)	$	1,142	January 12, 2026
5.850% Senior Notes due 2056	850		(8)		842		January 12, 2026
3.200% Senior Notes due 2032 (EUR-denominated)	881		(5)		876		February 19, 2026
3.625% Senior Notes due 2035 (EUR-denominated)	881		(5)		876		February 19, 2026
3.900% Senior Notes due 2038 (EUR-denominated)	1,175		(12)		1,163		February 19, 2026
Total of Senior Notes issued	4,937		(38)		4,899
4.250% Class A Senior ABS Notes due 2030	500		(2)		498		March 20, 2026
4.740% Class A Senior ABS Notes due 2031	500		(2)		498		August 14, 2026
Total of ABS Notes issued	1,000		(4)		996


4.557% MRFA due 2027	1,000		(4)		996		February 5, 2026
Total borrowings	1,000		(4)		996
Total issuances and borrowings	$	6,937	$	(46)	$	6,891

Redemptions, Repayments and Repurchases

During the nine months ended September 30, 2026, we made the following redemptions, repayments and repurchases:


(in millions)	Principal Amount		Write-off of Premium, Discount, Fees and Repurchase Gains / Losses (1)		Redemption, Repayment or Repurchase Date	Redemption or Repurchase Price
4.750% Senior Notes due 2028	$	1,500	$	3	February 1, 2026	100		%
4.750% Senior Notes to affiliates due 2028	1,500		2		February 1, 2026	100		%
1.500% Senior Notes due 2026	1,000		—		February 15, 2026	N/A
2.250% Senior Notes due 2026	1,800		—		February 15, 2026	N/A
5.050% Class A Senior ABS Notes due 2029	500		—		March 20, 2026	100		%
2.625% Senior Notes due 2026	1,200		—		April 15, 2026	N/A
Total redemptions	7,500		5

ECA Facility due March 2036	87		—		Various	N/A
5.152% Series 2018-1 A-2 Notes due 2028	275		—		Various	N/A
ECA Facility due November 2036	44		—		Various	N/A
Total repayments	406		—

Open market repurchases of our various Senior Notes (2)	1,259		(26)		Various	$	1,249
Total repurchases	1,259		(26)
Total redemptions, repayments and repurchases	$	9,165	$	(21)

(1)Write-off of issuance costs and consent fees are included in Other expense, net on our Condensed Consolidated Statements of Comprehensive Income. Write-off of issuance costs and consent fees are included in Other, net within Net cash provided by operating activities on our Condensed Consolidated Statements of Cash Flows.

(2)Gains and losses associated with open market repurchases are included within Other expense, net on our Condensed Consolidated Statements of Comprehensive Income. Payments associated with principal repurchases are included in Repayments of long-term debt, and repurchase premiums and fees to extinguish debt are included in Other, net within Net cash used in financing activities on our Condensed Consolidated Statements of Cash Flows.

Asset-backed Notes

As of September 30, 2026, $2.5 billion of our ABS Notes were secured in total by $3.3 billion of gross EIP receivables and future collections on such receivables. Our ABS Notes and the assets securing this debt are included on our Condensed Consolidated Balance Sheets.

The expected maturities of our ABS Notes as of September 30, 2026, were as follows:


(in millions)	Expected Maturities
2026	$	136
2027	1,008
2028	985
2029	371
Total	$	2,500

Variable Interest Entities

In connection with our ABS Notes issuances, we formed a wholly owned subsidiary, which qualifies as a bankruptcy remote entity (the “ABS BRE”), and a trust (the “ABS Trust” and together with the ABS BRE, the “ABS Entities”) in which the ABS BRE holds a residual interest. Each of the ABS Entities meets the definition of a VIE for which we have determined that we are the primary beneficiary, as we have the power to direct the activities of the ABS Entities that most significantly impact their performance. Accordingly, we include the balances and results of operations of the ABS Entities on our condensed consolidated financial statements.

The following table summarizes the carrying amounts and classification of assets and liabilities included on our Condensed Consolidated Balance Sheets with respect to the ABS Entities:


(in millions)	September 30, 2026		December 31, 2025

Assets
Equipment installment plan receivables, net	$	2,203	$	1,865
Equipment installment plan receivables due after one year, net	784		543
Other current assets	310		232
Liabilities
Accounts payable and accrued liabilities	$	3	$	3
Short-term debt	861		594
Long-term debt	1,632		1,401

See Note 4 – Receivables and Related Allowance for Credit Losses for additional information on the EIP receivables used to secure the ABS Notes.

Credit Facilities

On January 5, 2026, we entered into a Second Amended and Restated Credit Agreement (the “January 2026 Credit Agreement”) with certain financial institutions named therein. The January 2026 Credit Agreement amends and restates in its entirety the Amended and Restated Credit Agreement, dated as of October 17, 2022, and provides for a $10.0 billion revolving credit facility, including a letter of credit sub-facility of up to $1.5 billion and a swingline loan sub-facility of up to $500 million. Commitments under the January 2026 Credit Agreement will mature on January 5, 2031, except as otherwise extended or replaced. Borrowings under the January 2026 Credit Agreement will bear interest based upon the applicable benchmark rate, depending on the type of loan and, in some cases, at our election, plus a margin that is determined by reference to the credit rating of T-Mobile USA’s senior unsecured long-term debt. The January 2026 Credit Agreement contains customary representations, warranties and covenants, including a financial maintenance covenant of 4.5x with respect to T-Mobile USA, Inc.’s Leverage Ratio (as defined therein). As of September 30, 2026, we did not have an outstanding balance under this facility.

Master Receivables Financing Agreement

On February 5, 2026, we entered into a master receivables financing agreement with certain third parties that provides for a revolving loan facility secured by pledged service customer relationships, which include current as well as future monthly service receivables, during the borrowing period (the “MRFA”). Concurrently with the execution of the MRFA, we borrowed $1.0 billion with a floating interest rate indexed to the Secured Overnight Financing Rate (“SOFR”) plus an applicable margin, with an initial scheduled expiry date of February 5, 2027, and principal paydowns beginning thereafter. The net proceeds are presented in Proceeds from issuance of long-term debt on our Condensed Consolidated Statements of Cash Flows for the nine months ended September 30, 2026.

As of September 30, 2026, $1.0 billion of borrowings are secured by approximately $200 million of outstanding service accounts receivable, the related customer service account contracts and future monthly service receivables. The borrowings related to the MRFA and assets securing these borrowings are included on our Condensed Consolidated Balance Sheets.

Restricted Cash

Certain provisions of our debt agreements require us to maintain specified cash collateral balances. Amounts associated with these balances are considered to be restricted cash. See Note 16 – Additional Financial Information for our reconciliation of Cash and cash equivalents, including restricted cash.

- Definition

The entire disclosure for information about short-term and long-term debt arrangements, which includes amounts of borrowings under each line of credit, note payable, commercial paper issue, bonds indenture, debenture issue, own-share lending arrangements and any other contractual agreement to repay funds, and about the underlying arrangements, rationale for a classification as long-term, including repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements, such as the effects of refinancing and noncompliance with debt covenants.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 942
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-Name Accounting Standards Codification
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Reference 8: http://www.xbrl.org/2003/role/disclosureRef
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Reference 11: http://www.xbrl.org/2003/role/disclosureRef
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Reference 12: http://www.xbrl.org/2003/role/disclosureRef
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-URI https://asc.fasb.org/1943274/2147480657/210-10-S50-9

Reference 13: http://www.xbrl.org/2003/role/disclosureRef
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-Paragraph 8A
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480434/815-10-50-8A

Reference 14: http://www.xbrl.org/2003/role/disclosureRef
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Reference 15: http://www.xbrl.org/2003/role/disclosureRef
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Reference 16: http://www.xbrl.org/2003/role/disclosureRef
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Reference 17: http://www.xbrl.org/2003/role/disclosureRef
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Reference 18: http://www.xbrl.org/2003/role/disclosureRef
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Reference 19: http://www.xbrl.org/2003/role/disclosureRef
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Reference 20: http://www.xbrl.org/2003/role/disclosureRef
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Reference 29: http://www.xbrl.org/2003/role/disclosureRef
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+ Details

Joint Ventures (Details) $ in Millions	Oct. 01, 2026 USD ($)	Apr. 25, 2026 USD ($) company	Apr. 24, 2026 company
Wren House Joint Venture
Joint Venture [Line Items]
Number of companies included in joint venture \| company			1
Wren House Joint Venture \| Subsequent Event
Joint Venture [Line Items]
Investments \| $	$ 671
Ownership interest in joint venture (percent)	50.00%
Oak Hill Joint Venture
Joint Venture [Line Items]
Number of companies included in joint venture \| company		2
Investments \| $		$ 2,000
Ownership interest in joint venture (percent)		50.00%

Debt - Narrative (Details)	3 Months Ended		9 Months Ended
Debt - Narrative (Details)	Sep. 30, 2026 USD ($)	Sep. 30, 2025 USD ($)	Sep. 30, 2026 USD ($)	Sep. 30, 2025 USD ($)	Feb. 05, 2026 USD ($)	Jan. 31, 2026
Debt Instrument [Line Items]
Effective interest rate	4.30%	4.20%	4.30%	4.10%
Weighted-average debt outstanding during period	$ 84,400,000,000	$ 83,200,000,000	$ 85,400,000,000	$ 82,100,000,000
Principal Issuances	6,937,000,000		6,937,000,000
Debt instrument, collateral amount	200,000,000		200,000,000
Notes Payable, Other Payables
Debt Instrument [Line Items]
Principal Issuances	1,000,000,000.0		1,000,000,000.0		$ 1,000,000,000.0
Revolving Credit Facility
Debt Instrument [Line Items]
Financial maintenance covenant						4.5
Credit facility outstanding balance	0		0
ABS Notes
Debt Instrument [Line Items]
Proceeds from loan facility	2,500,000,000		2,500,000,000
Gross EIP receivables	3,300,000,000		3,300,000,000
Principal Issuances	1,000,000,000		1,000,000,000
Line of Credit \| Revolving Credit Facility
Debt Instrument [Line Items]
Financing commitment, amount	10,000,000,000.0		10,000,000,000.0
Line of Credit \| Letter of Credit
Debt Instrument [Line Items]
Financing commitment, amount	1,500,000,000		1,500,000,000
Line of Credit \| Bridge Loan
Debt Instrument [Line Items]
Financing commitment, amount	$ 500,000,000		$ 500,000,000

Spectrum License Transactions - Schedule of Spectrum License Activity (Details) - Licensing Agreements $ in Millions	9 Months Ended
	Sep. 30, 2026 USD ($)
Indefinite-lived Intangible Assets [Roll Forward]
Spectrum licenses, beginning of year	$ 98,032
Spectrum license acquisitions	2,478
Spectrum licenses transferred to held for sale	(530)
Spectrum licenses, end of period	$ 99,980

Fair Value Measurements - Schedule of Carrying Values and Fair Values of Short-Term and Long-term Debt (Details) - USD ($) $ in Millions	Sep. 30, 2026	Dec. 31, 2025
Carrying Amount \| Senior Notes \| Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	$ 69,738	$ 74,575
Carrying Amount \| Senior Notes \| Third Party (EUR-denominated) \| Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	8,183	5,551
Carrying Amount \| Senior Notes \| Related Party \| Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	0	1,498
Carrying Amount \| Senior Secured Notes \| Third Party \| Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	559	844
Carrying Amount \| ABS Notes \| Third Party \| Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	2,493	1,995
Carrying Amount \| ECA Facility \| Third Party \| Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	2,693	1,819
Fair Value \| Senior Notes \| Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	60,959	70,517
Fair Value \| Senior Notes \| Third Party (EUR-denominated) \| Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	7,669	5,460
Fair Value \| Senior Notes \| Related Party \| Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	0	1,500
Fair Value \| Senior Secured Notes \| Third Party \| Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	551	835
Fair Value \| ABS Notes \| Third Party \| Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	2,487	2,017
Fair Value \| ECA Facility \| Third Party \| Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	$ 2,746	$ 1,876

Sales of Certain Receivables - Schedule of Variable Interest Entities (Details) - USD ($) $ in Millions	Sep. 30, 2026	Dec. 31, 2025
Variable Interest Entity [Line Items]
Other current liabilities	$ 2,815	$ 2,575
Variable Interest Entity, Not Primary Beneficiary \| Factoring Arrangement
Variable Interest Entity [Line Items]
Other current liabilities	$ 298	$ 306

Fair Value Measurements

9 Months Ended

Sep. 30, 2026

Fair Value Disclosures [Abstract]

Fair Value Measurements

Note 7 – Fair Value Measurements

The carrying values of Cash and cash equivalents, Accounts receivable and Accounts payable and accrued liabilities approximate fair value due to the short-term maturities of these instruments. The carrying values of EIP receivables approximate fair value as the receivables are recorded at their present value using an estimated market interest rate.

Derivative Financial Instruments

We use derivatives to manage exposure to market risk, such as exposure to fluctuations in foreign currency exchange rates and interest rates. We designate certain derivatives as hedging instruments in a qualifying hedge accounting relationship to mitigate fluctuations in values or cash flows related to such risks caused by foreign currency or interest rate volatility. We do not use derivatives for trading or speculative purposes.

Cash flows associated with qualifying hedge derivative instruments are presented in the same category on our Condensed Consolidated Statements of Cash Flows as the item being hedged. For fair value hedges, other than foreign currency hedges, the

change in the fair value of the derivative instruments is recognized in earnings through the same income statement line item as the change in the fair value of the hedged item. For cash flow hedges, as well as fair value foreign currency hedges, the change in the fair value of the derivative instruments is reported in Accumulated other comprehensive loss and recognized in earnings when the hedged item is recognized in earnings, again, through the same income statement line item.

We record derivatives on our Condensed Consolidated Balance Sheets at fair value that is derived primarily from observable market data, including exchange rates, interest rates and forward curves. These market inputs are utilized in the discounted cash flow calculation considering the instrument's term, notional amount, discount rate and credit risk. Significant inputs to derivative valuations are generally observable in active markets and, as such, are classified as Level 2 in the fair value hierarchy.

Cross-Currency Swaps

We enter into cross-currency swaps to offset changes in the value of our payments on foreign-denominated debt in USD and to mitigate the impact of foreign currency transaction gains and losses.

We have entered into cross-currency swap agreements, with the same notional amounts as our EUR-denominated debt issuances, to effectively convert €7.3 billion to USD borrowings, with the same maturities as our EUR-denominated debt issuances. The swaps qualify and have been designated as fair value hedges of our EUR-denominated debt, mitigating our exposure to foreign currency transaction gains and losses.

Accordingly, all changes in the fair value of the swaps will be initially recorded through Accumulated other comprehensive loss on our Condensed Consolidated Balance Sheets and reclassified to earnings in an amount that exactly offsets the periodic transaction gain or loss on remeasuring the debt, such that there will be no earnings volatility due to changes in foreign-currency exchange rates. Transaction gains or losses on remeasuring the EUR-denominated debt, as well as the offsetting swap amounts, are recorded within Other expense, net on our Condensed Consolidated Statements of Comprehensive Income.

Changes in the fair value of the swaps may be different from the current period transaction gain or loss on remeasurement of the debt, in which case the difference will remain in Accumulated other comprehensive loss on our Condensed Consolidated Balance Sheets. These differences generally represent credit or liquidity risk, referred to as a basis spread, and the time value of money (“excluded components”). The value of the excluded components is recognized in earnings using a systematic and rational method by accruing the current-period swap settlements into Interest expense, net, on our Condensed Consolidated Statements of Comprehensive Income. If an amount remains in Accumulated other comprehensive loss on our Condensed Consolidated Balance Sheets upon settlement of the derivative, those amounts will be reclassified to earnings at that time.

The following table summarizes the activity of our cross-currency swaps:


	Three Months Ended September 30,				Nine Months Ended September 30,

(in millions)	2026		2025		2026		2025

Other expense, net
Pre-tax transaction gain (loss) on remeasurement of EUR-denominated debt	$	28	$	25	$	287	$	(654)
Amount recognized in Other expense, net reclassified from Accumulated other comprehensive loss	(28)		(25)		(287)		654
Accumulated other comprehensive loss
Amount recognized in Accumulated other comprehensive loss reclassified to Other expense, net	$	28	$	25	$	287	$	(654)
Gain (loss) associated with the change in fair value of cross-currency swaps recognized in Accumulated other comprehensive loss	8		(52)		(109)		439

Interest Rate Lock Derivatives

In April 2020, we terminated our interest rate lock derivatives entered into in October 2018. Aggregate changes in the fair value of our terminated interest rate lock derivatives, net of amortization, of $619 million and $771 million are presented in Accumulated other comprehensive loss on our Condensed Consolidated Balance Sheets as of September 30, 2026 and December 31, 2025, respectively.

During the three months ended September 30, 2026 and 2025, we amortized $70 million and $64 million, respectively, and during the nine months ended September 30, 2026 and 2025, we amortized $204 million and $189 million, respectively, from Accumulated other comprehensive loss into Interest expense, net, on our Condensed Consolidated Statements of

Comprehensive Income. We expect to amortize $290 million of the Accumulated other comprehensive loss associated with the derivatives into Interest expense, net, over the 12 months ending September 30, 2027.

Debt

The fair values of our Senior Notes and spectrum-backed Senior Secured Notes to third parties were determined based on quoted market prices in active markets. Accordingly, our Senior Notes and spectrum-backed Senior Secured Notes to third parties were classified as Level 1 within the fair value hierarchy. The fair value of our Senior Notes to affiliates was determined based on the fair value of the Senior Notes to third parties with similar terms and maturities. Accordingly, our Senior Notes to affiliates were classified as Level 2 within the fair value hierarchy. The fair values of our Senior Notes to third parties (EUR-denominated) and asset-backed notes (“ABS Notes”) were primarily based on quoted prices in inactive markets for identical instruments and observable changes in market interest rates, both of which are Level 2 inputs. Accordingly, our Senior Notes to third parties (EUR-denominated) and ABS Notes were classified as Level 2 within the fair value hierarchy. The fair value of our borrowings related to credit agreements with certain financial institutions, backed by Export Credit Agencies (the “ECA Facilities”) and the MRFA (as defined below) was determined based on a discounted cash flow approach using market interest rates of instruments with similar maturities and credit risk. Accordingly, our borrowings related to the ECA Facilities and MRFA were classified as Level 2 within the fair value hierarchy.

Although we have determined the estimated fair values using available market information and commonly accepted valuation methodologies, judgment was required in interpreting market data to develop fair value estimates for the Senior Notes to third parties (EUR-denominated), Senior Notes to affiliates, ABS Notes and borrowings related to the ECA Facilities and MRFA. The fair value estimates were based on information available as of September 30, 2026 and December 31, 2025. As such, our estimates are not necessarily indicative of the amount we could realize in a current market exchange.

The carrying amounts and fair values of our short-term and long-term debt, excluding accrued interest, included on our Condensed Consolidated Balance Sheets were as follows:


(in millions)	Level within the Fair Value Hierarchy	September 30, 2026				December 31, 2025
		Carrying Amount		Fair Value		Carrying Amount		Fair Value
Liabilities:
Senior Notes to third parties	1	$	69,738	$	60,959	$	74,575	$	70,517
Senior Notes to third parties (EUR-denominated)	2	8,183		7,669		5,551		5,460
Senior Notes to affiliates	2	—		—		1,498		1,500
Senior Secured Notes to third parties	1	559		551		844		835
ABS Notes to third parties	2	2,493		2,487		1,995		2,017
Borrowings related to ECA Facilities and MRFA	2	2,693		2,746		1,819		1,876

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
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Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Topic 820
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Reference 3: http://www.xbrl.org/2003/role/exampleRef
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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Reference 5: http://www.xbrl.org/2003/role/disclosureRef
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-URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
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Reference 7: http://www.xbrl.org/2003/role/disclosureRef
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Reference 8: http://www.xbrl.org/2003/role/disclosureRef
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Reference 9: http://www.xbrl.org/2003/role/disclosureRef
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Reference 10: http://www.xbrl.org/2003/role/disclosureRef
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Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
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Reference 12: http://www.xbrl.org/2003/role/disclosureRef
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Reference 13: http://www.xbrl.org/2003/role/disclosureRef
-Topic 940
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-Publisher FASB
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+ Details

Cover Page - shares	9 Months Ended
Cover Page - shares	Sep. 30, 2026	Oct. 23, 2026
Entity Listings [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2026
Document Transition Report	false
Entity File Number	1-33409
Entity Registrant Name	T-MOBILE US, INC.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	20-0836269
Entity Address, Address Line One	12920 SE 38th Street
Entity Address, City or Town	Bellevue
Entity Address, State or Province	WA
Entity Address, Postal Zip Code	98006-1350
City Area Code	(425)
Local Phone Number	378-4000
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding (in shares)		1,059,272,571
Entity Central Index Key	0001283699
Amendment Flag	false
Document Fiscal Year Focus	2026
Document Fiscal Period Focus	Q3
Current Fiscal Year End Date	--12-31
Common Stock, par value $0.00001 per share
Entity Listings [Line Items]
Title of 12(b) Security	Common Stock, par value $0.00001 per share
Trading Symbol	TMUS
Security Exchange Name	NASDAQ
3.550% Senior Notes due 2029
Entity Listings [Line Items]
Title of 12(b) Security	3.550% Senior Notes due 2029
Trading Symbol	TMUS29
Security Exchange Name	NASDAQ
3.700% Senior Notes due 2032
Entity Listings [Line Items]
Title of 12(b) Security	3.700% Senior Notes due 2032
Trading Symbol	TMUS32
Security Exchange Name	NASDAQ
3.150% Senior Notes due 2032
Entity Listings [Line Items]
Title of 12(b) Security	3.150% Senior Notes due 2032
Trading Symbol	TMUS32A
Security Exchange Name	NASDAQ
3.200% Senior Notes due 2032
Entity Listings [Line Items]
Title of 12(b) Security	3.200% Senior Notes due 2032
Trading Symbol	TMUS32B
Security Exchange Name	NASDAQ
3.625% Senior Notes due 2035
Entity Listings [Line Items]
Title of 12(b) Security	3.625% Senior Notes due 2035
Trading Symbol	TMUS35
Security Exchange Name	NASDAQ
3.850% Senior Notes due 2036
Entity Listings [Line Items]
Title of 12(b) Security	3.850% Senior Notes due 2036
Trading Symbol	TMUS36
Security Exchange Name	NASDAQ
3.500% Senior Notes due 2037
Entity Listings [Line Items]
Title of 12(b) Security	3.500% Senior Notes due 2037
Trading Symbol	TMUS37
Security Exchange Name	NASDAQ
3.900% Senior Notes due 2038
Entity Listings [Line Items]
Title of 12(b) Security	3.900% Senior Notes due 2038
Trading Symbol	TMUS38
Security Exchange Name	NASDAQ
3.800% Senior Notes due 2045
Entity Listings [Line Items]
Title of 12(b) Security	3.800% Senior Notes due 2045
Trading Symbol	TMUS45
Security Exchange Name	NASDAQ
6.250% Senior Notes due 2069
Entity Listings [Line Items]
Title of 12(b) Security	6.250% Senior Notes due 2069
Trading Symbol	TMUSL
Security Exchange Name	NASDAQ
5.500% Senior Notes due March 2070
Entity Listings [Line Items]
Title of 12(b) Security	5.500% Senior Notes due March 2070
Trading Symbol	TMUSZ
Security Exchange Name	NASDAQ
5.500% Senior Notes due June 2070
Entity Listings [Line Items]
Title of 12(b) Security	5.500% Senior Notes due June 2070
Trading Symbol	TMUSI
Security Exchange Name	NASDAQ

Receivables and Related Allowance for Credit Losses - Schedule of Unamortized Imputed Discount and Allowance for Credit Losses for Equipment Installment Plan Receivables (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2026	Sep. 30, 2025
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for credit losses and unamortized discount, beginning of period	$ 1,172	$ 990
Bad debt expense	1,261	925
Write-offs	(1,246)	(930)
Allowance for credit losses for acquired credit deteriorated receivables	0	88
Change in unamortized discount on short-term and long-term EIP receivables	127	100
Impact on the unamortized discount from sales of EIP receivables	(141)	(135)
Allowance for credit losses and unamortized discount, end of period	1,173	1,038
Accounts Receivable Allowance
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for credit losses and unamortized discount, beginning of period	226	176
Bad debt expense	615	478
Write-offs	(590)	(458)
Allowance for credit losses for acquired credit deteriorated receivables	0	10
Allowance for credit losses and unamortized discount, end of period	251	206
EIP Receivables Allowance
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for credit losses and unamortized discount, beginning of period	946	814
Bad debt expense	646	447
Write-offs	(656)	(472)
Allowance for credit losses for acquired credit deteriorated receivables	0	78
Change in unamortized discount on short-term and long-term EIP receivables	127	100
Impact on the unamortized discount from sales of EIP receivables	(141)	(135)
Allowance for credit losses and unamortized discount, end of period	$ 922	$ 832

Revenue from Contracts with Customers

9 Months Ended

Sep. 30, 2026

Revenue from Contract with Customer [Abstract]

Revenue from Contracts with Customers

Note 10 – Revenue from Contracts with Customers

Disaggregation of Revenue

We provide wireless communications and broadband services to a variety of customers, but focus primarily on two categories:

•Postpaid generally includes customers that are qualified to pay after receiving service utilizing phones, 5G broadband gateways, fiber connections, mobile internet devices (including tablets and hotspots), wearables, DIGITS and other connected devices (including SyncUP and IoT); and

•Prepaid generally includes customers that pay for service in advance.

We also provide services to wholesale customers which include Machine-to-Machine and Mobile Virtual Network Operator customers that operate on our network but are managed by wholesale partners.

The balances presented in each revenue line item on our Condensed Consolidated Statements of Comprehensive Income represent categories of revenue from contracts with customers disaggregated by type of product and service. Postpaid and prepaid service revenues also include revenues earned for providing premium services to customers, such as device insurance services.

Contract Balances

The contract asset and contract liability balances from contracts with customers as of September 30, 2026 and December 31, 2025, were as follows:


(in millions)	Contract Assets		Contract Liabilities

Balance as of December 31, 2025	$	1,307	$	1,653
Balance as of September 30, 2026	1,449		1,457

Change	$	142	$	(196)

Contract assets primarily represent revenue recognized for equipment sales with promotional bill credits offered to customers that are paid over time and are contingent on the customer maintaining a service contract.

The change in the contract asset balance reflects customer activity related to new promotions, offset by billings on existing contracts and impairment, which is recognized as bad debt expense. The current portion of our contract assets of $1.1 billion and $920 million as of September 30, 2026 and December 31, 2025, respectively, was included in Other current assets on our Condensed Consolidated Balance Sheets.

Contract liabilities are recorded when fees are collected, or we have an unconditional right to consideration (a receivable) in advance of delivery of goods or services. Changes in contract liabilities are primarily related to the activity of prepaid customers and contract liabilities assumed in the UScellular Acquisition. Contract liabilities are primarily included in Deferred revenue on our Condensed Consolidated Balance Sheets.

Revenues for the three and nine months ended September 30, 2026 and 2025, include the following:


	Three Months Ended September 30,				Nine Months Ended September 30,
(in millions)	2026		2025		2026		2025
Amounts included in the beginning of year contract liability balance	$	140	$	77	$	1,406	$	1,127

Remaining Performance Obligations

As of September 30, 2026, the aggregate amount of the transaction price allocated to remaining service performance obligations for postpaid contracts with subsidized devices and promotional bill credits that result in an extended service contract is $3.1 billion. We expect to recognize revenue as the service is provided on these postpaid contracts, generally over a period of 24 or 36 months from the time of origination.

Information about remaining performance obligations that are part of a contract that has an original expected duration of one year or less has been excluded from the above, which primarily consists of monthly service contracts.

Certain of our wholesale, roaming and service contracts include variable consideration based on usage and performance. This variable consideration has been excluded from the disclosure of remaining performance obligations. As of September 30, 2026, the aggregate amount of the contractual minimum consideration for wholesale, roaming and service contracts is $314 million, $920 million and $2.6 billion for the remainder of 2026, 2027, and 2028 and beyond, respectively. These contracts have a remaining duration ranging from less than one year to seven years.

Contract Costs

The balance of deferred incremental costs to obtain contracts with customers was $2.1 billion as of September 30, 2026, and $2.0 billion as of December 31, 2025, and is included in Other assets on our Condensed Consolidated Balance Sheets. Deferred contract costs incurred to obtain postpaid service contracts are amortized over a period of 24 or 36 months depending on the customer contract. The amortization periods are monitored to reflect any significant change in assumptions. Amortization of deferred contract costs included in Selling, general and administrative expenses on our Condensed Consolidated Statements of Comprehensive Income were $487 million and $474 million for the three months ended September 30, 2026 and 2025, respectively, and $1.4 billion for both the nine months ended September 30, 2026 and 2025.

The deferred contract cost asset is assessed for impairment on a periodic basis. There were no impairment losses recognized on deferred contract cost assets for the three and nine months ended September 30, 2026 and 2025.

- Definition

The entire disclosure of revenue from contract with customer to transfer good or service and to transfer nonfinancial asset. Includes, but is not limited to, disaggregation of revenue, credit loss recognized from contract with customer, judgment and change in judgment related to contract with customer, and asset recognized from cost incurred to obtain or fulfill contract with customer. Excludes insurance and lease contracts.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 7
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-7

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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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+ Details

Additional Financial Information - Schedule of Supplemental Consolidated Statements of Cash Flows Information (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025
Supplemental Financial Statement Elements [Abstract]
Interest payments, net of amounts capitalized	$ 946	$ 997	$ 3,119	$ 2,923
Operating lease payments	1,302	1,269	4,142	3,685
Income tax payments, net of refunds received	7	63	774	415
Non-cash investing and financing activities
Change in accounts payable and accrued liabilities for purchases of property and equipment	51	136	(710)	(458)
Operating lease right-of-use assets obtained in exchange for lease obligations	582	1,064	1,647	2,138
Financing lease right-of-use assets obtained in exchange for lease obligations	340	324	1,050	1,002
Debt assumed in the UScellular Acquisition	$ 0	$ 1,653	$ 0	$ 1,653

Sales of Certain Receivables - Schedule of Variable Interest Entities - EIP (Details) - USD ($) $ in Millions	Sep. 30, 2026	Dec. 31, 2025
Variable Interest Entity [Line Items]
Other current liabilities	$ 2,815	$ 2,575
EIP Securitization Arrangement
Variable Interest Entity [Line Items]
Other current liabilities	93	90
Other long-term liabilities	$ 12	$ 13

- Definition

Amount of liabilities classified as other.

+ References

+ Details

Commitments and Contingencies	9 Months Ended
Commitments and Contingencies	Sep. 30, 2026
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Note 14 – Commitments and Contingencies Sprint Merger Commitments In connection with the regulatory proceedings and approvals of the Sprint Merger pursuant to the Business Combination Agreement with Sprint and the other parties named therein (as amended, the “Business Combination Agreement”) and the other transactions contemplated by the Business Combination Agreement, we have commitments and other obligations to various state and federal agencies and certain nongovernmental organizations, including pursuant to the Consent Decree agreed to by us, DT, Sprint, SoftBank Group Corp. (“SoftBank”) and DISH Network Corporation (“DISH”) and entered by the U.S. District Court for the District of Columbia, and the FCC’s memorandum opinion and order approving our applications for approval of the Sprint Merger. These commitments and obligations include, among other things, extensive 5G network build-out commitments, obligations to deliver high-speed wireless services to the vast majority of Americans, including Americans residing in rural areas, the marketing of an in-home broadband product where spectrum capacity is available and national security commitments. Many of the commitments specify time frames for compliance and reporting. Failure to fulfill our obligations and commitments in a timely manner could result in substantial fines, penalties, or other legal and administrative actions. Contingencies and Litigation Litigation and Regulatory Matters We are involved in various lawsuits and disputes, claims, government agency investigations and enforcement actions, and other proceedings (“Litigation and Regulatory Matters”) that arise in the ordinary course of business, which include claims of patent infringement (most of which are asserted by non-practicing entities primarily seeking monetary damages), class actions, and proceedings to enforce FCC or other government agency rules and regulations. Those Litigation and Regulatory Matters are at various stages, and some of them may proceed to trial, arbitration, hearing, or other adjudication that could result in fines, penalties, or awards of monetary or injunctive relief in the coming 12 months if they are not otherwise resolved. We have established an accrual with respect to certain of these matters, where appropriate. The accruals are reflected on our condensed consolidated financial statements, but they are not considered to be, individually or in the aggregate, material. An accrual is established when we believe it is both probable that a loss has been incurred and an amount can be reasonably estimated. For other matters, where we have not determined that a loss is probable or because the amount of loss cannot be reasonably estimated, we have not recorded an accrual due to various factors typical in contested proceedings, including, but not limited to, uncertainty concerning legal theories and their resolution by courts or regulators, uncertain damage theories and demands, and a less than fully developed factual record. For Litigation and Regulatory Matters that may result in a contingent gain, we recognize such gains on our condensed consolidated financial statements when the gain is realized or realizable. We recognize legal costs expected to be incurred in connection with Litigation and Regulatory Matters as they are incurred. Except as otherwise specified below, we do not expect that the ultimate resolution of these Litigation and Regulatory Matters, individually or in the aggregate, will have a material adverse effect on our financial position, but we note that an unfavorable outcome of some or all of the specific matters identified below, or other matters that we are or may become involved in could have a material adverse impact on results of operations or cash flows for a particular period. This assessment is based on our current understanding of relevant facts and circumstances. As such, our view of these matters is subject to inherent uncertainties and may change in the future. On February 28, 2020, T-Mobile and Sprint each received a Notice of Apparent Liability for Forfeiture and Admonishment from the FCC, which proposed a penalty for allegedly violating section 222 of the Communications Act and the FCC’s regulations governing the privacy of customer information. On April 29, 2024, the FCC issued Forfeiture Orders against T-Mobile and Sprint that largely adopted the allegations and conclusions of the Notices of Apparent Liability and imposed penalties on T-Mobile and Sprint. T-Mobile and Sprint paid those penalties under protest, and on June 27, 2024, T-Mobile and Sprint filed Petitions for Review challenging the FCC’s Forfeiture Orders in the United States Court of Appeals for the District of Columbia. On August 15, 2025, a panel of three judges denied the petitions for review. On January 23, 2026, the Court of Appeals denied T-Mobile’s petitions for rehearing and rehearing en banc. T-Mobile filed a petition for a writ of certiorari with the United States Supreme Court, which remains pending. We are unable to predict the potential outcome of those proceedings. On June 1, 2021, a putative shareholder class action and derivative lawsuit was filed in the Delaware Court of Chancery, Dinkevich v. Deutsche Telekom AG, et al., Case No. C.A. No. 2021-0479, against DT, SoftBank and certain of our current and former officers and directors, asserting breach of fiduciary duty claims relating to the repricing amendment to the Business Combination Agreement and to SoftBank’s monetization of its T-Mobile shares. We are also named as a nominal defendant in the case. We are unable to predict the potential outcome of these claims. On August 12, 2021, we became aware of a cybersecurity issue involving unauthorized access to T-Mobile’s systems (the “August 2021 cyberattack”). Our investigation uncovered that the perpetrator had illegally gained access to certain areas of our systems on or about March 18, 2021, but only gained access to and took data of current, former, and prospective customers beginning on or about August 3, 2021. As a result of the August 2021 cyberattack, we have become subject to numerous lawsuits, including mass arbitration claims and multiple class action lawsuits that have been filed in numerous jurisdictions seeking, among other things, unspecified monetary damages, costs and attorneys’ fees arising out of the August 2021 cyberattack. In December 2021, the Judicial Panel on Multidistrict Litigation consolidated the federal class action lawsuits in the U.S. District Court for the Western District of Missouri under the caption In re: T-Mobile Customer Data Security Breach Litigation, Case No. 21-md-3019-BCW. On July 22, 2022, we entered into an agreement to settle the lawsuit. On June 29, 2023, the Court issued an order granting final approval of the settlement. All appeals have been resolved, and the settlement is now final. Under the terms of the settlement, we have paid an aggregate of $350 million to fund claims submitted by class members, the legal fees of plaintiffs’ counsel and the costs of administering the settlement. As required under the terms of the settlement, we have spent an aggregate of $150 million for data security and related technology in 2022 and 2023. The settlement provides a full release of all claims arising out of the August 2021 cyberattack by class members who did not opt out, against all defendants, including us, our subsidiaries and affiliates, and our directors and officers. The settlement contains no admission of liability, wrongdoing or responsibility by any of the defendants. We anticipate that this settlement of the class action, along with other settlements of separate consumer claims that have been previously completed or are currently pending, will resolve substantially all of the claims brought to date by our current, former and prospective customers who were impacted by the August 2021 cyberattack. In connection with the class action settlement and the separate settlements, we recorded a total pre-tax charge of approximately $400 million in the second quarter of 2022. We have also received inquiries and contested legal proceedings from various government agencies, law enforcement and other governmental authorities related to the August 2021 cyberattack, which could result in substantial fines or penalties. We reached an agreement with the FCC, which was announced on September 30, 2024, to resolve one of those inquiries. We will continue to respond to the other agencies and regulators inquiring about the matter with an aim to resolve all of these matters. While we hope to resolve them in the near term, we cannot predict the timing or outcome of any of these matters or whether we may be subject to further regulatory inquiries, investigations, or legal or enforcement actions. In light of the inherent uncertainties involved in such matters, and based on the information currently available to us, in addition to the previously recorded pre-tax charge of approximately $400 million noted above, we believe it is reasonably possible that we could incur additional losses associated with these proceedings and inquiries, and we will continue to evaluate information as it becomes known and will record an estimate for losses at the time or times when it is both probable that a loss has been incurred and the amount of the loss is reasonably estimable. Ongoing legal and other costs related to these proceedings and inquiries, as well as any potential future actions, may be substantial, and losses associated with any adverse judgments, settlements, penalties or other resolutions of such proceedings and inquiries could be material to our business, reputation, financial condition, cash flows and operating results. On June 17, 2022, plaintiffs filed a putative antitrust class action complaint in the Northern District of Illinois, Dale, et al. v. Deutsche Telekom AG, et al., Case No. 1:22-cv-03189, against DT, T-Mobile, and SoftBank, alleging that the Sprint Merger violated the antitrust laws and harmed competition in the U.S. retail cell service market. Plaintiffs seek injunctive relief and trebled monetary damages on behalf of a purported class of AT&T and Verizon customers whom plaintiffs allege paid artificially inflated prices due to the Sprint Merger. We are vigorously defending this lawsuit, but we are unable to predict the potential outcome. On January 5, 2023, we identified that a bad actor was obtaining data through a single Application Programming Interface (“API”) without authorization. Based on our investigation, the impacted API is only able to provide a limited set of customer account data, including name, billing address, email, phone number, date of birth, T-Mobile account number and information, such as the number of lines on the account and plan features. The result from our investigation indicates that the bad actor(s) obtained data from this API for approximately 37 million current postpaid and prepaid customer accounts, though many of these accounts did not include the full data set. We believe that the bad actor first retrieved data through the impacted API starting on or around November 25, 2022. We have notified individuals whose information was impacted consistent with state and federal requirements. In connection with the January 2023 cyberattack, we became subject to consumer class actions and regulatory inquiries. The consumer class actions have been dismissed without prejudice. We will continue to respond to regulatory inquiries and may incur significant expenses in connection with these matters. We cannot predict the timing or outcome of any of these potential matters or whether we may be subject to additional legal proceedings, claims, regulatory inquiries, investigations, or enforcement actions. On February 25, 2025, a purported Company shareholder filed a putative class action and derivative lawsuit in the Delaware Court of Chancery under the caption Palkon v. Deutsche Telekom AG, et al., Case No. 2025-0211-PAF, against four DT entities, our current directors, and certain of our former directors, asserting breach of fiduciary duty and unjust enrichment claims relating to our 2022 Stock Repurchase Program and our 2023-2024 Stockholder Return Program. We are also named as a nominal defendant in the lawsuit. We are unable to predict the potential outcome of these claims.

Business Combinations - Schedule of Fair Value of Consideration Transferred (Details) - UScellular Wireless Assets Operations $ in Millions	Aug. 01, 2025 USD ($)
Business Combination [Line Items]
Fair value of cash paid on the UScellular Acquisition Date, as adjusted	$ 2,770
Fair value of T-Mobile replacement equity awards attributable to pre-combination service	44
Total fair value of consideration exchanged	$ 2,814

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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+ Details

Receivables and Related Allowance for Credit Losses - Narrative (Details) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2026 USD ($) segment class	Dec. 31, 2025
Financing Receivable, Allowance for Credit Loss [Line Items]
Portfolio segments \| segment	2
Customer classes \| class	2
Off-balance-sheet credit exposures \| $	$ 0
EIP Receivables Allowance
Financing Receivable, Allowance for Credit Loss [Line Items]
Weighted average effective imputed interest rate	10.90%	10.30%
Minimum
Financing Receivable, Allowance for Credit Loss [Line Items]
Installment period	24 months
Maximum
Financing Receivable, Allowance for Credit Loss [Line Items]
Installment period	36 months

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-Name Regulation S-K (SK)
-Number 229
-Section 1405
-Paragraph c
-Publisher SEC

+ Details

Segment Reporting

9 Months Ended

Sep. 30, 2026

Segment Reporting [Abstract]

Segment Reporting

Note 11 – Segment Reporting

We manage our business activities on a consolidated basis and operate as a single operating segment: Wireless. We primarily derive our revenue in the United States by providing wireless communications and broadband services to customers using our wireless networks and selling devices that provide customers access to our wireless networks. The accounting policies of the Wireless segment are the same as those described in Part II, Item 8, Note 1 – Summary of Significant Accounting Policies of our Annual Report on Form 10-K for the year ended December 31, 2025.

Our chief operating decision maker (“CODM”) is our President and Chief Executive Officer. The CODM uses Net income, as reported on our Condensed Consolidated Statements of Comprehensive Income, in evaluating performance of the Wireless segment and determining how to allocate resources of the Company as a whole, including investing in our networks and customers, stockholder return programs and acquisition strategy. The CODM does not review assets in evaluating the results of the Wireless segment, and therefore, such information is not presented.

The following table provides the operating financial results of our Wireless segment:


	Three Months Ended September 30,				Nine Months Ended September 30,
(in millions)	2026		2025		2026		2025
Total revenues	$	23,584	$	21,957	$	69,482	$	63,975
Less: Significant and other segment expenses
Cost of equipment sales	5,444		4,853		15,987		14,310
Employee expenses	1,978		2,210		6,083		6,021
Lease expense	1,339		1,340		4,280		3,805
Advertising expense	956		906		2,783		2,582
Bad debt expense	437		337		1,261		925
Other segment items (1)	4,317		4,095		12,737		11,759
Impairment expense	—		278		—		278

Depreciation and amortization	3,452		3,408		10,703		9,752
Interest expense, net	1,031		924		3,117		2,762
Other expense, net	90		78		329		135
Income tax expense	1,085		814		3,004		2,757
Segment net income	$	3,455	$	2,714	$	9,198	$	8,889

(1)Other segment items included in Segment net income primarily include certain third-party commissions, external labor and services and backhaul expenses.

- Definition

The entire disclosure for segment reporting.

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+ Details

Sales of Certain Receivables (Tables)

9 Months Ended

Sep. 30, 2026

Transfers and Servicing [Abstract]

Schedule of Variable Interest Entities - EIP


(in millions)	September 30, 2026		December 31, 2025

Other current liabilities	$	93	$	90
Other long-term liabilities	12		13

Schedule of Variable Interest Entities

The following table summarizes the carrying amounts and classification of liabilities included on our Condensed Consolidated Balance Sheets with respect to the Service BRE:


(in millions)	September 30, 2026		December 31, 2025

Other current liabilities	$	298	$	306

The following table summarizes the carrying amounts and classification of assets and liabilities included on our Condensed Consolidated Balance Sheets with respect to the ABS Entities:


(in millions)	September 30, 2026		December 31, 2025

Assets
Equipment installment plan receivables, net	$	2,203	$	1,865
Equipment installment plan receivables due after one year, net	784		543
Other current assets	310		232
Liabilities
Accounts payable and accrued liabilities	$	3	$	3
Short-term debt	861		594
Long-term debt	1,632		1,401

Schedule of Factoring Arrangement

The following table summarizes the impact of the sales of certain service receivables and EIP receivables on our Condensed Consolidated Balance Sheets:


(in millions)	September 30, 2026		December 31, 2025
Derecognized net service accounts receivable and EIP receivables	$	1,663	$	1,651


Other current liabilities	391		397
of which, recourse guarantee	125		117
Other long-term liabilities	12		13
of which, recourse guarantee	12		13
Net cash proceeds since inception	1,310		1,372
Of which:
Change in net cash proceeds during the year-to-date period	(62)		(96)
Net cash proceeds funded by reinvested collections	1,372		1,468

- Definition

Tabular disclosure of the significant judgments and assumptions made in determining whether a variable interest (as defined) held by the entity requires the variable interest entity (VIE) (as defined) to be consolidated and (or) disclose information about its involvement with the VIE, individually or in aggregate (as applicable); the nature of restrictions, if any, on the consolidated VIE's assets and on the settlement of its liabilities reported by an entity in its statement of financial position, including the carrying amounts of such assets and liabilities; the nature of, and changes in, the risks associated with involvement in the VIE; how involvement with the VIE affects the entity's financial position, financial performance, and cash flows; the lack of recourse if creditors (or beneficial interest holders) of the consolidated VIE have no recourse to the general credit of the primary beneficiary (if applicable); the terms of arrangements, giving consideration to both explicit arrangements and implicit variable interests, if any, that could require the entity to provide financial support to the VIE, including events or circumstances that could expose the entity to a loss; the methodology used by the entity for determining whether or not it is the primary beneficiary of the variable interest entity; the significant factors considered and judgments made in determining that the power to direct the activities of a VIE that most significantly impact the VIE's economic performance are shared (as defined); the carrying amounts and classification of assets and liabilities of the VIE included in the statement of financial position; the entity's maximum exposure to loss, if any, as a result of its involvement with the VIE, including how the maximum exposure is determined and significant sources of the entity's exposure to the VIE; a comparison of the carrying amounts of the assets and liabilities and the entity's maximum exposure to loss; information about any liquidity arrangements, guarantees, and (or) other commitments by third parties that may affect the fair value or risk of the entity's variable interest in the VIE; whether or not the entity has provided financial support or other support (explicitly or implicitly) to the VIE that it was not previously contractually required to provide or whether the entity intends to provide that support, including the type and amount of the support and the primary reasons for providing the support; and supplemental information the entity determines necessary to provide.

+ References + Details

Joint Ventures	9 Months Ended
Joint Ventures	Sep. 30, 2026
Business Combination, Asset Acquisition, Transaction between Entities under Common Control, and Joint Venture Formation [Abstract]
Joint Ventures	Note 3 – Joint Ventures Fiber Joint Ventures i3 Broadband Joint Venture On April 24, 2026, we entered into a definitive agreement with an affiliate of Wren House Infrastructure Management Limited (“Wren House”) to establish a joint venture to acquire i3 Broadband, one of Wren House’s existing fiber portfolio companies. Subsequent to September 30, 2026, on October 1, 2026, we completed the joint acquisition of i3 Broadband upon the completion of certain customary closing conditions, including the receipt of certain regulatory approvals. At closing, we invested $671 million to acquire a 50% equity interest in the joint venture and substantially all existing residential fiber customers. GoNetspeed and Greenlight Networks Joint Venture On April 25, 2026, we entered into definitive agreements with affiliates of Oak Hill Capital Management, LLC (“Oak Hill”) to establish a joint venture to acquire GoNetspeed and Greenlight Networks, two of Oak Hill’s existing fiber portfolio companies. The transaction with Oak Hill is expected to close in the first half of 2027, subject to customary closing conditions and regulatory approvals, at which time we expect to invest approximately $2.0 billion to acquire a 50% equity interest in the joint venture and substantially all existing residential fiber customers. Method of Accounting Upon closing of these transactions, we expect to account for these fiber joint ventures under the equity method of accounting and recognize service revenues for the acquired fiber customers and wholesale costs paid to the joint venture for network access within Postpaid revenues and Cost of services, respectively, on our Condensed Consolidated Statements of Comprehensive Income. Joint Venture with AT&T and Verizon On September 14, 2026, we entered into definitive agreements and formed a joint venture with AT&T Inc. and Verizon Communications Inc., or wholly owned subsidiaries thereof, which aims to end wireless dead zones in the U.S., including in rural areas, by pooling certain spectrum resources to increase capacity and help satellite providers reach more customers through a unified platform. We expect to license certain intellectual property to the joint venture, and will also commit to provide access to certain spectrum licenses to satellite service providers who contract with the joint venture. The formation of this joint venture did not have a material impact on our condensed consolidated financial statements. We account for the joint venture with AT&T and Verizon under the equity method of accounting.

- Definition

The entire disclosure for joint venture formation.

+ References + Details

Tower Obligations - Schedule of Impacts to Consolidated Balance Sheets (Details) - USD ($) $ in Millions	Sep. 30, 2026	Dec. 31, 2025
Property and equipment, net
Sale Leaseback Transaction [Line Items]
Sale-leasebacks	$ 1,815	$ 1,922
Tower obligations
Sale Leaseback Transaction [Line Items]
Sale-leasebacks	3,419	3,532
Other long-term liabilities
Sale Leaseback Transaction [Line Items]
Sale-leasebacks	$ 554	$ 554

Additional Financial Information - Schedule of Cash and Cash Equivalents, Including Restricted Cash (Details) - USD ($) $ in Millions	Sep. 30, 2026	Dec. 31, 2025
Supplemental Financial Statement Elements [Abstract]
Cash and cash equivalents	$ 5,620	$ 5,598
Restricted cash (included in Other current assets)	321	296
Restricted cash (included in Other assets)	85	82
Cash and cash equivalents, including restricted cash	$ 6,026	$ 5,976

Sales of Certain Receivables - Schedule of Factoring Arrangement (Details) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2026	Dec. 31, 2025
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]
Other current liabilities	$ 2,815	$ 2,575
Other long-term liabilities	4,196	3,794
Factoring and EIP Securitization Arrangement
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]
Derecognized net service accounts receivable and EIP receivables	1,663	1,651
Other current liabilities	391	397
Other long-term liabilities	12	13
Net cash proceeds since inception	1,310	1,372
Of which:
Change in net cash proceeds during the year-to-date period	(62)	(96)
Net cash proceeds funded by reinvested collections	1,372	1,468
Factoring and EIP Securitization Arrangement \| Balance Sheet Location [Axis]: us-gaap:OtherLiabilitiesCurrent
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]
Carrying amounts of deferred purchase price assets	125	117
Factoring and EIP Securitization Arrangement \| Balance Sheet Location [Axis]: us-gaap:OtherLiabilitiesNoncurrent
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]
Carrying amounts of deferred purchase price assets	$ 12	$ 13

Revenue from Contracts with Customers - Schedule of Contract Liability and Receivable Balances (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025	Dec. 31, 2025
Revenue from Contract with Customer [Abstract]
Contract Assets	$ 1,449		$ 1,449		$ 1,307
Contract Liabilities	1,457		1,457		$ 1,653
Change in contract assets included in other current assets			142
Change in contracts liabilities included in deferred revenue			(196)
Amounts included in the beginning of year contract liability balance	$ 140	$ 77	$ 1,406	$ 1,127

Spectrum License Transactions - Narrative (Details) $ in Millions						1 Months Ended		3 Months Ended		9 Months Ended		17 Months Ended
	Sep. 21, 2026 USD ($) subsidiary	Aug. 10, 2026 USD ($)	Jun. 02, 2026 USD ($)	Jan. 13, 2025 USD ($)	Sep. 12, 2023 USD ($)	Jul. 31, 2026 USD ($)	Jun. 30, 2026 USD ($) license	Sep. 30, 2026 USD ($)	Sep. 30, 2025 USD ($)	Sep. 30, 2026 USD ($)	Sep. 30, 2025 USD ($)	Dec. 31, 2027 USD ($)	Apr. 30, 2026 USD ($)
Indefinite-lived Intangible Assets [Line Items]
Number of FCC licenses won at auction \| license							102
Purchase of spectrum licenses								$ 324	$ 1,590	$ 834	$ 2,505
Proceeds from the sale of property, equipment and intangible assets								2,927	18	3,038	2,091
Spectrum Auction Licenses
Indefinite-lived Intangible Assets [Line Items]
Purchase of spectrum licenses						$ 253
Licensing Agreements
Indefinite-lived Intangible Assets [Line Items]
Consideration transferred			$ 46
License purchase agreement, minimum period before termination allowed					2 years
Licensing Agreements \| Spectrum Exchange Transactions
Indefinite-lived Intangible Assets [Line Items]
Gain on spectrum exchange transactions								14	0	$ 38	13
Licensing Agreements \| 800 MHz Spectrum Licenses
Indefinite-lived Intangible Assets [Line Items]
Proceeds from the sale of property, equipment and intangible assets		$ 2,900
Purchase price consideration for the assets disposed		3,600
Share of future proceeds (percent)										50.00%
Licensing Agreements \| Minimum
Indefinite-lived Intangible Assets [Line Items]
Total cash consideration				$ 1,200	$ 1,200
Licensing Agreements \| Maximum
Indefinite-lived Intangible Assets [Line Items]
Total cash consideration				$ 3,400	3,300
Optional Sale Licenses \| Minimum
Indefinite-lived Intangible Assets [Line Items]
Total cash consideration					$ 2,100
Spectrum Auction Licenses
Indefinite-lived Intangible Assets [Line Items]
Consideration transferred							$ 278
Deposits assets													$ 25
Spectrum licenses
Indefinite-lived Intangible Assets [Line Items]
Purchase of spectrum licenses	$ 290
Number of seller's subsidiaries involved in the transaction \| subsidiary	2
Spectrum licenses \| Licensing Agreements \| Forecast
Indefinite-lived Intangible Assets [Line Items]
Increase our cash tax liability												$ 850
Spectrum licenses \| Licensing Agreements \| 800 MHz Spectrum Licenses
Indefinite-lived Intangible Assets [Line Items]
Purchase price consideration for the assets disposed		$ 690
Non-Cash Spectrum License Acquisitions \| Licensing Agreements \| Spectrum Exchange Transactions
Indefinite-lived Intangible Assets [Line Items]
Consideration transferred, exchange of licenses								$ 501	$ 0	$ 549	$ 173

Fair Value Measurements - Narrative (Details) $ in Millions, € in Billions	3 Months Ended		9 Months Ended
	Sep. 30, 2026 USD ($)	Sep. 30, 2025 USD ($)	Sep. 30, 2026 USD ($)	Sep. 30, 2025 USD ($)	Sep. 30, 2026 EUR (€)	Dec. 31, 2025 USD ($)
Derivative [Line Items]
Accumulated other comprehensive loss	$ 595		$ 595			$ 848
Income Statement Location [Axis]: us-gaap:InterestIncomeExpenseNonoperatingNet
Derivative [Line Items]
Amount amortized from AOCI into interest expense	70	$ 64	204	$ 189
Amount expected to be amortized from AOCI into interest expense over next 12 months			290
Cross-Currency Swap
Derivative [Line Items]
Other finance liabilities \| €					€ 7.3
Amount amortized from AOCI into interest expense	28	$ 25	287	$ (654)
Interest Rate Contract
Derivative [Line Items]
Accumulated other comprehensive loss	$ 619		$ 619			$ 771

- Definition

Amount, after tax, of accumulated increase (decrease) in equity from transaction and other event and circumstance from nonowner source.

+ References

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-Name Accounting Standards Codification
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-Paragraph 14
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482790/220-10-45-14

+ Details

Condensed Consolidated Balance Sheets - USD ($) $ in Millions	Sep. 30, 2026	Dec. 31, 2025
Current assets
Cash and cash equivalents	$ 5,620	$ 5,598
Accounts receivable, net of allowance for credit losses of $251 and $226	5,012	4,874
Equipment installment plan receivables, net of allowance for credit losses and unamortized discount of $723 and $733	4,530	4,997
Inventory	3,085	2,405
Prepaid expenses	909	1,215
Other current assets	2,686	5,372
Total current assets	21,842	24,461
Property and equipment, net	36,035	38,333
Operating lease right-of-use assets	24,208	25,692
Financing lease right-of-use assets	2,987	2,760
Goodwill	13,665	13,678
Spectrum licenses	99,980	98,032
Other intangible assets, net	3,066	3,843
Equipment installment plan receivables due after one year, net of allowance for credit losses and unamortized discount of $199 and $213	2,457	2,683
Other assets	8,864	9,755
Total assets	213,104	219,237
Current liabilities
Accounts payable and accrued liabilities	8,624	10,280
Short-term debt	6,343	5,135
Deferred revenue	1,407	1,533
Short-term operating lease liabilities	3,644	3,814
Short-term financing lease liabilities	1,158	1,163
Other current liabilities	2,815	2,575
Total current liabilities	23,991	24,500
Tower obligations	3,419	3,532
Deferred tax liabilities	21,715	19,583
Operating lease liabilities	25,017	26,371
Financing lease liabilities	1,136	1,107
Other long-term liabilities	4,196	3,794
Total long-term liabilities	132,806	135,534
Commitments and contingencies (Note 14)
Stockholders' equity
Common stock, par value $0.00001 per share, 2,000,000,000 shares authorized; 1,280,056,882 and 1,275,774,235 shares issued, 1,062,845,266 and 1,106,930,661 shares outstanding	0	0
Additional paid-in capital	70,089	69,460
Treasury stock, at cost, 217,211,616 and 168,843,574 shares	(40,102)	(30,545)
Accumulated other comprehensive loss	(595)	(848)
Retained earnings	26,915	21,136
Total stockholders' equity	56,307	59,203
Total liabilities and stockholders' equity	213,104	219,237
Nonrelated Party
Current liabilities
Long-term debt	77,323	79,649
Related Party
Current liabilities
Long-term debt	$ 0	$ 1,498

Debt - Schedule of Debt Balances and Activity (Details) $ in Millions	9 Months Ended
	Sep. 30, 2026 USD ($)
Debt Balances and Activity [Roll Forward]
Long-term debt, proceeds from issuances and borrowings	$ 6,891
Total Debt
Debt Balances and Activity [Roll Forward]
Total debt, beginning balance	86,282
Proceeds from issuances and borrowings	6,891
Redemptions and Repayments	(9,175)
Reclassifications	0
Other	(332)
Total debt, ending balance	83,666
Third Party
Debt Balances and Activity [Roll Forward]
Short-term debt, proceeds from issuances and borrowings	0
Long-term debt, proceeds from issuances and borrowings	6,891
Third Party \| Short-term debt
Debt Balances and Activity [Roll Forward]
Other	3
Third Party \| Long-term debt
Debt Balances and Activity [Roll Forward]
Other	(335)
Third Party \| Total Debt
Debt Balances and Activity [Roll Forward]
Total debt, beginning balance	84,784
Proceeds from issuances and borrowings	6,891
Redemptions and Repayments	(7,677)
Reclassifications	0
Other	(332)
Total debt, ending balance	83,666
Affiliates
Debt Balances and Activity [Roll Forward]
Proceeds from issuances and borrowings	0
Affiliates \| Long-term debt
Debt Balances and Activity [Roll Forward]
Other	0
Location, Statement of Financial Position, Activity, Accrual [Axis]: us-gaap:LongTermDebtNoncurrent \| Third Party
Debt Balances and Activity [Roll Forward]
Reclassifications	(6,167)
Location, Statement of Financial Position, Activity, Accrual [Axis]: us-gaap:LongTermDebtNoncurrent \| Affiliates
Debt Balances and Activity [Roll Forward]
Reclassifications	0
Location, Statement of Financial Position, Activity, Accrual [Axis]: us-gaap:ShortTermBorrowings \| Third Party
Debt Balances and Activity [Roll Forward]
Reclassifications	6,167
Balance Sheet Location [Axis]: us-gaap:LongTermDebtNoncurrent \| Third Party
Debt Balances and Activity [Roll Forward]
Long-term debt, beginning balance	79,649
Redemptions and Repayments	(2,715)
Long-term debt, ending balance	77,323
Balance Sheet Location [Axis]: us-gaap:LongTermDebtNoncurrent \| Affiliates
Debt Balances and Activity [Roll Forward]
Total debt, beginning balance	1,498
Redemptions and Repayments	(1,498)
Total debt, ending balance	0
Balance Sheet Location [Axis]: us-gaap:ShortTermBorrowings \| Third Party
Debt Balances and Activity [Roll Forward]
Short-term debt, beginning balance	5,135
Redemptions and Repayments	(4,962)
Short-term debt, ending balance	$ 6,343

Segment Reporting (Details) $ in Millions	3 Months Ended		9 Months Ended
Segment Reporting (Details) $ in Millions	Sep. 30, 2026 USD ($)	Sep. 30, 2025 USD ($)	Sep. 30, 2026 USD ($) segment	Sep. 30, 2025 USD ($)
Segment Reporting [Abstract]
Number of operating segments \| segment			1
Number of reportable segments \| segment			1
Segment Reporting [Line Items]
Total revenues	$ 23,584	$ 21,957	$ 69,482	$ 63,975
Less: Significant and other segment expenses
Bad debt expense	437	337	1,261	925
Impairment expense	0	278	0	278
Interest expense, net	1,031	924	3,117	2,762
Other expense, net	90	78	329	135
Income tax expense	1,085	814	3,004	2,757
Net income	3,455	2,714	9,198	8,889
Equipment revenues
Segment Reporting [Line Items]
Total revenues	3,929	3,465	11,449	10,608
Less: Significant and other segment expenses
Cost of equipment sales	5,444	4,853	15,987	14,310
Wireless
Segment Reporting [Line Items]
Total revenues	23,584	21,957	69,482	63,975
Less: Significant and other segment expenses
Employee expenses	1,978	2,210	6,083	6,021
Lease expense	1,339	1,340	4,280	3,805
Advertising expense	956	906	2,783	2,582
Bad debt expense	437	337	1,261	925
Other segment items	4,317	4,095	12,737	11,759
Impairment expense	0	278	0	278
Depreciation and amortization	3,452	3,408	10,703	9,752
Interest expense, net	1,031	924	3,117	2,762
Other expense, net	90	78	329	135
Income tax expense	1,085	814	3,004	2,757
Net income	3,455	2,714	9,198	8,889
Wireless \| Equipment revenues
Less: Significant and other segment expenses
Cost of equipment sales	$ 5,444	$ 4,853	$ 15,987	$ 14,310

Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025
Revenues
Total revenues	$ 23,584	$ 21,957	$ 69,482	$ 63,975
Operating expenses
Selling, general and administrative	6,020	6,015	17,820	16,900
Impairment expense	0	278	0	278
Depreciation and amortization	3,452	3,408	10,703	9,752
Total operating expenses	17,923	17,427	53,834	49,432
Operating income	5,661	4,530	15,648	14,543
Other expense, net
Interest expense, net	(1,031)	(924)	(3,117)	(2,762)
Other expense, net	(90)	(78)	(329)	(135)
Total other expense, net	(1,121)	(1,002)	(3,446)	(2,897)
Income before income taxes	4,540	3,528	12,202	11,646
Income tax expense	(1,085)	(814)	(3,004)	(2,757)
Net income	3,455	2,714	9,198	8,889
Other comprehensive income (loss), net of tax
Reclassification of loss from cash flow hedges, net of tax effect of $18, $16, $52 and $48	52	48	152	141
Gains (losses) on fair value hedges, net of tax effect of $9, $(7), $45 and $(55)	27	(20)	133	(160)
Unrealized gain (loss) on foreign currency translation adjustment, net of tax effect of $1, $0, $1 and $0	1	0	10	(1)
Prior service cost, net of amortization, and amortization of actuarial gain, on pension and other postretirement benefits, net of tax effect of $(13), $0, $(14) and $(1)	(40)	(1)	(42)	(4)
Other comprehensive income (loss)	40	27	253	(24)
Total comprehensive income	$ 3,495	$ 2,741	$ 9,451	$ 8,865
Earnings per share
Basic (in USD per share)	$ 3.23	$ 2.42	$ 8.49	$ 7.84
Diluted (in USD per share)	$ 3.22	$ 2.41	$ 8.47	$ 7.82
Weighted-average shares outstanding
Basic (in shares)	1,070,648,134	1,123,754,096	1,084,089,790	1,133,743,367
Diluted (in shares)	1,071,630,434	1,126,627,708	1,085,476,683	1,136,920,521
Service
Revenues
Total revenues	$ 19,375	$ 18,241	$ 57,189	$ 52,604
Operating expenses
Cost of services, exclusive of depreciation and amortization shown separately below	3,007	2,873	9,324	8,192
Postpaid revenues
Revenues
Total revenues	16,269	14,882	47,751	42,554
Prepaid revenues
Revenues
Total revenues	2,427	2,625	7,417	7,911
Wholesale and other service revenues
Revenues
Total revenues	679	734	2,021	2,139
Equipment revenues
Revenues
Total revenues	3,929	3,465	11,449	10,608
Operating expenses
Cost of services, exclusive of depreciation and amortization shown separately below	5,444	4,853	15,987	14,310
Other revenues
Revenues
Total revenues	$ 280	$ 251	$ 844	$ 763

Spectrum License Transactions

9 Months Ended

Sep. 30, 2026

Intangible Asset, Goodwill and Other [Abstract]

Spectrum License Transactions

Note 6 – Spectrum License Transactions

Spectrum Licenses

The following table summarizes our spectrum license activity for the nine months ended September 30, 2026:


(in millions)	Spectrum
Spectrum licenses, beginning of year	$	98,032

Spectrum license acquisitions	2,478

Spectrum licenses transferred to held for sale	(530)


Spectrum licenses, end of period	$	99,980

Cash payments to acquire spectrum licenses and payments for costs to clear spectrum are included in Purchases of spectrum licenses and other intangible assets, including deposits. Cash proceeds from the sale of spectrum licenses are included in Proceeds from the sale of property, equipment and intangible assets on our Condensed Consolidated Statements of Cash Flows.

Spectrum Auction

In June 2026, the Federal Communications Commission (“FCC”) announced that we were the winning bidder of 102 licenses in Auction 113 (AWS-3 band spectrum) for an aggregate purchase price of $278 million. At the inception of Auction 113 in April 2026, we deposited $25 million. We paid the FCC the remaining $253 million for the licenses won in the auction in July 2026. On August 23, 2026, the FCC issued to us the licenses won in Auction 113. The licenses are included in Spectrum licenses on our Condensed Consolidated Balance Sheets as of September 30, 2026.

License Purchase Agreements

On September 21, 2026, we acquired 600 MHz spectrum licenses from TStar 600, LLC and two of its subsidiaries, in exchange for cash consideration of $290 million, which is expected to be paid in the first quarter of 2027.

Comcast Corporation

On September 12, 2023, we entered into a license purchase agreement (the “Comcast License Purchase Agreement”) with Comcast Corporation and its affiliate, Comcast OTR1, LLC (together with Comcast Corporation, “Comcast”), pursuant to which we will acquire spectrum in the 600 MHz band from Comcast (the “Comcast Licenses”) in exchange for total cash consideration of between $1.2 billion and $3.3 billion, subject to an application for FCC approval. The licenses will be acquired without any associated networks.

The final purchase price will be determined, in the aggregate and on a per license basis, based on the set of Comcast Licenses at the time the parties make required transfer filings with the FCC. Prior to the time of such filings, Comcast has the right to remove any or all of a certain specified subset of the Comcast Licenses, totaling $2.1 billion (the “Optional Sale Licenses”), from the Comcast License Purchase Agreement. The removal of any Optional Sale Licenses would reduce the final purchase price by the assigned value of each such license, from the maximum purchase price of $3.3 billion.

The Comcast Licenses are subject to an exclusive leasing arrangement between us and Comcast, which was entered into contemporaneously with the Comcast License Purchase Agreement. If Comcast elects to remove an Optional Sale License from the Comcast License Purchase Agreement, the associated lease for such Optional Sale License will terminate, but no sooner than two years from the date of the Comcast License Purchase Agreement (with us having a minimum period of time after any such termination to cease transmitting on such license’s associated spectrum).

On January 13, 2025, we and Comcast entered into an amendment to the Comcast License Purchase Agreement pursuant to which we will acquire additional spectrum. Subsequent to the amendment, the total cash consideration for the transaction is between $1.2 billion and $3.4 billion.

As a result of additional spectrum acquisitions we are planning with third parties, we have agreed with Comcast to accelerate the consummation of our acquisition of a portion of the Comcast Licenses. The accelerated portion of the Comcast Licenses acquisition closed on June 2, 2026, and the associated payment of $46 million was made on the same day. We are targeting a closing in the first half of 2028 for the acquisition of the remaining Comcast Licenses.

Grain Management, LLC

On May 30, 2025, we entered into a License and Unit Purchase Agreement with NEWLEVEL IV, L.P. and NEWLEVEL, LLC, both of which are affiliates of Grain Management, LLC (“Grain”), pursuant to which we agreed to sell our 800 MHz spectrum licenses in exchange for cash consideration and the receipt of Grain’s 600 MHz spectrum licenses, which we previously utilized under lease agreements with Grain. Following the receipt of certain regulatory approvals, including certain modifications to the 800 MHz spectrum licenses, on August 10, 2026, we completed the sale of our 800 MHz spectrum licenses in exchange for cash consideration of $2.9 billion and the receipt of Grain’s 600 MHz spectrum licenses valued at $690 million, for total consideration of $3.6 billion. We expect to pay approximately $850 million of cash income taxes primarily through December 31, 2027, related to the close of this transaction. In addition, we are entitled to receive a 50% share of future proceeds from transactions entered into by Grain that monetize the 800 MHz spectrum licenses, in excess of their invested capital, certain expenses and a specified return on their investment. On October 8, 2026, Grain entered into a purchase and sale agreement with Space Exploration Technologies Corp. for the sale of the 800 MHz spectrum licenses, subject to customary closing conditions and regulatory approvals. We have not recognized an associated gain for this potential additional consideration.

Spectrum Exchange Transactions

During the three months ended September 30, 2026, we recognized $501 million, and during the nine months ended September 30, 2026 and 2025, we recognized $549 million and $173 million, respectively, of non-cash spectrum license acquisitions associated with the closing of certain exchange transactions, which were included in Spectrum licenses on our Condensed Consolidated Balance Sheets. There were no non-cash spectrum license acquisitions during the three months ended September 30, 2025.

During the three months ended September 30, 2026, we recognized $14 million, and during the nine months ended September 30, 2026 and 2025, we recognized $38 million and $13 million, respectively, of gains associated with the closing of certain spectrum exchange transactions as a reduction to Selling, general and administrative expenses on our Condensed Consolidated Statements of Comprehensive Income. There were no gains or losses associated with spectrum exchange transactions during the three months ended September 30, 2025.

Restructuring Costs - Schedule of Restructuring Plan Expenses Incurred (Details) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2026 USD ($)	Sep. 30, 2026 USD ($)
Restructuring Cost and Reserve [Line Items]
Restructuring Incurred Cost Statement Of Income Or Comprehensive Income Extensible Enumeration Not Disclosed Flag	Total restructuring plan expenses	Total restructuring plan expenses
UScellular Acquisition Restructuring Initiatives
Restructuring Cost and Reserve [Line Items]
Total restructuring plan expenses	$ 39	$ 214
Incurred to Date	325	325
UScellular Acquisition Restructuring Initiatives \| Contract termination costs
Restructuring Cost and Reserve [Line Items]
Total restructuring plan expenses	19	111
Incurred to Date	143	143
UScellular Acquisition Restructuring Initiatives \| Severance costs
Restructuring Cost and Reserve [Line Items]
Total restructuring plan expenses	9	66
Incurred to Date	129	129
UScellular Acquisition Restructuring Initiatives \| Network decommissioning
Restructuring Cost and Reserve [Line Items]
Total restructuring plan expenses	11	37
Incurred to Date	53	53
Network Optimization Restructuring Initiatives
Restructuring Cost and Reserve [Line Items]
Total restructuring plan expenses	30	131
Incurred to Date	200	200
Network Optimization Restructuring Initiatives \| Contract termination costs
Restructuring Cost and Reserve [Line Items]
Total restructuring plan expenses	9	49
Incurred to Date	54	54
Network Optimization Restructuring Initiatives \| Network decommissioning
Restructuring Cost and Reserve [Line Items]
Total restructuring plan expenses	21	82
Incurred to Date	$ 146	$ 146

- Definition

Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

+ References + Details

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References + Details

Additional Financial Information - Schedule of Accounts Payable and Accrued Liabilities (Details) - USD ($) $ in Millions	Sep. 30, 2026	Dec. 31, 2025
Supplemental Financial Statement Elements [Abstract]
Accounts payable	$ 3,908	$ 5,219
Property and other taxes, including payroll	1,782	1,601
Payroll and related benefits	1,209	1,709
Accrued interest	1,063	1,025
Other accrued liabilities	662	726
Accounts payable and accrued liabilities	$ 8,624	$ 10,280

Receivables and Related Allowance for Credit Losses

9 Months Ended

Sep. 30, 2026

Receivables [Abstract]

Receivables and Related Allowance for Credit Losses

Note 4 – Receivables and Related Allowance for Credit Losses

We maintain an allowance for credit losses by applying an expected credit loss model. Each period, management assesses the appropriateness of the level of allowance for credit losses by considering credit risk inherent within each portfolio segment as of the end of the period.

We consider a receivable past due when a customer has not paid us by the contractually specified payment due date. Account balances are written off against the allowance for credit losses if collection efforts are unsuccessful and the receivable balance is deemed uncollectible (customer default), based on factors such as customer credit ratings, as well as the length of time the amounts are past due.

Our portfolio of receivables consists of two portfolio segments: accounts receivable and equipment installment plan (“EIP”) receivables.

Accounts Receivable Portfolio Segment

Accounts receivable balances are predominantly composed of amounts currently due from customers (e.g., for wireless communications services), device insurance administrators, wholesale partners, other carriers and third-party retail channels.

We estimate credit losses associated with our accounts receivable portfolio segment using an expected credit loss model, which utilizes an aging schedule methodology based on historical information and is adjusted for asset-specific considerations, current economic conditions and reasonable and supportable forecasts.

Our approach considers a number of factors, including our overall historical credit losses and payment experience, as well as current collection trends, such as write-off frequency and severity. We also consider other qualitative factors such as current and forecasted macroeconomic conditions.

We consider the need to adjust our estimate of credit losses for reasonable and supportable forecasts of future macroeconomic conditions. To do so, we monitor external forecasts of changes in real U.S. gross domestic product and forecasts of consumer credit behavior for comparable credit exposures.

EIP Receivables Portfolio Segment

At the time of device purchase, qualified customers can finance all or a portion of the individual device or accessory purchase price and associated taxes and fees over an installment period, generally of 24 or 36 months, using an EIP. Depending on the EIP the customer selects, an EIP is offered at zero interest or with a stated rate of interest, with the stated rate of interest dependent on customer credit quality.

Based upon customer credit profiles at the time of customer origination, as well as subsequent credit performance, we designate the EIP receivables segment into two customer classes of “Prime” and “Subprime.” Prime customer receivables are those with lower credit risk, and Subprime customer receivables are those with higher credit risk. Customers may be required to make a down payment on their equipment purchases if their assessed credit risk exceeds established underwriting thresholds. In addition, certain customers within the Subprime category may be required to pay a deposit.

To determine a customer’s credit profile and assist in determining their credit class, we use a proprietary credit scoring model that measures the credit quality of a customer leveraging several factors, such as credit bureau information and consumer credit risk scores, as well as service and device plan characteristics.

EIP receivables had a combined weighted-average effective interest rate of 10.9% and 10.3% as of September 30, 2026, and December 31, 2025, respectively.

The following table summarizes the EIP receivables, including unamortized discounts and related allowance for credit losses:


(in millions)	September 30, 2026		December 31, 2025


EIP receivables, gross	$	7,909	$	8,626
Unamortized discount	(552)		(566)
EIP receivables, net of unamortized discount	7,357		8,060
Allowance for credit losses	(370)		(380)
EIP receivables, net of allowance for credit losses and unamortized discount	$	6,987	$	7,680
Classified on our condensed consolidated balance sheets as:
Equipment installment plan receivables, net of allowance for credit losses and unamortized discount	$	4,530	$	4,997
Equipment installment plan receivables due after one year, net of allowance for credit losses and unamortized discount	2,457		2,683
EIP receivables, net of allowance for credit losses and unamortized discount	$	6,987	$	7,680

Many of our loss estimation techniques rely on delinquency-based models categorized by customer credit class; therefore, delinquency is an important indicator of credit quality in the establishment of our allowance for credit losses for EIP receivables. We manage our EIP receivables portfolio segment using delinquency and customer credit class as key credit quality indicators.

The following table presents the amortized cost of our EIP receivables by delinquency status, customer credit class and year of origination as of September 30, 2026:


	Originated in 2026				Originated in 2025				Originated prior to 2025				Total EIP Receivables, Net of Unamortized Discount
(in millions)	Prime		Subprime		Prime		Subprime		Prime		Subprime		Prime		Subprime		Total
Current - 30 days past due	$	3,589	$	696	$	2,182	$	411	$	247	$	38	$	6,018	$	1,145	$	7,163
31 - 60 days past due	25		23		17		15		3		2		45		40		85
61 - 90 days past due	13		16		12		12		2		1		27		29		56
More than 90 days past due	11		13		11		13		3		2		25		28		53
EIP receivables, net of unamortized discount	$	3,638	$	748	$	2,222	$	451	$	255	$	43	$	6,115	$	1,242	$	7,357

We estimate credit losses on our EIP receivables segment by applying an expected credit loss model, which relies on historical loss data adjusted for current conditions to calculate default probabilities or an estimate for the frequency of customer default. Our assessment of default probabilities or frequency includes receivables delinquency status, historical loss experience, how

long the receivables have been outstanding and customer credit ratings, as well as customer tenure. We multiply these estimated default probabilities by our estimated loss given default, which is the estimated amount of default or the severity of loss.

As we do for our accounts receivable portfolio segment, we consider the need to adjust our estimate of credit losses on EIP receivables for reasonable and supportable forecasts of economic conditions through monitoring external forecasts and periodic internal statistical analyses.

The following table presents write-offs of our EIP receivables by year of origination for the nine months ended September 30, 2026:


(in millions)	Originated in 2026		Originated in 2025		Originated prior to 2025		Total

Write-offs	$	175	$	388	$	93	$	656


	September 30, 2026						September 30, 2025
(in millions)	Accounts Receivable Allowance		EIP Receivables Allowance		Total		Accounts Receivable Allowance		EIP Receivables Allowance		Total
Allowance for credit losses and unamortized discount, beginning of period	$	226	$	946	$	1,172	$	176	$	814	$	990
Bad debt expense	615		646		1,261		478		447		925
Write-offs	(590)		(656)		(1,246)		(458)		(472)		(930)
Allowance for credit losses for acquired credit deteriorated receivables	—		—		—		10		78		88
Change in unamortized discount on short-term and long-term EIP receivables	N/A		127		127		N/A		100		100
Impact on the unamortized discount from sales of EIP receivables	N/A		(141)		(141)		N/A		(135)		(135)
Allowance for credit losses and unamortized discount, end of period	$	251	$	922	$	1,173	$	206	$	832	$	1,038

Off-Balance-Sheet Credit Exposures

We do not have material off-balance-sheet credit exposures as of September 30, 2026. In connection with the sales of certain service accounts receivable and EIP receivables pursuant to the sale arrangements, we provide guarantees of credit performance included on our Condensed Consolidated Balance Sheets measured at fair value that are based on a discounted cash flow model using Level 3 inputs, including estimated customer default rates and creditworthiness, dilutions and recoveries. See Note 5 – Sales of Certain Receivables for further information.

Earnings Per Share

9 Months Ended

Sep. 30, 2026

Earnings Per Share [Abstract]

Earnings Per Share

Note 13 – Earnings Per Share

The computation of basic and diluted earnings per share was as follows:


	Three Months Ended September 30,				Nine Months Ended September 30,
(in millions, except shares and per share amounts)	2026		2025		2026		2025
Net income	$	3,455	$	2,714	$	9,198	$	8,889

Weighted-average shares outstanding – basic (1)	1,070,648,134		1,123,754,096		1,084,089,790		1,133,743,367
Effect of dilutive securities:
Outstanding stock options and unvested stock awards (1)	982,300		2,873,612		1,386,893		3,177,154

Weighted-average shares outstanding – diluted	1,071,630,434		1,126,627,708		1,085,476,683		1,136,920,521

Earnings per share – basic	$	3.23	$	2.42	$	8.49	$	7.84
Earnings per share – diluted	$	3.22	$	2.41	$	8.47	$	7.82

Potentially dilutive securities:
Outstanding stock options and unvested stock awards	4,522,299		2,630,711		3,938,203		1,588,901

(1) Our calculations of the weighted-average number of shares issuable related to the Ka’ena Acquisition earnout (“Ka’ena Shares”) are based on the 20 trading day volume-weighted average price as of September 30, 2026 and 2025, respectively, as further described below.

As of September 30, 2026, we had authorized 100 million shares of preferred stock, with a par value of $0.00001 per share. There was no preferred stock outstanding as of September 30, 2026 and 2025. Potentially dilutive securities were not included in the computation of diluted earnings per share if to do so would have been anti-dilutive.

The Ka’ena Shares were previously contingent consideration for the Ka’ena Acquisition. On June 30, 2025, we amended the Merger and Unit Purchase Agreement to set the calculation of the earnout as the difference between the maximum purchase price of $1.35 billion and the upfront payment, as adjusted, and removed the requirement for Ka’ena to achieve specified performance indicators. The Ka’ena Shares issuable are included in the calculations of basic weighted-average shares outstanding for the three and nine months ended September 30, 2026, and the calculations of basic and diluted weighted-average shares outstanding for the three and nine months ended September 30, 2025. Subsequent to September 30, 2026, on October 9, 2026, 1,510,371 shares of T-Mobile common stock were issued as part of the satisfaction of our $420 million earnout obligation. See Note 2 – Business Combinations for additional information.

Debt - Schedule of Repayments (Details)	9 Months Ended
Debt - Schedule of Repayments (Details)	Sep. 30, 2026 USD ($)
Debt Instrument [Line Items]
Principal amount repaid	$ 406,000,000
Total redemptions, repayments and repurchases	9,165,000,000
Total redemptions	5,000,000
Total repayments	0
Write-off of Issuance Cost and Consent Fees	(21,000,000)
Total redemptions
Debt Instrument [Line Items]
Principal amount redeemed	7,500,000,000
Senior Notes
Debt Instrument [Line Items]
Principal amount repurchased	1,259,000,000
Total repurchases	$ (26,000,000)
Senior Notes \| 4.750% Senior Notes due 2028
Debt Instrument [Line Items]
Interest rate, stated percentage	4.75%
Principal amount redeemed	$ 1,500,000,000
Total redemptions	$ 3,000,000
Redemption price (percent)	100.00%
Senior Notes \| 4.750% Senior Notes to affiliates due 2028
Debt Instrument [Line Items]
Interest rate, stated percentage	4.75%
Principal amount redeemed	$ 1,500,000,000
Total redemptions	$ 2,000,000
Redemption price (percent)	100.00%
Senior Notes \| 1.500% Senior Notes due 2026
Debt Instrument [Line Items]
Interest rate, stated percentage	1.50%
Principal amount redeemed	$ 1,000,000,000
Total redemptions	$ 0
Senior Notes \| 2.250% Senior Notes due 2026
Debt Instrument [Line Items]
Interest rate, stated percentage	2.25%
Principal amount redeemed	$ 1,800,000,000
Total redemptions	$ 0
Senior Notes \| 5.050% Class A Senior ABS Notes due 2029
Debt Instrument [Line Items]
Interest rate, stated percentage	5.05%
Principal amount redeemed	$ 500,000,000
Total redemptions	$ 0
Redemption price (percent)	100.00%
Senior Notes \| 2.625% Senior Notes due 2026
Debt Instrument [Line Items]
Interest rate, stated percentage	2.625%
Principal amount redeemed	$ 1,200,000,000
Total redemptions	$ 0
Senior Notes \| 5.152% Series 2018-1 A-2 Notes due 2028
Debt Instrument [Line Items]
Interest rate, stated percentage	5.152%
Principal amount repaid	$ 275,000,000
Total repayments	0
Senior Notes \| Open market repurchases of our various Senior Notes
Debt Instrument [Line Items]
Principal amount repurchased	1,259,000,000
Total repurchases	(26,000,000)
Repurchase price	1,249,000,000
Loans Payable \| ECA Facility due March 2036
Debt Instrument [Line Items]
Principal amount repaid	87,000,000
Total repayments	0
Loans Payable \| ECA Facility due November 2036
Debt Instrument [Line Items]
Principal amount repaid	44,000,000
Total repayments	$ 0

Earnings Per Share (Tables)

9 Months Ended

Sep. 30, 2026

Earnings Per Share [Abstract]

Schedule of Computation of Basic and Diluted Earnings Per Share

The computation of basic and diluted earnings per share was as follows:


	Three Months Ended September 30,				Nine Months Ended September 30,
(in millions, except shares and per share amounts)	2026		2025		2026		2025
Net income	$	3,455	$	2,714	$	9,198	$	8,889

Weighted-average shares outstanding – basic (1)	1,070,648,134		1,123,754,096		1,084,089,790		1,133,743,367
Effect of dilutive securities:
Outstanding stock options and unvested stock awards (1)	982,300		2,873,612		1,386,893		3,177,154

Weighted-average shares outstanding – diluted	1,071,630,434		1,126,627,708		1,085,476,683		1,136,920,521

Earnings per share – basic	$	3.23	$	2.42	$	8.49	$	7.84
Earnings per share – diluted	$	3.22	$	2.41	$	8.47	$	7.82

Potentially dilutive securities:
Outstanding stock options and unvested stock awards	4,522,299		2,630,711		3,938,203		1,588,901

Debt (Tables)

9 Months Ended

Sep. 30, 2026

Debt Disclosure [Abstract]

Schedule of Debt Balances and Activity

The following table sets forth the debt balances and activity as of, and for the nine months ended, September 30, 2026:


(in millions)	December 31, 2025		Proceeds from Issuances and Borrowings		Redemptions, Repayments, and Repurchases (1)		Reclassifications (1)		Other (2)		September 30, 2026
Short-term debt	$	5,135	$	—	$	(4,962)	$	6,167	$	3	$	6,343
Long-term debt	79,649		6,891		(2,715)		(6,167)		(335)		77,323
Total debt to third parties	84,784		6,891		(7,677)		—		(332)		83,666

Long-term debt to affiliates	1,498		—		(1,498)		—		—		—
Total debt	$	86,282	$	6,891	$	(9,175)	$	—	$	(332)	$	83,666

(1)Note redemptions, repurchases and reclassifications are recorded net of accrued or paid issuance costs and discounts.

(2)Other includes the amortization of premiums, discounts, debt issuance costs and consent fees and the impact from changes in foreign currency exchange rates.

During the nine months ended September 30, 2026, we issued and borrowed the following debt:


(in millions)	Principal Issuances		Discounts and Issuance Costs		Net Proceeds from Issuance of Debt		Issue Date
5.000% Senior Notes due 2036	$	1,150	$	(8)	$	1,142	January 12, 2026
5.850% Senior Notes due 2056	850		(8)		842		January 12, 2026
3.200% Senior Notes due 2032 (EUR-denominated)	881		(5)		876		February 19, 2026
3.625% Senior Notes due 2035 (EUR-denominated)	881		(5)		876		February 19, 2026
3.900% Senior Notes due 2038 (EUR-denominated)	1,175		(12)		1,163		February 19, 2026
Total of Senior Notes issued	4,937		(38)		4,899
4.250% Class A Senior ABS Notes due 2030	500		(2)		498		March 20, 2026
4.740% Class A Senior ABS Notes due 2031	500		(2)		498		August 14, 2026
Total of ABS Notes issued	1,000		(4)		996


4.557% MRFA due 2027	1,000		(4)		996		February 5, 2026
Total borrowings	1,000		(4)		996
Total issuances and borrowings	$	6,937	$	(46)	$	6,891

Schedule of Repayments

During the nine months ended September 30, 2026, we made the following redemptions, repayments and repurchases:


(in millions)	Principal Amount		Write-off of Premium, Discount, Fees and Repurchase Gains / Losses (1)		Redemption, Repayment or Repurchase Date	Redemption or Repurchase Price
4.750% Senior Notes due 2028	$	1,500	$	3	February 1, 2026	100		%
4.750% Senior Notes to affiliates due 2028	1,500		2		February 1, 2026	100		%
1.500% Senior Notes due 2026	1,000		—		February 15, 2026	N/A
2.250% Senior Notes due 2026	1,800		—		February 15, 2026	N/A
5.050% Class A Senior ABS Notes due 2029	500		—		March 20, 2026	100		%
2.625% Senior Notes due 2026	1,200		—		April 15, 2026	N/A
Total redemptions	7,500		5

ECA Facility due March 2036	87		—		Various	N/A
5.152% Series 2018-1 A-2 Notes due 2028	275		—		Various	N/A
ECA Facility due November 2036	44		—		Various	N/A
Total repayments	406		—

Open market repurchases of our various Senior Notes (2)	1,259		(26)		Various	$	1,249
Total repurchases	1,259		(26)
Total redemptions, repayments and repurchases	$	9,165	$	(21)

Schedule of Maturities of ABS Notes

The expected maturities of our ABS Notes as of September 30, 2026, were as follows:


(in millions)	Expected Maturities
2026	$	136
2027	1,008
2028	985
2029	371
Total	$	2,500

Schedule of Variable Interest Entities

The following table summarizes the carrying amounts and classification of liabilities included on our Condensed Consolidated Balance Sheets with respect to the Service BRE:


(in millions)	September 30, 2026		December 31, 2025

Other current liabilities	$	298	$	306

The following table summarizes the carrying amounts and classification of assets and liabilities included on our Condensed Consolidated Balance Sheets with respect to the ABS Entities:


(in millions)	September 30, 2026		December 31, 2025

Assets
Equipment installment plan receivables, net	$	2,203	$	1,865
Equipment installment plan receivables due after one year, net	784		543
Other current assets	310		232
Liabilities
Accounts payable and accrued liabilities	$	3	$	3
Short-term debt	861		594
Long-term debt	1,632		1,401

- Definition

+ References + Details

Restructuring Costs - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025
UScellular Acquisition Restructuring Initiatives
Restructuring Cost and Reserve [Line Items]
Amortization of the right-of-use assets on lease contracts	$ 10	$ 0	$ 321	$ 0
Total restructuring plan expenses	39		214
UScellular Acquisition Restructuring Initiatives \| Network decommissioning
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, accelerated depreciation	0	$ 0	242	$ 0
Total restructuring plan expenses	11		37
Network Optimization Restructuring Initiatives
Restructuring Cost and Reserve [Line Items]
Total restructuring plan expenses	30		131
Network Optimization Restructuring Initiatives \| Network decommissioning
Restructuring Cost and Reserve [Line Items]
Total restructuring plan expenses	21		82
Retail Initiatives
Restructuring Cost and Reserve [Line Items]
Total restructuring plan expenses	31		133
Liabilities associated with retail initiatives	$ 40		$ 40

- Definition

Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

+ References + Details

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References + Details

Debt - Schedule of Issuances and Borrowings (Details) - USD ($) $ in Millions						9 Months Ended
	Aug. 14, 2026	Mar. 20, 2026	Feb. 19, 2026	Feb. 05, 2026	Jan. 12, 2026	Sep. 30, 2026
Debt Instrument [Line Items]
Principal Issuances						$ 6,937
Discounts and Issuance Costs						(46)
Net Proceeds from Issuance of Long-Term Debt						6,891
Senior Notes
Debt Instrument [Line Items]
Principal Issuances						4,937
Discounts and Issuance Costs						(38)
Net Proceeds from Issuance of Long-Term Debt						4,899
Senior Notes \| 5.000% Senior Notes due 2036
Debt Instrument [Line Items]
Interest rate, stated percentage					5.00%
Principal Issuances					$ 1,150
Discounts and Issuance Costs					(8)
Net Proceeds from Issuance of Long-Term Debt					$ 1,142
Senior Notes \| 5.850% Senior Notes due 2056
Debt Instrument [Line Items]
Interest rate, stated percentage					5.85%
Principal Issuances					$ 850
Discounts and Issuance Costs					(8)
Net Proceeds from Issuance of Long-Term Debt					$ 842
Senior Notes \| 3.200% Senior Notes due 2032
Debt Instrument [Line Items]
Interest rate, stated percentage			3.20%
Principal Issuances			$ 881
Discounts and Issuance Costs			(5)
Net Proceeds from Issuance of Long-Term Debt			$ 876
Senior Notes \| 3.625% Senior Notes due 2035
Debt Instrument [Line Items]
Interest rate, stated percentage			3.625%
Principal Issuances			$ 881
Discounts and Issuance Costs			(5)
Net Proceeds from Issuance of Long-Term Debt			$ 876
Senior Notes \| 3.900% Senior Notes due 2038
Debt Instrument [Line Items]
Interest rate, stated percentage			3.90%
Principal Issuances			$ 1,175
Discounts and Issuance Costs			(12)
Net Proceeds from Issuance of Long-Term Debt			$ 1,163
ABS Notes
Debt Instrument [Line Items]
Principal Issuances						1,000
Discounts and Issuance Costs						(4)
Net Proceeds from Issuance of Long-Term Debt						996
ABS Notes \| 4.250% Class A Senior ABS Notes due 2030
Debt Instrument [Line Items]
Interest rate, stated percentage		4.25%
Principal Issuances		$ 500
Discounts and Issuance Costs		(2)
Net Proceeds from Issuance of Long-Term Debt		$ 498
ABS Notes \| 4.740% Class A Senior ABS Notes due 2031
Debt Instrument [Line Items]
Interest rate, stated percentage	4.74%
Principal Issuances	$ 500
Discounts and Issuance Costs	(2)
Net Proceeds from Issuance of Long-Term Debt	$ 498
Borrowings
Debt Instrument [Line Items]
Principal Issuances						1,000
Discounts and Issuance Costs						(4)
Net Proceeds from Issuance of Long-Term Debt						$ 996
Borrowings \| 0.000% MRFA due 2027
Debt Instrument [Line Items]
Interest rate, stated percentage				4.557%
Principal Issuances				$ 1,000
Discounts and Issuance Costs				(4)
Net Proceeds from Issuance of Long-Term Debt				$ 996

Additional Financial Information - Narrative (Details) - USD ($) $ in Millions	Sep. 30, 2026	Dec. 31, 2025
Balance Sheet Location [Axis]: us-gaap:AccountsPayableAndAccruedLiabilitiesCurrent
Equity, Class of Treasury Stock [Line Items]
Outstanding checks	$ 394	$ 823

Business Combinations

9 Months Ended

Sep. 30, 2026

Business Combination, Asset Acquisition, Transaction between Entities under Common Control, and Joint Venture Formation [Abstract]

Business Combinations

Note 2 – Business Combinations

Acquisition of Ka’ena Corporation

On March 9, 2023, we entered into a merger and unit purchase agreement (the “Merger and Unit Purchase Agreement”) for the acquisition of 100% of the outstanding equity of Ka’ena Corporation and its subsidiaries, including, among others, Mint Mobile LLC (collectively, “Ka’ena”), for a maximum purchase price of $1.35 billion to be paid out 39% in cash and 61% in shares of T-Mobile common stock (the “Ka’ena Acquisition”). On March 13, 2024, we entered into Amendment No. 1 to the Merger and Unit Purchase Agreement, which amended, among other things, certain mechanics of the payment of the purchase consideration for the Ka’ena Acquisition, which resulted in a nominal increase in the percentage of cash compared to shares of T-Mobile common stock to be paid out as part of the total purchase price.

Upon the completion of certain customary closing conditions, including the receipt of certain regulatory approvals, on May 1, 2024 (the “Ka’ena Acquisition Date”), we completed the Ka’ena Acquisition, and as a result, Ka’ena became a wholly owned subsidiary of T-Mobile. Concurrently, and as agreed upon through the Merger and Unit Purchase Agreement, T-Mobile and Ka’ena entered into certain separate transactions, including the effective settlement of the preexisting wholesale arrangement between T-Mobile and Ka’ena and agreements with certain of the sellers to provide services to T-Mobile during the post-acquisition period.

In accordance with the terms of the Merger and Unit Purchase Agreement, the total purchase price consists of an upfront payment made on the Ka’ena Acquisition Date and an earnout, which was paid on October 9, 2026. On June 30, 2025, we amended the Merger and Unit Purchase Agreement to set the calculation of the earnout as the difference between the maximum purchase price of $1.35 billion and the upfront payment, as adjusted, and removed the requirement for Ka’ena to achieve specified performance indicators.

Based on the amount of the adjusted upfront payment, an additional $420 million in future cash and T-Mobile common stock is payable in satisfaction of the earnout, including the replacement of equity awards of certain Ka’ena employees, related to:

•$251 million for the acquired Ka’ena business; and

•$169 million for services provided to T-Mobile by certain sellers during the post-acquisition period.

As of September 30, 2026 and December 31, 2025, $251 million and $242 million, respectively, of liabilities for deferred earnout consideration for the acquired Ka’ena business and $169 million and $157 million, respectively, of liabilities for post-acquisition services are presented within current liabilities on our Condensed Consolidated Balance Sheets.

Subsequent to September 30, 2026, on October 9, 2026, we transferred $164 million in cash and 1,510,371 shares of T-Mobile common stock in satisfaction of our $420 million earnout obligation. The number of shares of T-Mobile common stock transferred was determined based on the 20 trading day volume-weighted average price as of October 6, 2026, and we withheld 102,164 shares for associated tax obligations.

Acquisition of UScellular Wireless Business

On May 24, 2024, we entered into a securities purchase agreement with United States Cellular Corporation (“UScellular”), Telephone and Data Systems, Inc. and USCC Wireless Holdings, LLC for the acquisition of substantially all of UScellular’s wireless operations and select AWS, PCS, 600 MHz, 700 MHz and other spectrum assets for an aggregate purchase price of approximately $4.4 billion, payable in cash and the assumption of up to $2.0 billion of debt through exchange offers to certain UScellular debtholders.

On May 23, 2025, we launched exchange offers (the “Exchange Offers”) for any and all of certain outstanding senior notes of UScellular for new notes of T-Mobile with the same interest rate, interest payment dates, maturity dates and redemption terms as each corresponding series of senior notes of UScellular.

On July 22, 2025, we entered into three separate asset purchase agreements for the acquisition of substantially all of the wireless operations assets (together with UScellular’s wireless operations and select spectrum assets, the “UScellular Wireless Business”) of each of Farmers Cellular Telephone Company, Inc., Iowa RSA No. 9 Limited Partnership and Iowa RSA No. 12 Limited Partnership (collectively, the “Iowa Entities”) for an aggregate purchase price of $175 million payable in cash. Prior to our acquisition of the Iowa Entities, UScellular held a minority interest in each of the Iowa Entities.

On August 1, 2025, upon the completion of certain customary closing conditions, including the receipt of certain regulatory approvals (the “UScellular Acquisition Date”), we completed the acquisition of the UScellular Wireless Business (the “UScellular Acquisition”), and as a result, the UScellular Wireless Business became wholly owned by T-Mobile. In exchange, on the UScellular Acquisition Date, we transferred cash of $2.8 billion. Additionally, the closing of the UScellular Acquisition obligated us to execute the Exchange Offers. UScellular senior notes with an aggregate outstanding principal balance of $1.7 billion were subsequently exchanged for T-Mobile notes in the Exchange Offers on August 5, 2025. The obligation to execute the Exchange Offers was recorded as debt assumed in the UScellular Acquisition with an aggregate assigned fair value of $1.7 billion.

Consideration Transferred

The acquisition-date fair value of consideration transferred in the UScellular Acquisition is comprised of the following:


(in millions)	August 1, 2025
Fair value of cash paid on the UScellular Acquisition Date, as adjusted	$	2,770
Fair value of T-Mobile replacement equity awards attributable to pre-combination service	44
Total fair value of consideration exchanged	$	2,814

Fair Value of Assets Acquired and Liabilities Assumed

We accounted for the UScellular Acquisition as a business combination. The identifiable assets acquired and liabilities assumed of the UScellular Wireless Business were recorded at their fair values as of the UScellular Acquisition Date and consolidated with those of T-Mobile. Assigning fair values to the assets acquired and liabilities assumed at the UScellular Acquisition Date required the use of judgment regarding estimates and assumptions. For the fair values of the assets acquired and liabilities assumed, we used the cost, income and market approaches.


(in millions)	August 1, 2025
Cash and cash equivalents	$	12
Accounts receivable	317
Equipment installment plan receivables	503
Inventory	129
Prepaid expenses	63
Other current assets	33
Property and equipment	1,451
Operating lease right-of-use assets (1)	1,199
Goodwill	206
Spectrum licenses	1,730
Other intangible assets	407
Equipment installment plan receivables due after one year	388
Deferred tax assets	23
Other assets	125
Total assets acquired	6,586
Accounts payable and accrued liabilities	295
Deferred revenue	275
Short-term operating lease liabilities (1)	179
Other current liabilities	114
Long-term debt (2)	1,653
Operating lease liabilities (1)	1,029
Other long-term liabilities	227
Total liabilities assumed	3,772
Total consideration transferred	$	2,814

(2)The obligation to execute the Exchange Offers was recorded as debt assumed in the UScellular Acquisition with an aggregate assigned fair value of $1.7 billion.

Intangible Assets

Goodwill was assigned to our Wireless segment and has an assigned value of $206 million, which represents the excess of the consideration transferred over the fair values of assets acquired and liabilities assumed. The assigned goodwill recognized includes synergies expected to be achieved from the operations of the combined company, the assembled workforce of UScellular and intangible assets that do not qualify for separate recognition. Of the total assigned amount of goodwill resulting from the UScellular Acquisition of $206 million, the amount deductible for tax purposes is $181 million. Expected synergies from the UScellular Acquisition include the cost savings from the planned integration of network infrastructure, facilities, personnel and systems.

Acquisition of Vistar Media Inc.

On December 20, 2024, we entered into an agreement and plan of merger for the acquisition of 100% of the outstanding capital stock of Vistar Media Inc. (“Vistar”), a provider of technology solutions for digital-out-of-home advertisements (the “Vistar Acquisition”).

Upon the completion of certain customary closing conditions, including the receipt of certain regulatory approvals, on February 3, 2025 (the “Vistar Acquisition Date”), we completed the Vistar Acquisition, and as a result, Vistar became a wholly owned subsidiary of T-Mobile. In exchange, we transferred cash of $621 million. A portion of the payment made on the Vistar Acquisition Date was for the settlement of preexisting relationships with Vistar and is excluded from the fair value of consideration transferred.

Fair Value of Assets Acquired and Liabilities Assumed

We have accounted for the Vistar Acquisition as a business combination. The identifiable assets acquired and liabilities assumed from Vistar were recorded at their fair values as of the Vistar Acquisition Date and consolidated with those of T-Mobile. Assigning fair values to the assets acquired and liabilities assumed at the Vistar Acquisition Date required the use of judgment regarding estimates and assumptions. For the fair values of the assets acquired and liabilities assumed, we used the cost and income approaches.


(in millions)	February 3, 2025
Cash and cash equivalents	$	42
Accounts receivable	157


Prepaid expense and other current assets	2
Property and equipment	1
Operating lease right-of-use assets	1
Goodwill	341
Other intangible assets	264

Total assets acquired	808
Accounts payable and accrued liabilities	128
Deferred revenue	1
Deferred tax liabilities	59
Operating lease liabilities	2

Total liabilities assumed	190
Total consideration transferred	$	618

Acquisition of Blis Holdco Limited

On February 18, 2025, we entered into a share purchase agreement for the acquisition of 100% of the outstanding capital stock of Blis Holdco Limited (“Blis”), a provider of advertising solutions (the “Blis Acquisition”).

Upon the completion of certain customary closing conditions, including the receipt of certain regulatory approvals, on March 3, 2025 (the “Blis Acquisition Date”), we completed the Blis Acquisition, and as a result, Blis became a wholly owned subsidiary of T-Mobile. In exchange, we transferred cash of $180 million. A portion of the payment made on the Blis Acquisition Date was for the settlement of preexisting relationships with Blis and is excluded from the fair value of consideration transferred.

We have accounted for the Blis Acquisition as a business combination. The fair value of consideration transferred as of the Blis Acquisition Date totaled $174 million. The identifiable assets acquired and liabilities assumed from Blis were recorded at their fair values as of the Blis Acquisition Date and consolidated with those of T-Mobile. The assigned fair values of total assets acquired were $263 million, including goodwill of $103 million, and total liabilities assumed were $89 million at the Blis Acquisition Date. These amounts reflect immaterial adjustments based on information identified during the measurement period, which closed on March 2, 2026.

- Definition

The entire disclosure for business combination.

+ References

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+ Details

Condensed Consolidated Statements of Cash Flows (Parenthetical) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025
Statement of Cash Flows [Abstract]
Capitalized interest	$ (7)	$ (13)	$ (20)	$ (33)

Condensed Consolidated Statements of Cash Flows - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025
Operating activities
Net income	$ 3,455	$ 2,714	$ 9,198	$ 8,889
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation and amortization	3,452	3,408	10,703	9,752
Stock-based compensation expense	197	227	620	613
Deferred income tax expense	637	797	2,212	2,505
Bad debt expense	437	337	1,261	925
Losses from sales of receivables	15	17	52	58
Impairment expense	0	278	0	278
Changes in operating assets and liabilities
Accounts receivable	(9)	(366)	(669)	(797)
Equipment installment plan receivables	(9)	44	39	133
Inventory	(892)	(537)	(664)	(591)
Operating lease right-of-use assets	969	929	3,130	2,667
Other current and long-term assets	(122)	(322)	(443)	(983)
Accounts payable and accrued liabilities	(421)	890	(1,094)	729
Short- and long-term operating lease liabilities	(979)	(936)	(3,173)	(2,720)
Other current and long-term liabilities	334	(239)	222	(409)
Other, net	277	216	669	247
Net cash provided by operating activities	7,341	7,457	22,063	21,296
Investing activities
Purchases of property and equipment, including capitalized interest of $(7), $(13), $(20) and $(33)	(2,270)	(2,639)	(7,596)	(7,486)
Purchases of spectrum licenses and other intangible assets, including deposits	(324)	(1,590)	(834)	(2,505)
Proceeds from the sale of property, equipment and intangible assets	2,927	18	3,038	2,091
Acquisition of companies, net of cash acquired	0	(2,797)	(1)	(3,523)
Investments in unconsolidated affiliates, net	4	(3,072)	1	(4,055)
Other, net	21	(59)	(151)	371
Net cash provided by (used in) investing activities	358	(10,139)	(5,543)	(15,107)
Financing activities
Proceeds from issuance of long-term debt, net	498	498	6,891	8,266
Repayments of financing lease obligations	(331)	(318)	(995)	(964)
Repayments of long-term debt	(1,367)	(828)	(9,138)	(4,564)
Repurchases of common stock	(2,418)	(2,479)	(9,564)	(7,528)
Dividends on common stock	(1,089)	(987)	(3,310)	(2,986)
Tax withholdings on share-based awards	(86)	(92)	(271)	(394)
Other, net	(55)	(32)	(83)	(80)
Net cash used in financing activities	(4,848)	(4,238)	(16,470)	(8,250)
Effect of exchange rate changes on cash and cash equivalents, including restricted cash	0	0	0	13
Change in cash and cash equivalents, including restricted cash	2,851	(6,920)	50	(2,048)
Cash and cash equivalents, including restricted cash
Beginning of period	3,175	10,585	5,976	5,713
End of period	$ 6,026	$ 3,665	$ 6,026	$ 3,665

Earnings Per Share - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions	Oct. 09, 2026	Jun. 30, 2025	Mar. 09, 2023	Sep. 30, 2026	Sep. 30, 2025
Ka Ena Corporation \| Subsequent Event
Class of Stock [Line Items]
Business acquisition, equity transferred for earnout obligation (in shares)	1,510,371
Ka Ena Corporation \| Merger And Unit Purchase Agreement
Class of Stock [Line Items]
Total consideration transferred		$ 1,350	$ 1,350
Mandatory Convertible Preferred Stock Series A
Class of Stock [Line Items]
Preferred shares authorized (in shares)				100,000,000
Preferred stock, par value (in USD per share)				$ 0.00001
Preferred shares outstanding (in shares)				0	0

Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Sep. 30, 2026	Dec. 31, 2025
Statement of Financial Position [Abstract]
Allowance for credit losses	$ 251	$ 226
Allowance for credit losses and unamortized discount current	723	733
Allowance for credit losses and unamortized discount noncurrent	$ 199	$ 213
Common stock, par value (in USD per share)	$ 0.00001	$ 0.00001
Common stock, shares authorized (in shares)	2,000,000,000	2,000,000,000
Common stock, shares issued (in shares)	1,280,056,882	1,275,774,235
Common stock, shares outstanding (in shares)	1,062,845,266	1,106,930,661
Treasury stock, at cost (in shares)	217,211,616	168,843,574

- Definition

Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

+ References

+ Details

Summary of Significant Accounting Policies (Policies)	9 Months Ended
Summary of Significant Accounting Policies (Policies)	Sep. 30, 2026
Accounting Policies [Abstract]
Consolidation	The unaudited condensed consolidated financial statements of T-Mobile US, Inc. (“T-Mobile,” “we,” “our,” “us” or the “Company”) include all adjustments of a normal recurring nature necessary for the fair presentation of the results for the interim periods presented. The results for the interim periods are not necessarily indicative of those for the full year. The condensed consolidated financial statements should be read in conjunction with our consolidated financial statements included in our Annual Report on Form 10-K for the year ended December 31, 2025. The condensed consolidated financial statements include the balances and results of operations of T-Mobile and our consolidated subsidiaries. We consolidate majority-owned subsidiaries over which we exercise control, variable interest entities (“VIEs”) for which we are deemed to be the primary beneficiary and VIEs which cannot be deconsolidated, such as those related to our tower obligations as discussed in Note 9 – Tower Obligations. Intercompany transactions and balances have been eliminated in consolidation. Investments in entities that we do not control but have significant influence are accounted for under the equity method. We record our proportionate share of our equity method investees’ earnings (losses) within Other expense, net on our Condensed Consolidated Statements of Comprehensive Income.
Basis of Accounting	The preparation of financial statements in conformity with United States (“U.S.”) generally accepted accounting principles (“GAAP”) requires our management to make estimates and assumptions that affect the financial statements and accompanying notes.
Use of Estimates	Estimates are based on historical experience, where applicable, and other assumptions that management believes are reasonable under the circumstances. Estimates are inherently subject to judgment and actual results could differ from those estimates.
Accounting Pronouncements Adopted During the Current Year and Accounting Pronouncements Not Yet Adopted	Accounting Pronouncements Adopted During the Current Year Interim Reporting In December 2025, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2025-11, “Interim Reporting (Topic 270): Narrow-Scope Improvements.” The standard improves the navigability of interim disclosures, clarifies when Topic 270 applies and provides additional interim disclosure guidance, including a principle to disclose material events since the most recent annual reporting period. The amendments do not change the underlying objectives of interim reporting but are designed to enhance clarity in application. We evaluated this standard and concluded our interim reporting disclosures are consistent with this standard. Accordingly, the adoption of this standard in the first quarter of 2026 did not have a material impact on our interim reporting disclosures. Internal-Use Software Accounting and Disclosures In September 2025, the FASB issued ASU 2025-06, “Intangibles—Goodwill and Other—Internal-Use Software (Subtopic 350-40): Targeted Improvements to the Accounting for Internal-Use Software.” The amendments remove all references to project stages in ASC 350-40, clarify the threshold entities apply to begin capitalizing costs and address challenges arising from the evolution of software development practices. The new guidance modernizes accounting for software developed using incremental and iterative methods, where the existing model provided limited direction on when capitalization should begin. The ASU also specifies that the disclosures under ASC 360-10, “Property, Plant, and Equipment—Overall,” apply to capitalized software costs accounted for under ASC 350-40, regardless of how those costs are presented in the financial statements. As of January 1, 2026, we have adopted this standard, and it was applied prospectively after this date. The adoption of this standard did not have a material impact on our condensed consolidated financial statements and related disclosures. Accounting Pronouncements Not Yet Adopted Disaggregation of Income Statement Expenses In November 2024, the FASB issued ASU 2024-03, “Income Statement—Reporting Comprehensive Income—Expense Disaggregation Disclosures (Subtopic 220-40): Disaggregation of Income Statement Expenses.” The standard requires that public business entities disclose additional information about specific expense categories in the notes to financial statements for interim and annual reporting periods. The standard will become effective for us for our fiscal year 2027 annual financial statements and interim financial statements thereafter and may be applied prospectively to periods after the adoption date or retrospectively for all prior periods presented in the financial statements, with early adoption permitted. We plan to adopt the standard when it becomes effective for us beginning in our fiscal year 2027 annual financial statements, and we are currently evaluating the impact this guidance will have on the disclosures included in the Notes to the Consolidated Financial Statements.

- Definition

Disclosure of accounting policy for the use of estimates in the preparation of financial statements in conformity with generally accepted accounting principles.

+ References

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+ Details

Subsequent Events	9 Months Ended
Subsequent Events	Sep. 30, 2026
Subsequent Events [Abstract]
Subsequent Events	Note 17 – Subsequent Events On October 1, 2026, we completed the joint acquisition of i3 Broadband. See Note 3 – Joint Ventures for additional information. On October 9, 2026, we transferred $164 million in cash and 1,510,371 shares of T-Mobile common stock in satisfaction of our $420 million Ka’ena Acquisition earnout obligation. See Note 2 – Business Combinations for additional information. From October 1, 2026, through October 23, 2026, we repurchased 4,987,500 shares of our common stock at an average price per share of $158.68 for a total purchase price of $791 million. See Note 12 – Stockholder Return Program for additional information.

Tower Obligations

9 Months Ended

Sep. 30, 2026

Leases [Abstract]

Tower Obligations

Note 9 – Tower Obligations

Existing CCI Tower Lease Arrangements

In 2012, we conveyed to Crown Castle International Corp. (“CCI”) the exclusive right to manage and operate approximately 6,200 tower sites (“CCI Lease Sites”) via a master prepaid lease with site lease terms ranging from 23 to 37 years. CCI has fixed-price purchase options for the CCI Lease Sites totaling approximately $2.0 billion, exercisable annually on a per-tranche basis at the end of the lease term during the period from December 31, 2035, through December 31, 2049. If CCI exercises its purchase option for any tranche, it must purchase all the towers in the tranche. We lease back a portion of the space at certain tower sites.

Assets and liabilities associated with the operation of the tower sites were transferred to special purpose entities (“SPEs”). Assets included ground lease agreements or deeds for the land on which the towers are situated, the towers themselves and existing subleasing agreements with other mobile network operator tenants that lease space at the tower sites. Liabilities included the obligation to pay ground lease rentals, property taxes and other executory costs.

We determined the SPEs containing the CCI Lease Sites (“Lease Site SPEs”) are VIEs as they lack sufficient equity to finance their activities. We have a variable interest in the Lease Site SPEs but are not the primary beneficiary as we lack the power to direct the activities that most significantly impact the Lease Site SPEs’ economic performance. These activities include managing tenants and underlying ground leases, performing repair and maintenance on the towers, the obligation to absorb expected losses and the right to receive the expected future residual returns from the purchase option to acquire the CCI Lease Sites. As we determined that we are not the primary beneficiary and do not have a controlling financial interest in the Lease Site SPEs, the Lease Site SPEs are not included on our condensed consolidated financial statements.

However, we also considered if this arrangement resulted in the sale of the CCI Lease Sites for which we would derecognize the tower assets. By assessing whether control had transferred, we concluded that transfer of control criteria, as discussed in the revenue standard, were not met. Accordingly, we recorded this arrangement as a financing whereby we recorded debt, a financial obligation, and the CCI Lease Sites tower assets remained on our Condensed Consolidated Balance Sheets. We recorded long-term financial obligations in the amount of the net proceeds received and recognize interest on the tower obligations. The tower obligations are increased by interest expense and amortized through contractual leaseback payments made by us to CCI and through net cash flows generated and retained by CCI from the operation of the tower sites.

Acquired CCI Tower Lease Arrangements

Prior to our merger (the “Sprint Merger”) with Sprint Corporation (“Sprint”), Sprint entered into a lease-out and leaseback arrangement with Global Signal Inc., a third party that was subsequently acquired by CCI, that conveyed to CCI the exclusive right to manage and operate approximately 6,400 tower sites (“Master Lease Sites”) via a master prepaid lease. These agreements were assumed upon the close of the Sprint Merger, at which point the remaining term of the lease-out was approximately 17 years with no renewal options. CCI has a fixed price purchase option for all (but not less than all) of the leased or subleased sites for approximately $2.3 billion, exercisable one year prior to the expiration of the agreement and ending 120 days prior to the expiration of the agreement. We lease back a portion of the space at certain tower sites.

We considered if this arrangement resulted in the sale of the Master Lease Sites for which we would derecognize the tower assets. By assessing whether control had transferred, we concluded that transfer of control criteria, as discussed in the revenue standard, were not met. Accordingly, we recorded this arrangement as a financing whereby we recorded debt, a financial obligation, and the Master Lease Sites tower assets remained on our Condensed Consolidated Balance Sheets.

We recognize interest expense on the tower obligations. The tower obligations are increased by the interest expense and amortized through contractual leaseback payments made by us to CCI. The tower assets are reported in Property and

equipment, net on our Condensed Consolidated Balance Sheets and are depreciated to their estimated residual values over the expected useful life of the towers, which is 20 years.

Leaseback Arrangement

On January 3, 2022, we entered into an agreement (the “Crown Agreement”) with CCI. The Crown Agreement extends the current term of the leasebacks by up to 12 years and modifies the leaseback payments for both the Existing CCI Tower Lease Arrangements and the Acquired CCI Tower Lease Arrangements. As a result of the Crown Agreement, there was an increase in our financing obligation as of the effective date of the Crown Agreement of approximately $1.2 billion, with a corresponding decrease to Other long-term liabilities associated with unfavorable contract terms. The modification resulted in a revised interest rate under the effective interest method for the tower obligations: 11.6% for the Existing CCI Tower Lease Arrangements and 5.3% for the Acquired CCI Tower Lease Arrangements. There were no changes made to either of our master prepaid leases with CCI.

The following table summarizes the balances associated with both of the tower arrangements on our Condensed Consolidated Balance Sheets:


(in millions)	September 30, 2026		December 31, 2025
Property and equipment, net	$	1,815	$	1,922
Tower obligations	3,419		3,532
Other long-term liabilities	554		554

Future minimum payments related to the tower obligations are approximately $396 million for the 12-month period ending September 30, 2027, $829 million in total for both of the 12-month periods ending September 30, 2028 and 2029, $883 million in total for both of the 12-month periods ending September 30, 2030 and 2031, and $2.9 billion in total thereafter.

We are contingently liable for future ground lease payments through the remaining term of the CCI Lease Sites and the Master Lease Sites. These contingent obligations are not included in Operating lease liabilities, as any amount due is contractually owed by CCI based on the subleasing arrangement. Under the arrangement, we remain primarily liable for ground lease payments on approximately 850 sites and have included lease liabilities of $233 million in our Operating lease liabilities as of September 30, 2026.

Insider Trading Arrangements	3 Months Ended
Insider Trading Arrangements	Sep. 30, 2026
Trading Arrangements, by Individual
Rule 10b5-1 Arrangement Adopted	false
Non-Rule 10b5-1 Arrangement Adopted	false
Rule 10b5-1 Arrangement Terminated	false
Non-Rule 10b5-1 Arrangement Terminated	false

Condensed Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025
Income Statement [Abstract]
Cash flow hedges, tax effect	$ 18	$ 16	$ 52	$ 48
Fair value hedges, tax effect	9	(7)	45	(55)
Unrealized loss on foreign currency translation adjustment, tax	1	0	1	0
Pension and other postretirement benefit, tax	$ (13)	$ 0	$ (14)	$ (1)

Restructuring Costs - Schedule of expenses incurred in connection (Details) - Severance costs - 2025-2026 Workforce Transformation $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2026 USD ($)	Sep. 30, 2026 USD ($)
Restructuring Cost and Reserve [Line Items]
Total restructuring plan expenses	$ 0	$ 141
Incurred to Date	$ 531	$ 531

- Definition

Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

+ References + Details

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References + Details

Fair Value Measurements (Tables)

9 Months Ended

Sep. 30, 2026

Fair Value Disclosures [Abstract]

Schedule of Cross Currency Swaps

The following table summarizes the activity of our cross-currency swaps:


	Three Months Ended September 30,				Nine Months Ended September 30,

(in millions)	2026		2025		2026		2025

Other expense, net
Pre-tax transaction gain (loss) on remeasurement of EUR-denominated debt	$	28	$	25	$	287	$	(654)
Amount recognized in Other expense, net reclassified from Accumulated other comprehensive loss	(28)		(25)		(287)		654
Accumulated other comprehensive loss
Amount recognized in Accumulated other comprehensive loss reclassified to Other expense, net	$	28	$	25	$	287	$	(654)
Gain (loss) associated with the change in fair value of cross-currency swaps recognized in Accumulated other comprehensive loss	8		(52)		(109)		439

Schedule of Carrying Values and Fair Values of Short-Term and Long-term Debt

The carrying amounts and fair values of our short-term and long-term debt, excluding accrued interest, included on our Condensed Consolidated Balance Sheets were as follows:


(in millions)	Level within the Fair Value Hierarchy	September 30, 2026				December 31, 2025
		Carrying Amount		Fair Value		Carrying Amount		Fair Value
Liabilities:
Senior Notes to third parties	1	$	69,738	$	60,959	$	74,575	$	70,517
Senior Notes to third parties (EUR-denominated)	2	8,183		7,669		5,551		5,460
Senior Notes to affiliates	2	—		—		1,498		1,500
Senior Secured Notes to third parties	1	559		551		844		835
ABS Notes to third parties	2	2,493		2,487		1,995		2,017
Borrowings related to ECA Facilities and MRFA	2	2,693		2,746		1,819		1,876

Earnings Per Share - Schedule of Computation of Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025
Earnings Per Share [Abstract]
Net income	$ 3,455	$ 2,714	$ 9,198	$ 8,889
Weighted-average shares outstanding - basic (in shares)	1,070,648,134	1,123,754,096	1,084,089,790	1,133,743,367
Effect of dilutive securities:
Outstanding stock options and unvested stock awards (in shares)	982,300	2,873,612	1,386,893	3,177,154
Weighted-average shares outstanding - diluted (in shares)	1,071,630,434	1,126,627,708	1,085,476,683	1,136,920,521
Earnings per share - basic (in USD per share)	$ 3.23	$ 2.42	$ 8.49	$ 7.84
Earnings per share - diluted (in USD per share)	$ 3.22	$ 2.41	$ 8.47	$ 7.82
Outstanding stock options and unvested stock awards
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potentially dilutive securities (in shares)	4,522,299	2,630,711	3,938,203	1,588,901

Fair Value Measurements - Schedule of Pretax Cross Currency Swaps (Details) - Cross-Currency Swap - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Pre-tax transaction gain (loss) on remeasurement of EUR-denominated debt	$ 28	$ 25	$ 287	$ (654)
Amount recognized in Other expense, net reclassified from Accumulated other comprehensive loss	(28)	(25)	(287)	654
Gain (loss) associated with the change in fair value of cross-currency swaps recognized in Accumulated other comprehensive loss	8	(52)	(109)	439
Reclassification out of Accumulated Other Comprehensive Income
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Amount recognized in Accumulated other comprehensive loss reclassified to Other expense, net	$ 28	$ 25	$ 287	$ (654)

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References + Details

Revenue from Contracts with Customers - Remaining Performance Obligations (Details)	Sep. 30, 2026
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-10-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation, expected timing of satisfaction, period	3 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2027-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation, expected timing of satisfaction, period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2028-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation, expected timing of satisfaction, period

Stockholder Return Program	9 Months Ended
Stockholder Return Program	Sep. 30, 2026
Equity [Abstract]
Stockholder Return Program	Note 12 – Stockholder Return Program 2026 Stockholder Return Program On December 11, 2025, we announced that our Board of Directors authorized our 2026 Stockholder Return Program of up to $14.6 billion that will run through December 31, 2026 (the “2026 Stockholder Return Program”). On April 23, 2026, we announced that our Board of Directors increased the 2026 Stockholder Return Program authorization to up to $18.2 billion. The 2026 Stockholder Return Program consists of repurchases of shares of our common stock and the payment of cash dividends. The amount available under the 2026 Stockholder Return Program for share repurchases will be reduced by the amount of any cash dividends declared and paid by us. On December 4, 2025, our Board of Directors declared a cash dividend of $1.02 per share on our issued and outstanding common stock, which was paid on March 12, 2026, to stockholders of record as of the close of business on February 27, 2026. On March 19, 2026, our Board of Directors declared a cash dividend of $1.02 per share on our issued and outstanding common stock, which was paid on June 11, 2026, to stockholders of record as of the close of business on May 29, 2026. On June 15, 2026, our Board of Directors declared a cash dividend of $1.02 per share on our issued and outstanding common stock, which was paid on September 10, 2026, to stockholders of record as of the close of business on August 28, 2026. On September 24, 2026, our Board of Directors declared a cash dividend of $1.17 per share on our issued and outstanding common stock, which will be paid on December 10, 2026, to stockholders of record as of the close of business on November 25, 2026. During the three and nine months ended September 30, 2026, we paid an aggregate of $1.1 billion and $3.3 billion, respectively, in cash dividends to our stockholders, which are presented within Net cash used in financing activities on our Condensed Consolidated Statements of Cash Flows, of which during the three and nine months ended September 30, 2026, $594 million and $1.8 billion, respectively, were paid to Deutsche Telekom AG (“DT”). As of September 30, 2026, $1.2 billion for dividends payable is presented within Other current liabilities on our Condensed Consolidated Balance Sheets, of which $681 million is payable to DT. During the three months ended September 30, 2026, we repurchased 13,621,695 shares of our common stock at an average price per share of $177.31 for a total purchase price of $2.4 billion, and during the nine months ended September 30, 2026, we repurchased 48,372,465 shares of our common stock at an average price per share of $195.81 for a total purchase price of $9.5 billion under the 2026 Stockholder Return Program. All shares repurchased during the three and nine months ended September 30, 2026, were purchased at market price. As of September 30, 2026, we had up to $5.4 billion remaining under the 2026 Stockholder Return Program for repurchases of shares and quarterly dividends through December 31, 2026. Subsequent to September 30, 2026, from October 1, 2026, through October 23, 2026, we repurchased 4,987,500 shares of our common stock at an average price per share of $158.68 for a total purchase price of $791 million. As of October 23, 2026, we had up to $4.6 billion remaining under the 2026 Stockholder Return Program for repurchases of shares and quarterly dividends through December 31, 2026.