T-Mobile US (TMUS) 10-K 31 Jan 25 2024 FY Annual report Financial data

Cover Page

Cover Page - USD ($) $ in Billions	12 Months Ended
	Dec. 31, 2024	Jan. 24, 2025	Jun. 28, 2024
Entity Listings [Line Items]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2024
Current Fiscal Year End Date	--12-31
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 Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
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
ICFR Auditor Attestation Flag	true
Document Financial Statement Error Correction [Flag]	false
Entity Shell Company	false
Entity Public Float			$ 86
Entity Common Stock, Shares Outstanding (in shares)		1,141,744,952
Documents Incorporated by Reference	Part III of this Annual Report on Form 10-K will be incorporated by reference from certain portions of the definitive Proxy Statement for the Registrant’s 2025 Annual Meeting of Stockholders, which definitive Proxy Statement will be filed with the Securities and Exchange Commission pursuant to Regulation 14A or will be included in an amendment to this Report.
Entity Central Index Key	0001283699
Amendment Flag	false
Document Fiscal Year Focus	2024
Document Fiscal Period Focus	FY
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
3.850% 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

Audit Information

Audit Information	12 Months Ended
	Dec. 31, 2024
Audit Information [Abstract]
Auditor Name	Deloitte & Touche LLP
Auditor Location	Seattle, Washington
Auditor Firm ID	34

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Current assets
Cash and cash equivalents	$ 5,409	$ 5,135
Accounts receivable, net of allowance for credit losses of $176 and $161	4,276	4,692
Equipment installment plan receivables, net of allowance for credit losses and imputed discount of $656 and $623	4,379	4,456
Inventory	1,607	1,678
Prepaid expenses	880	702
Other current assets	1,853	2,352
Total current assets	18,404	19,015
Property and equipment, net	38,533	40,432
Operating lease right-of-use assets	25,398	27,135
Financing lease right-of-use assets	3,091	3,270
Goodwill	13,005	12,234
Spectrum licenses	100,558	96,707
Other intangible assets, net	2,512	2,618
Equipment installment plan receivables due after one year, net of allowance for credit losses and imputed discount of $158 and $150	2,209	2,042
Other assets	4,325	4,229
Total assets	208,035	207,682
Current liabilities
Accounts payable and accrued liabilities	8,463	10,373
Short-term debt	4,068	3,619
Deferred revenue	1,222	825
Short-term operating lease liabilities	3,281	3,555
Short-term financing lease liabilities	1,175	1,260
Other current liabilities	1,965	1,296
Total current liabilities	20,174	20,928
Long-term debt	74,197	71,399
Tower obligations	3,664	3,777
Deferred tax liabilities	16,700	13,458
Operating lease liabilities	26,408	28,240
Financing lease liabilities	1,151	1,236
Other long-term liabilities	4,000	3,929
Total long-term liabilities	126,120	122,039
Commitments and contingencies (Note 18)
Stockholders' equity
Common stock, par value $0.00001 per share, 2,000,000,000 shares authorized; 1,271,074,364 and 1,262,904,154 shares issued, 1,144,579,681 and 1,195,807,331 shares outstanding	0	0
Additional paid-in capital	68,798	67,705
Treasury stock, at cost, 126,494,683 and 67,096,823 shares	(20,584)	(9,373)
Accumulated other comprehensive loss	(857)	(964)
Retained earnings	14,384	7,347
Total stockholders' equity	61,741	64,715
Total liabilities and stockholders' equity	208,035	207,682
Nonrelated Party
Current liabilities
Long-term debt	72,700	69,903
Related Party
Current liabilities
Long-term debt	$ 1,497	$ 1,496

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Statement of Financial Position [Abstract]
Allowance for credit losses	$ 176	$ 161
Allowance for credit losses and imputed discount current	656	623
Allowance for credit losses and imputed discount noncurrent	$ 158	$ 150
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)	1,271,074,364	1,262,904,154
Common stock, shares outstanding (in shares)	1,144,579,681	1,195,807,331
Treasury stock, at cost (in shares)	126,494,683	67,096,823

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Revenues
Revenues	$ 81,400	$ 78,558	$ 79,571
Operating expenses
Selling, general and administrative	20,818	21,311	21,607
Impairment expense	0	0	477
(Gain) loss on disposal group held for sale	0	(25)	1,087
Depreciation and amortization	12,919	12,818	13,651
Total operating expenses	63,390	64,292	73,028
Operating income	18,010	14,266	6,543
Other expense, net
Interest expense, net	(3,411)	(3,335)	(3,364)
Other income (expense), net	113	68	(33)
Total other expense, net	(3,298)	(3,267)	(3,397)
Income before income taxes	14,712	10,999	3,146
Income tax expense	(3,373)	(2,682)	(556)
Net income	11,339	8,317	2,590
Other comprehensive income, net of tax
Reclassification of loss from cash flow hedges, net of tax effect of $60, $56 and $52	176	163	151
Reclassification of loss from fair value hedges, net of unrealized loss on fair value hedges, net of tax effect of $5, $0 and $0	16	0	0
Unrealized gain (loss) on foreign currency translation adjustment, net of tax effect of $0, $0 and $(1)	0	9	(9)
Actuarial (loss) gain, net of amortization and reclassification, on pension and other postretirement benefits, net of tax effect of $(29), $(31) and $61	(85)	(90)	177
Other comprehensive income	107	82	319
Total comprehensive income	$ 11,446	$ 8,399	$ 2,909
Earnings per share
Basic (in USD per share)	$ 9.70	$ 7.02	$ 2.07
Diluted (in USD per share)	$ 9.66	$ 6.93	$ 2.06
Weighted-average shares outstanding
Basic (in shares)	1,169,195,373	1,185,121,562	1,249,763,934
Diluted (in shares)	1,173,213,898	1,200,286,264	1,255,376,769
Service
Revenues
Revenues	$ 66,178	$ 63,241	$ 61,323
Operating expenses
Cost of services, exclusive of depreciation and amortization shown separately below	10,771	11,655	14,666
Postpaid revenues
Revenues
Revenues	52,340	48,692	45,919
Prepaid revenues
Revenues
Revenues	10,399	9,767	9,857
Wholesale and other service revenues
Revenues
Revenues	3,439	4,782	5,547
Equipment revenues
Revenues
Revenues	14,263	14,138	17,130
Operating expenses
Cost of services, exclusive of depreciation and amortization shown separately below	18,882	18,533	21,540
Other revenues
Revenues
Revenues	$ 959	$ 1,179	$ 1,118

Consolidated Statements of Co_2

Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Income Statement [Abstract]
Cash flow hedges, tax effect	$ 60	$ 56	$ 52
Fair value hedges, tax effect	5	0	0
Amount recognized in Other income (expense), net reclassified from Accumulated other comprehensive loss	0	0	(1)
Pension and other postretirement benefit, tax	$ (29)	$ (31)	$ 61

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Operating activities
Net income	$ 11,339	$ 8,317	$ 2,590
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation and amortization	12,919	12,818	13,651
Stock-based compensation expense	649	667	595
Deferred income tax expense	3,120	2,600	492
Bad debt expense	1,192	898	1,026
Losses from sales of receivables	62	165	214
Impairment expense	0	0	477
Loss on remeasurement of disposal group held for sale	0	9	377
Changes in operating assets and liabilities
Accounts receivable	(3,088)	(5,038)	(5,158)
Equipment installment plan receivables	(523)	170	(1,184)
Inventory	131	197	744
Operating lease right-of-use assets	3,480	3,721	5,227
Other current and long-term assets	(411)	(358)	(754)
Accounts payable and accrued liabilities	(2,041)	(1,126)	558
Short- and long-term operating lease liabilities	(3,879)	(3,785)	(2,947)
Other current and long-term liabilities	(678)	(839)	459
Other, net	21	143	414
Net cash provided by operating activities	22,293	18,559	16,781
Investing activities
Purchases of property and equipment, including capitalized interest of $(34), $(104) and $(61)	(8,840)	(9,801)	(13,970)
Purchases of spectrum licenses and other intangible assets, including deposits	(3,471)	(1,010)	(3,331)
Proceeds from sales of tower sites	0	12	9
Proceeds related to beneficial interests in securitization transactions	3,579	4,816	4,836
Acquisition of companies, net of cash acquired	(373)	0	(52)
Other, net	33	154	149
Net cash used in investing activities	(9,072)	(5,829)	(12,359)
Financing activities
Proceeds from issuance of long-term debt	8,587	8,446	3,714
Repayments of financing lease obligations	(1,367)	(1,227)	(1,239)
Repayments of long-term debt	(5,073)	(5,051)	(5,556)
Repurchases of common stock	(11,228)	(13,074)	(3,000)
Dividends on common stock	(3,300)	(747)	0
Tax withholdings on share-based awards	(269)	(297)	(243)
Other, net	(165)	(147)	(127)
Net cash used in financing activities	(12,815)	(12,097)	(6,451)
Change in cash and cash equivalents, including restricted cash and cash held for sale	406	633	(2,029)
Cash and cash equivalents, including restricted cash and cash held for sale
Beginning of period	5,307	4,674	6,703
End of period	$ 5,713	$ 5,307	$ 4,674

Consolidated Statements of Ca_2

Consolidated Statements of Cash Flows (Parenthetical) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Statement of Cash Flows [Abstract]
Capitalized interest	$ (34)	$ (104)	$ (61)

Consolidated Statement of Stock

Consolidated Statement of Stockholders’ Equity - USD ($) $ in Millions		Total	Common Stock Outstanding	Treasury Shares Outstanding	Par Value and Additional Paid-in Capital	Accumulated Other Comprehensive Loss	Retained Earnings
Beginning balance (in shares) at Dec. 31, 2021			1,249,213,681
Beginning balance of treasury stock, (in shares) at Dec. 31, 2021				1,537,468
Beginning balance at Dec. 31, 2021		$ 69,102		$ (13)	$ 73,292	$ (1,365)	$ (2,812)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		2,590					2,590
Other comprehensive income		319				319
Stock-based compensation		656			656
Stock issued for employee stock purchase plan (in shares)			2,079,086
Stock issued for employee stock purchase plan		227			227
Issuance of vested restricted stock units (in shares)			5,796,891
Shares withheld related to net share settlement of stock awards and stock options (in shares)			(1,900,710)
Shares withheld related to net share settlement of stock awards and stock options		(243)			(243)
Repurchases of common stock (in shares)			(21,361,409)	(21,361,409)
Repurchases of common stock		(3,000)		$ (3,000)
Other, net (in shares)			132,539	17,572
Other, net		5		$ (3)	9		(1)
Ending balance (in shares) at Dec. 31, 2022			1,233,960,078
Ending balance of treasury stock, (in shares) at Dec. 31, 2022				22,916,449
Ending balance at Dec. 31, 2022		69,656		$ (3,016)	73,941	(1,046)	(223)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		8,317					8,317
Dividends declared		(747)					(747)
Other comprehensive income		82				82
Stock-based compensation		687			687
Stock issued for employee stock purchase plan (in shares)			1,771,475
Stock issued for employee stock purchase plan		210			210
Issuance of vested restricted stock units (in shares)			6,074,565
Shares withheld related to net share settlement of stock awards and stock options (in shares)			(2,027,800)
Shares withheld related to net share settlement of stock awards and stock options		(297)			(297)
Repurchases of common stock (in shares)			(92,925,044)	(92,925,044)
Repurchases of common stock		(13,255)		$ (13,255)
SoftBank contingent shares settlement (in shares)	[1]		48,751,557	(48,751,557)
SoftBank contingent shares settlement	[1]	52		$ 6,901	(6,849)
Other, net (in shares)			202,500	6,887
Other, net		$ 10		$ (3)	13
Ending balance (in shares) at Dec. 31, 2023		1,195,807,331	1,195,807,331
Ending balance of treasury stock, (in shares) at Dec. 31, 2023		67,096,823		67,096,823
Ending balance at Dec. 31, 2023		$ 64,715		$ (9,373)	67,705	(964)	7,347
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		11,339					11,339
Dividends declared		(4,302)					(4,302)
Other comprehensive income		107				107
Stock-based compensation		619			619
Stock issued for employee stock purchase plan (in shares)			1,519,242
Stock issued for employee stock purchase plan		191			191
Issuance of vested restricted stock units (in shares)			4,740,186
Shares withheld related to net share settlement of stock awards and stock options (in shares)			(1,552,111)
Shares withheld related to net share settlement of stock awards and stock options		(269)			(269)
Repurchases of common stock (in shares)			(59,376,922)	(59,376,922)
Repurchases of common stock		(11,206)		$ (11,206)
Ka'ena Acquisition upfront consideration (in shares)			3,264,952
Ka’ena Acquisition upfront consideration		536			536
Other, net (in shares)			177,003	20,938
Other, net		$ 11		$ (5)	16
Ending balance (in shares) at Dec. 31, 2024		1,144,579,681	1,144,579,681
Ending balance of treasury stock, (in shares) at Dec. 31, 2024		126,494,683		126,494,683
Ending balance at Dec. 31, 2024		$ 61,741		$ (20,584)	$ 68,798	$ (857)	$ 14,384
[1]Represents the issuance of the SoftBank Specified Shares pursuant to the Letter Agreement. See Note 1 6 – Earnings Per Share of the Notes to the Consolidated Financial Statements for more information.

Consolidated Statement of Sto_2

Consolidated Statement of Stockholders’ Equity (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Statement of Stockholders' Equity [Abstract]
Common stock, dividends declared (in USD per share)	$ 3.71	$ 0.65

Summary of Significant Accounti

Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2024
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Summary of Significant Accounting Policies	Note 1 – Summary of Significant Accounting Policies Description of Business T-Mobile US, Inc. (“T-Mobile,” “we,” “our,” “us” or the “Company”), together with its consolidated subsidiaries, is a leading provider of wireless communications services, including voice, messaging and data, under its flagship brands, T-Mobile, Metro™ by T-Mobile (“Metro by T-Mobile”) and Mint Mobile, in the United States, Puerto Rico and the U.S. Virgin Islands. Substantially all of our revenues were earned in, and substantially all of our long-lived assets are located in, the U.S., Puerto Rico and the U.S. Virgin Islands. We provide wireless communications services primarily using our 5G technology network and our 4G Long Term Evolution (“LTE”) network. We also offer a wide selection of wireless devices, including handsets, tablets and other mobile communication devices, and accessories for sale, as well as financing through equipment installment plans (“EIP”). We provide reinsurance for device insurance policies and extended warranty contracts offered to our wireless communications customers. In addition to our wireless communications services, we offer High Speed Internet utilizing our nationwide 5G network. Basis of Presentation The accompanying 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, as well as 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 10 – Tower Obligations . Intercompany transactions and balances have been eliminated in consolidation. We operate as a single operating segment. The preparation of financial statements in conformity with U.S. generally accepted accounting principles (“GAAP”) requires our management to make estimates and assumptions which affect our consolidated financial statements and accompanying notes. Estimates are based on historical experience, where applicable, and other assumptions which our management believes are reasonable under the circumstances. These estimates are inherently subject to judgment and actual results could differ from those estimates. Cash and Cash Equivalents Cash equivalents consist of highly liquid money market funds and U.S. Treasury securities with remaining maturities of three months or less at the date of purchase. Receivables and Related Allowance for Credit Losses Accounts Receivable Accounts receivable balances are predominantly comprised of amounts currently due from customers (e.g., for wireless communications services), device insurance administrators, wholesale partners, other carriers and third-party retail channels. Accounts receivable are presented on our Consolidated Balance Sheets at their amortized cost basis (i.e., the receivables’ unpaid principal balance (“UPB”) as adjusted for any written-off amounts relating to impairment), net of the allowance for credit losses. We have an arrangement to sell certain of our customer service accounts receivable on a revolving basis, which are treated as sales of financial assets. See Note 5 – Sales of Certain Receivables for further information. Equipment Installment Plan Receivables We offer certain customers the option to pay for their devices and other purchases in installments, generally over a period of 24 months, using an EIP. EIP receivables are presented on our Consolidated Balance Sheets at their amortized cost basis (i.e., the receivables’ UPB as adjusted for any written-off amounts due to impairment and unamortized discounts), net of the allowance for credit losses. At the time of an installment sale, we impute a discount for interest if the term exceeds 12 months as there is no stated rate of interest on the receivables. The receivables are recorded at their present value, which is determined by discounting expected future cash payments at the imputed interest rate. This adjustment results in a discount or reduction in the transaction price of the contract with a customer, which is allocated to the performance obligations of the arrangement such as Service and Equipment revenues on our Consolidated Statements of Comprehensive Income. The imputed discount rate reflects a current market interest rate and includes a component for estimated credit risk underlying the EIP receivable, reflecting the estimated credit worthiness of the customer. The imputed discount on receivables is amortized over the financed installment term using the effective interest method and recognized as Other revenues on our Consolidated Statements of Comprehensive Income. The current portion of the EIP receivables is included in Equipment installment plan receivables, net and the long-term portion of the EIP receivables is included in Equipment installment plan receivables due after one year, net on our Consolidated Balance Sheets. We have an arrangement to sell certain EIP receivables on a revolving basis, which are treated as sales of financial assets. See Note 5 – Sales of Certain Receivables for further information. Additionally, certain of our EIP receivables included on our Consolidated Balance Sheets secure our asset-backed notes (“ABS Notes”). See Note 9 – Debt for further information. 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 (i.e., accounts receivable and EIP receivable portfolio segments) as of period end. Each portfolio segment is comprised of pools of receivables that are evaluated collectively based on similar risk characteristics. Our allowance levels consider estimated credit risk over the contractual life of the receivables and are influenced by receivable volumes, receivable delinquency status, historical loss experience and other conditions that affect loss expectations, such as changes in credit and collections policies and forecasts of macroeconomic conditions. While we attribute portions of the allowance to our respective portfolio segments, the entire allowance is available to credit losses related to the total receivable portfolio. We consider a receivable past due and delinquent 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. If there is a deterioration of our customers’ financial condition or if future actual default rates on receivables in general differ from those currently anticipated, we will adjust our allowance for credit losses accordingly. Inventories Inventories consist primarily of wireless devices and accessories, which are valued at the lower of cost or net realizable value. Cost is determined using standard cost, which approximates average cost. Shipping and handling costs paid to wireless device and accessories vendors as well as costs to refurbish used devices are included in the standard cost of inventory. Net realizable value is the estimated selling price in the ordinary course of business, less reasonably predictable costs of disposal and transportation. We record inventory write-downs to net realizable value for obsolete and slow-moving items based on inventory turnover trends and historical experience. Recourse Guarantee Liabilities and Deferred Purchase Price Assets In connection with the sales of certain service and EIP accounts receivable pursuant to the sale arrangements, we have recourse guarantee liabilities, beginning on November 1, 2024, and deferred purchase price assets, prior to November 1, 2024, measured at fair value that are based on a discounted cash flow model using unobservable Level 3 inputs, including estimated customer default rates and credit worthiness. See Note 5 – Sales of Certain Receivables for further information. Long-Lived Assets Long-lived assets include assets that do not have indefinite lives, such as property and equipment and certain intangible assets. Property and Equipment Property and equipment consists of buildings and equipment, including certain network server equipment, wireless communications systems, leasehold improvements, capitalized software, leased wireless devices and construction in progress. Wireless communications systems include assets to operate our wireless network and information technology data centers, including tower assets, leasehold improvements and asset retirement costs. Leasehold improvements include asset improvements other than those related to the wireless network. Property and equipment are recorded at cost less accumulated depreciation and impairments, if any, in Property and equipment, net on our Consolidated Balance Sheets. We generally depreciate property and equipment over the period the property and equipment provide economic benefit using the straight-line method. Depreciable life studies are performed periodically to confirm the appropriateness of depreciable lives for certain categories of property and equipment. These studies take into account actual usage, physical wear and tear, replacement history and assumptions about technology evolution. When these factors indicate the useful life of an asset is different from the previous assessment, the remaining book value is depreciated prospectively over the adjusted remaining estimated useful life. Leasehold improvements are depreciated over the shorter of their estimated useful lives or the related lease term. Costs of major replacements and improvements are capitalized. Repair and maintenance expenditures which do not enhance or extend the asset’s useful life are charged to operating expenses as incurred. Construction costs, labor and overhead incurred in the expansion or enhancement of our wireless network are capitalized. Capitalization commences with pre-construction period administrative and technical activities, which include obtaining zoning approvals and building permits, and ceases at the point at which the asset is ready for its intended use. We capitalize interest associated with the acquisition or construction of certain property and equipment. Capitalized interest is reported as a reduction in interest expense and depreciated over the useful life of the related asset. We record an asset retirement obligation for the estimated fair value of legal obligations associated with the retirement of tangible long-lived assets and a corresponding increase in the carrying amount of the related asset in the period in which the obligation is incurred. In periods subsequent to initial measurement, we recognize changes in the liability resulting from the passage of time and revisions to either the timing or the amount of the original estimate. Over time, the liability is accreted to its present value and the capitalized cost is depreciated over the estimated useful life of the asset. Our obligations relate primarily to certain legal obligations to remediate leased property on which our network infrastructure and administrative assets are located. We capitalize certain costs incurred in connection with developing or acquiring internal use software. Capitalization of software costs commences once the final selection of the specific software solution has been made and management authorizes and commits to funding the software project and ceases once the project is ready for its intended use. Capitalized software costs are included in Property and equipment, net on our Consolidated Balance Sheets and are amortized on a straight-line basis over the estimated useful life of the asset. Costs incurred during the preliminary project stage, as well as maintenance and training costs, are expensed as incurred. Other Intangible Assets Intangible assets that do not have indefinite useful lives are amortized over their estimated useful lives. Customer relationships are amortized using the sum-of-the-years digits method. The remaining finite-lived intangible assets are amortized using the straight-line method. See Note 7 - Goodwill, Spectrum License Transactions and Other Intangible Assets for further information. Impairment We assess potential impairments to our long-lived assets when events or changes in circumstances indicate the carrying amount of the asset may not be recoverable. If any indicators of impairment are present, we test recoverability. The carrying value of a long-lived asset or asset group is not recoverable if the carrying value exceeds the sum of the estimated undiscounted future cash flows expected to be generated from the use and eventual disposition of the asset or asset group. If the estimated undiscounted future cash flows do not exceed the asset or asset group’s carrying amount, then an impairment loss is recorded, measured as the amount by which the carrying amount of a long-lived asset or asset group exceeds its estimated fair value. Business Combinations Assets acquired and liabilities assumed as part of a business combination are generally recorded at their fair value at the date of acquisition. The excess of purchase price over the fair value of assets acquired and liabilities assumed is recorded as goodwill. Determining fair value of identifiable assets, particularly intangibles, and liabilities acquired requires management to make estimates, which are based on all available information and in some cases assumptions with respect to the timing and amount of future revenues and expenses associated with an asset or liability. See Note 2 – Business Combinations for further discussion of our acquisitions. Goodwill and Indefinite-Lived Intangible Assets Goodwill Goodwill consists of the excess of the purchase price over the fair value of identifiable net assets acquired in a business combination and is assigned to our one reporting unit: wireless. Spectrum Licenses Spectrum licenses are carried at costs incurred to acquire the spectrum licenses and the costs to prepare the spectrum licenses for their intended use, such as costs to clear acquired spectrum licenses. The FCC issues spectrum licenses which provide us with the exclusive right to utilize designated radio frequency spectrum within specific geographic service areas to provide wireless communications services. Spectrum licenses are issued for a fixed period of time, typically up to 15 years; however, the FCC has granted license renewals routinely and at a nominal cost. The spectrum licenses acquired expire at various dates and we believe we will be able to meet all requirements necessary to secure renewal of our spectrum licenses at a nominal cost. Moreover, we determined that there are currently no legal, regulatory, contractual, competitive, economic or other factors that limit the useful lives of our spectrum licenses. The utility of radio frequency spectrum does not diminish while activated on our network nor does it otherwise deteriorate over time. Therefore, we determined the spectrum licenses should be treated as indefinite-lived intangible assets. At times, we enter into agreements to sell or exchange spectrum licenses. Upon entering into a sale or exchange arrangement, if the transaction has been deemed to have commercial substance and the spectrum licenses meet the held for sale criteria, the licenses are classified as held for sale at their carrying value, as adjusted for any impairment recognized, included in Other current assets or Other assets on our Consolidated Balance Sheets until approval and completion of the sale or an exchange. Upon closing of the transaction, spectrum licenses acquired as part of an exchange of nonmonetary assets are recorded at fair value and the difference between the fair value of the spectrum licenses obtained, carrying value of the spectrum licenses transferred and cash paid, if any, is recognized as a gain or loss on disposal of spectrum licenses included in Selling, general and administrative expenses on our Consolidated Statements of Comprehensive Income. Our fair value estimates of spectrum licenses are based on information for which there is little or no observable market data. If the transaction lacks commercial substance or the fair value is not measurable, the acquired spectrum licenses are recorded at our carrying value of the spectrum assets transferred or exchanged. We have lease agreements (the “Agreements”) with various educational and non-profit institutions that provide us with the right to use Federal Communications Commission (“FCC”) spectrum licenses (known as “Educational Broadband Services” or “EBS” spectrum) in the 2.5 GHz band. The Agreements are typically for terms of five Leased FCC spectrum licenses are recorded as executory contracts, and contractual lease payments are recognized on a straight-line basis over the remaining term of the arrangement, including renewals, and are presented in Cost of services on our Consolidated Statements of Comprehensive Income. The spectrum licenses we hold plus the spectrum leases enhance the overall value of our spectrum licenses as the collective value is higher than the value of individual bands of spectrum within a specific geography. This value is derived from the ability to provide wireless service to customers across large geographic areas and maintain the same or similar wireless connectivity quality. This enhanced value from combining owned and leased spectrum licenses is referred to as an aggregation premium. The aggregation premium is a component of the overall fair value of our owned FCC spectrum licenses. Impairment We assess the carrying value of our goodwill and other indefinite-lived intangible assets, such as our spectrum license portfolio, for potential impairment annually as of December 31 or more frequently, if events or changes in circumstances indicate such assets might be impaired. We test goodwill on a reporting unit basis by comparing the estimated fair value of the reporting unit to its book value. If the fair value exceeds the book value, then no impairment is measured. As of December 31, 2024, we have identified one reporting unit: wireless. The wireless reporting unit consists of all the assets and liabilities of T-Mobile US, Inc. When assessing goodwill for impairment we may elect to first perform a qualitative assessment to determine if the quantitative impairment test is necessary. If we do not perform a qualitative assessment, or if the qualitative assessment indicates it is more likely than not that the fair value of a reporting unit is less than its carrying amount, we perform a quantitative test. We recognize an impairment charge for the amount by which the carrying amount exceeds the reporting unit’s fair value; however, the loss recognized would not exceed the total amount of goodwill allocated to that reporting unit. We employ a qualitative approach to assess the wireless reporting unit. The fair value of the wireless reporting unit is determined using a market approach, which is based on market capitalization. We recognize that market capitalization is subject to volatility and will monitor changes in market capitalization to determine whether declines, if any, necessitate an interim impairment review. In the event market capitalization does decline below its book value, we will consider the length, severity and reasons for the decline when assessing whether potential impairment exists, including considering whether a control premium should be added to the market capitalization. We believe short-term fluctuations in share price may not necessarily reflect the underlying aggregate fair value. No events or change in circumstances have occurred that indicate the fair value of the wireless reporting unit may be below its carrying amount at December 31, 2024. We test our spectrum licenses for impairment on an aggregate basis, consistent with our management of the overall business at a national level. We may elect to first perform a qualitative assessment to determine whether it is more likely than not that the fair value of an intangible asset is less than its carrying value. If we do not perform the qualitative assessment, or if the qualitative assessment indicates it is more likely than not that the fair value of the intangible asset is less than its carrying amount, we calculate the estimated fair value of the intangible asset. If the estimated fair value of the spectrum licenses is lower than their carrying amount, an impairment loss is recognized for the difference. We employ the qualitative method. We estimate fair value of spectrum licenses using the Greenfield methodology. The Greenfield methodology values the spectrum licenses by calculating the cash flow generating potential of a hypothetical start-up company that goes into business with no assets except for the asset to be valued (in this case, spectrum licenses) and makes investments required to build an operation comparable to current use. The value of the spectrum licenses is the present value of the cash flows of this hypothetical start-up company. We base the assumptions underlying the Greenfield methodology on a combination of market participant data and our historical results, trends and business plans. Future cash flows in the Greenfield methodology are based on estimates and assumptions of market participant revenues, EBITDA margin, network build-out period and a long-term growth rate for a market participant. The cash flows are discounted using a weighted-average cost of capital. No events or change in circumstances have occurred that indicate the fair value of the Spectrum licenses may be below their carrying amount at December 31, 2024. The valuation approaches utilized to estimate fair value for the purposes of the impairment tests of goodwill and spectrum licenses may require that management make difficult, subjective and complex judgements about matters that are inherently uncertain. If actual results or future expectations are not consistent with the assumptions used in our estimate of fair value, it may result in the recording of significant impairment charges on goodwill or spectrum licenses. The most significant assumptions within the valuation models are the discount rate based on the weighted-average cost of capital, revenues, EBITDA margins, capital expenditures and long-term growth rate. For more information regarding our impairment assessments of indefinite-lived intangible assets, see Note 7 – Goodwill, Spectrum License Transactions and Other Intangible Assets . Fair Value Measurements We carry certain assets and liabilities at fair value. Fair value is defined as an exit price, representing the amount that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. The three-tier hierarchy for inputs used in measuring fair value, which prioritizes the inputs based on the observability as of the measurement date, is as follows: Level 1 Quoted prices in active markets for identical assets or liabilities; Level 2 Observable inputs other than the quoted prices in active markets for identical assets and liabilities; and Level 3 Unobservable inputs for which there is little or no market data, which require us to develop assumptions of what market participants would use in pricing the asset or liability. Assets and liabilities are classified in their entirety based on the lowest level of input that is significant to the fair value measurement. Our assessment of the significance of a particular input to the fair value measurement requires judgment and may affect the placement of assets and liabilities being measured within the fair value hierarchy. 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 imputed interest rate. With the exception of certain long-term fixed-rate debt, there were no financial instruments with a carrying value materially different from their fair value. See Note 8 – Fair Value Measurements for a comparison of the carrying values and fair values of our short-term and long-term debt. Foreign Currency Transactions On May 8, 2024, we issued €2.0 billion of euro (“EUR”) denominated debt. T-Mobile’s functional currency is the U.S. dollar (“USD”). Each period, we convert activity and balances in EUR into USD using average exchange rates for the period for income statement amounts and using end-of-period or spot exchange rates for assets and liabilities. We record transaction gains and losses resulting from the conversion of transaction currency to functional currency as a component of Other income (expense), net on our Consolidated Statements of Comprehensive Income. Derivative and Hedging Instruments The Company manages its exposure to foreign exchange rates and interest rates through a risk management program that includes the use of derivative financial instruments, including cross-currency swaps. We designate certain derivatives as accounting hedge relationships. We do not hold derivatives for trading or speculative purposes. We record derivatives on our Consolidated Balance Sheets and recognize them as either assets or liabilities at fair value. Fair value is derived primarily from observable market data, and our derivatives are classified as Level 2 in the fair value hierarchy. Cash flows associated with qualifying hedge derivative instruments are presented in the same category on our 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. Revenue Recognition We primarily generate our revenue from providing wireless communications services and selling devices and accessories to customers. Our contracts with customers may involve more than one performance obligation, which include wireless services, wireless devices or a combination thereof, and we allocate the transaction price between each performance obligation based on its relative standalone selling price. Wireless Communications Services Revenue We generate our wireless communications services revenues from providing access to, and usage of, our wireless communications network. Service revenues also include revenues earned for providing premium services to customers, such as device insurance services. Generally, service contracts are billed monthly in advance of services being transferred or are prepaid. Service revenue is recognized as we satisfy our performance obligation to transfer service to our customers. We typically satisfy our stand-ready performance obligations, including unlimited wireless services, evenly over the contract term as services are transferred to our customers. The enforceable duration of our postpaid service contracts with customers is typically one month. However, promotional EIP bill credits offered to a customer on an equipment sale that are paid over time and are contingent on the customer maintaining a service contract may result in an extended service contract based on whether a substantive penalty is deemed to exist. Revenue is recorded net of costs paid to a third party for performance obligations where we facilitate an arrangement for the other party to transfer goods or services to our customer (i.e., when we are acting as an agent). For example, performance obligations relating to services provided by third-party content providers where we neither control a right to the content provider’s service nor control the underlying service itself are presented net. Consideration payable to a customer is treated as a reduction of the total transaction price, unless the payment is in exchange for a distinct good or service, such as certain commissions paid to dealers, in which case the payment is treated as a purchase of that distinct good or service. Federal Universal Service Fund (“USF”) and state USF fees are assessed to T-Mobile by various governmental authorities in connection with the services we provide to our customers and are included in Cost of services. When we separately bill and collect these regulatory fees from customers, they are recorded gross in Total service revenues on our Consolidated Statements of Comprehensive Income. For the years ended December 31, 2024, 2023 and 2022, we recorded approximately $386 million, $317 million and $185 million, respectively, of USF fees on a gross basis. We have made an accounting policy election to exclude from the measurement of the transaction price all taxes assessed to the customer by a governmental authority that are both imposed on and concurrent with a specific revenue-producing transaction and collected by us from a customer on behalf of the taxing agency (e.g., sales, use, value added, and some excise taxes). Equipment Revenues We generate equipment revenues from the sale of mobile communication devices and accessories. Equipment revenues related to device and accessory sales are typically recognized at a point in time when control of the device or accessory is transferred to the customer or dealer. We have elected to account for shipping and handling activities that occur after control of the related good transfers as fulfillment activities, as opposed to performance obligations. We estimate variable consideration (e.g., device returns or certain payments to indirect dealers) primarily based on historical experience. Equipment sales for which we determine it is not probable that we will collect substantially all of the transaction price are generally recorded as payments are received. Our assessment of collectibility considers contract terms such as down payments that reduce our exposure to credit risk. We offer certain customers the option to pay for devices and accessories in installments using an EIP. This financing option is provided at a stated interest of zero and is typically over a 24-month period. We recognize as a reduction of the total transaction price the effects of a financing component in contracts via the imputation of interest when customers purchase their devices and accessories on an EIP, including those financing components that are not considered to be significant to the contract. However, we have elected the practical expedient of not recognizing the effects of a significant financing component for contracts where we expect, at contract inception, that the period between the transfer of a performance obligation to a customer and the customer’s payment for that performance obligation will be one year or less. Imputed Interest on EIP Receivables For EIP with a duration greater than one year, we record the effects of financing via the imputation of interest. This is performed on all such EIP receivables regardless as to whether or not the financing is considered to be significant. The imputation of interest results in a discount of the EIP receivable, thereby adjusting the transaction price of the contract with the customer, which is then allocated to the performance obligations of the arrangement. Judgment is required to determine the imputed interest rate. For EIP sales, the imputed rate used to adjust the transaction price reflects current market interest rates, including the estimated credit risk of the underlying customers. Customer credit behavior is inherently uncertain. See “Receivables and Related Allowance for Credit Losses” above, for additional discussion on how we assess credit risk. Contract Balances Generally, our devices and service plans are available at standard prices, which are maintained on price lists and published on our website and/or within our retail stores. For contracts that involve more than one product or service that are identified as separate performance

Business Combinations

Business Combinations	12 Months Ended
	Dec. 31, 2024
Business Combination, Asset Acquisition, 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 “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. Ka’ena is a provider of prepaid mobile services in the U.S. through its primary brands, Mint Mobile and Ultra Mobile, and also offers a selection of wireless devices, including handsets and other mobile communication devices. Prior to the Ka’ena Acquisition, Ka’ena was a wholesale partner of the Company for which we recognized service revenues within Wholesale and other service revenues on our Consolidated Statements of Comprehensive Income, and for which Ka’ena incurred related expenses for the use of our network. On the Acquisition Date, this relationship was effectively terminated, and the Company acquired Ka’ena’s prepaid customer relationships and began to recognize service revenues associated with these customers within Prepaid revenues and operating expenses primarily within Selling, general and administrative expenses on our Consolidated Statements of Comprehensive Income subsequent to the Acquisition Date. The Ka’ena Acquisition enhances the Company’s position as a leading prepaid wireless carrier by diversifying our brand identities, enhancing our distribution footprint and preserving the value of our relationship with Ka’ena through its acquisition, including the acquisition of its prepaid customer relationships. The financial results of Ka’ena from the Acquisition Date through December 31, 2024, were not material to our Consolidated Statements of Comprehensive Income, nor were they material to our prior period consolidated results on a pro forma basis. Costs related to the Ka’ena Acquisition were not material to our Consolidated Statements of Comprehensive Income. Consideration Transferred In accordance with the terms of the Merger and Unit Purchase Agreement, the total purchase price is variable, dependent upon specified performance indicators of Ka’ena, and consists of an upfront payment on the Acquisition Date and an earnout payable on August 1, 2026. On the Acquisition Date and in satisfaction of the upfront payment, we transferred $420 million in cash and 3,264,952 shares of T-Mobile common stock valued at $536 million as determined based on its closing market price on April 30, 2024, for a total payment fair value of $956 million. An additional amount of the upfront payment payable to certain sellers was deferred and may be paid through January 2026. As of the Acquisition Date, we recognized a liability of $27 million for the fair value of this deferred amount, which is included in the fair value of consideration transferred in the Ka’ena Acquisition. Furthermore, a portion of the upfront payment made on the Acquisition Date was for the settlement of the preexisting wholesale relationship with Ka’ena and excluded from the fair value of consideration transferred in the Ka’ena Acquisition. The amount of the upfront payment was subject to customary adjustments and as a result of such adjustments, $17 million of the upfront payment was returned to T-Mobile during the fourth quarter of 2024, which resulted in a commensurate increase in the maximum amount payable in satisfaction of the earnout. Based on the amount of the adjusted upfront payment, up to an additional $420 million in future cash and T-Mobile common stock is payable in satisfaction of the earnout, dependent upon Ka’ena’s achievement of specified performance indicators. • $251 million of the potential earnout amount is payment for the acquired Ka’ena business, and we recognized a liability of $191 million for the fair value of such contingent consideration. This liability is adjusted to fair value at each future reporting date until settled, with a corresponding offset recorded to Selling, general and administrative expenses on our Consolidated Statements of Comprehensive Income. • $169 million of the potential earnout amount is payment for services to be provided to T-Mobile by certain of the sellers during the post-acquisition period, as well as the replacement of equity awards of certain Ka’ena employees. We recognize expenses as such services are provided during the post-acquisition period within Selling, general and administrative expenses on our Consolidated Statements of Comprehensive Income, with a corresponding offset to Other current liabilities and Other long-term liabilities on our Consolidated Balance Sheets. The acquisition-date fair value of consideration transferred in the Ka’ena Acquisition totaled $1.1 billion, comprised of the following: (in millions) May 1, 2024 Fair value of T-Mobile common stock issued to Ka’ena stockholders related to the adjusted upfront payment $ 527 Fair value of cash paid to Ka’ena stockholders related to the adjusted upfront payment 396 Fair value of contingent consideration 191 Fair value of deferred consideration 27 Total fair value of consideration exchanged $ 1,141 The fair value of contingent consideration related to the earnout was estimated using the income approach, a probability-weighted discounted cash flow model, whereby a Monte Carlo simulation method estimated the probability of different outcomes. This fair value measurement is based on significant inputs not observable in the market and, therefore, represents a Level 3 measurement as defined in ASC 820. The key assumptions in applying the income approach for the contingent consideration include forecasted Ka’ena financial information, primarily revenue, marketing costs and customer metrics, the probability of achieving the forecasted financial information and the discount rate. As of December 31, 2024, $202 million of liabilities for contingent consideration and $80 million of liabilities for post-acquisition services were presented within Other long-term liabilities on our Consolidated Balance Sheets. Fair Value of Assets Acquired and Liabilities Assumed We have accounted for the Ka’ena Acquisition as a business combination. The identifiable assets acquired and liabilities assumed from Ka’ena were recorded at their provisionally assigned fair values as of the Acquisition Date and consolidated with those of T-Mobile. Assigning fair values to the assets acquired and liabilities assumed at the Acquisition Date requires the use of judgment regarding estimates and assumptions. For the provisionally assigned fair values of the assets acquired and liabilities assumed, we used the cost and income approaches. The following table summarizes the provisionally assigned fair values for each class of assets acquired and liabilities assumed at the Acquisition Date. We retained the services of certified valuation specialists to assist with assigning values to certain acquired assets. We are in the process of finalizing the valuation of the assets acquired and liabilities assumed, including income tax-related amounts. Therefore, the provisionally assigned fair values set forth below are subject to adjustment as additional information is obtained and the valuations are completed. (in millions) May 1, 2024 Cash and cash equivalents $ 24 Accounts receivable 34 Inventory 3 Prepaid expenses 5 Other current assets 10 Property and equipment 1 Operating lease right-of-use assets 2 Goodwill 771 Other intangible assets 740 Other assets 51 Total assets acquired 1,641 Accounts payable and accrued liabilities 42 Deferred revenue 297 Short-term operating lease liabilities 1 Deferred tax liabilities 86 Operating lease liabilities 2 Other long-term liabilities 72 Total liabilities assumed 500 Total consideration transferred $ 1,141 Intangible Assets Goodwill with a provisionally assigned value of $771 million represents the excess of the consideration transferred over the fair values of assets acquired and liabilities assumed. The provisionally assigned goodwill recognized includes expected growth in customers and service revenues to be achieved from the operations of the combined company, the assembled workforce of Ka’ena and intangible assets that do not qualify for separate recognition. Of the total provisionally assigned amount of goodwill resulting from the Ka’ena Acquisition of $771 million, the preliminary amount deductible for tax purposes is $90 million. All of the goodwill acquired is allocated to the Wireless reporting unit. Other intangible assets acquired primarily include $545 million of customer relationships with an estimated weighted-average useful life of six years, $70 million of tradenames with an estimated weighted-average useful life of eight years and $125 million of other intangible assets with an estimated weighted-average useful life of four years. The customer relationships are being amortized using the sum-of-the-years digits method over their estimated useful lives, and the tradenames are being amortized on a straight-line basis over their estimated useful lives. The preliminary fair value of customer relationships was estimated using the income approach. This fair value measurement is based on significant inputs not observable in the market, and, therefore, represents a Level 3 measurement as defined in ASC 820. The key assumptions in applying the income approach include forecasted subscriber churn rates, revenue over an estimated period of time, the discount rate and estimated income taxes. Acquisition of UScellular Wireless Operations 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, pursuant to which, among other things, we will acquire 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 an exchange offer to be made to certain UScellular debtholders prior to closing. To the extent any debtholders do not participate in the exchange, their bonds will continue as obligations of UScellular, and the cash portion of the purchase price will be correspondingly increased. The transaction is expected to close in mid-2025, subject to customary closing conditions and receipt of certain regulatory approvals. Upon closing of the transaction, we expect to account for the UScellular transaction as a business combination and to consolidate the acquired operations. Following the closing of the transaction, UScellular will retain ownership of its other spectrum, as well as its towers. Subject to the closing of the transaction, we will enter into a 15-year master license agreement to lease space on at least 2,100 towers being retained and to extend our tenancy term on approximately 600 towers where we are already leasing space from UScellular for 15 years post-closing. We estimate the incremental future minimum lease payments associated with the master license agreement will be $1.4 billion over 15 years post-closing. 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., a provider of technology solutions for digital-out-of-home advertisements, for a purchase price of approximately $625 million. The purchase price is subject to certain agreed-upon working capital and other adjustments. The acquisition is subject to certain customary closing conditions, including certain regulatory approvals, and is expected to close in the first quarter of 2025.

Joint Ventures

Joint Ventures	12 Months Ended
	Dec. 31, 2024
Business Combination, Asset Acquisition, and Joint Venture Formation [Abstract]
Joint Ventures	Note 3 – Joint Ventures Lumos and Metronet Joint Ventures On April 24, 2024, we entered into a definitive agreement with a fund operated by EQT, Infrastructure VI fund (“Fund VI”), to establish a joint venture between us and Fund VI to acquire Lumos (“Lumos”), a fiber-to-the-home platform, from EQT’s predecessor fund, EQT Infrastructure III. The arrangement is expected to close in the first half of 2025, subject to customary closing conditions and regulatory approvals. At closing, we expect to invest approximately $950 million in the joint venture to acquire a 50% equity interest and all existing Lumos fiber customers. The funds invested by us will be used by the joint venture to fund future fiber builds. In addition, pursuant to the definitive agreement, we expect to make an additional capital contribution of approximately $500 million in 2027 or 2028 under the existing business plan. On July 18, 2024, we entered into a definitive agreement with KKR & Co. Inc. (“KKR”) to establish a joint venture to acquire Metronet Holdings, LLC and certain of its affiliates (collectively, “Metronet”), a fiber-to-the-home platform. This arrangement is expected to close in 2025, subject to customary closing conditions and regulatory approvals. At closing, we expect to invest approximately $4.9 billion in the joint venture to acquire a 50% equity interest and all existing residential fiber customers, as well as funding the joint venture. We do not anticipate making further capital contributions following the closing under the existing business plan. Upon closing of the transactions, we expect to account for the Lumos and Metronet joint ventures under the equity method of accounting and recognize service revenues for the acquired Lumos and Metronet fiber customers and wholesale costs paid to the joint ventures for network access within Cost of services on our Consolidated Statements of Comprehensive Income.

Receivables and Related Allowan

Receivables and Related Allowance for Credit Losses	12 Months Ended
	Dec. 31, 2024
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 is comprised of two portfolio segments: accounts receivable and equipment installment plan receivables. Accounts Receivable Portfolio Segment Accounts receivable balances are predominately comprised 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 Based upon customer credit profiles at the time of customer origination, as well as subsequent credit performance, we classify 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 11.1% and 10.6% as of December 31, 2024 and 2023, respectively. The following table summarizes the EIP receivables, including imputed discounts and related allowance for credit losses: (in millions) December 31, December 31, EIP receivables, gross $ 7,402 $ 7,271 Unamortized imputed discount (524) (505) EIP receivables, net of unamortized imputed discount 6,878 6,766 Allowance for credit losses (290) (268) EIP receivables, net of allowance for credit losses and imputed discount $ 6,588 $ 6,498 Classified on our consolidated balance sheets as: Equipment installment plan receivables, net of allowance for credit losses and imputed discount $ 4,379 $ 4,456 Equipment installment plan receivables due after one year, net of allowance for credit losses and imputed discount 2,209 2,042 EIP receivables, net of allowance for credit losses and imputed discount $ 6,588 $ 6,498 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 December 31, 2024: Originated in 2024 Originated in 2023 Originated prior to 2023 Total EIP Receivables, Net of (in millions) Prime Subprime Prime Subprime Prime Subprime Prime Subprime Total Current - 30 days past due $ 4,213 $ 1,109 $ 1,118 $ 283 $ 18 $ 6 $ 5,349 $ 1,398 $ 6,747 31 - 60 days past due 15 27 6 7 — — 21 34 55 61 - 90 days past due 9 19 4 6 — — 13 25 38 More than 90 days past due 7 17 5 7 1 1 13 25 38 EIP receivables, net of unamortized imputed discount $ 4,244 $ 1,172 $ 1,133 $ 303 $ 19 $ 7 $ 5,396 $ 1,482 $ 6,878 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 year ended December 31, 2024: (in millions) Originated in 2024 Originated in 2023 Originated prior to 2023 Total Write-offs $ 201 $ 309 $ 68 $ 578 Activity for the years ended December 31, 2024, 2023 and 2022, in the allowance for credit losses and unamortized imputed discount balances for the accounts receivable and EIP receivables segments were as follows: December 31, 2024 December 31, 2023 December 31, 2022 (in millions) Accounts Receivable Allowance EIP Receivables Allowance Total Accounts Receivable Allowance EIP Receivables Allowance Total Accounts Receivable Allowance EIP Receivables Allowance Total Allowance for credit losses and imputed discount, beginning of period $ 161 $ 773 $ 934 $ 167 $ 811 $ 978 $ 146 $ 630 $ 776 Bad debt expense 592 600 1,192 440 458 898 433 593 1,026 Write-offs (577) (578) (1,155) (446) (518) (964) (412) (518) (930) Change in imputed discount on short-term and long-term EIP receivables N/A 199 199 N/A 220 220 N/A 262 262 Impact on the imputed discount from sales of EIP receivables N/A (180) (180) N/A (198) (198) N/A (156) (156) Allowance for credit losses and imputed discount, end of period $ 176 $ 814 $ 990 $ 161 $ 773 $ 934 $ 167 $ 811 $ 978 Off-Balance-Sheet Credit Exposures We do not have material off-balance-sheet credit exposures as of December 31, 2024. In connection with the sales of certain service accounts receivable and EIP receivables pursuant to the sale arrangements, we provide guarantees of credit performance (prior to November 1, 2024, this was deferred purchase price assets) included on our 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 credit worthiness, dilutions and recoveries. See Note 5 – Sales of Certain Receivables for further information.

Sales of Certain Receivables

Sales of Certain Receivables	12 Months Ended
	Dec. 31, 2024
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 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”). The maximum funding commitment of the sale arrangement is $1.3 billion. On October 22, 2024, we extended the scheduled expiration date of the EIP Sale Arrangement to November 18, 2025. As of both December 31, 2024 and 2023, the EIP Sale Arrangement provided funding of $1.3 billion. Sales of EIP receivables occur daily and are settled on a monthly basis. In connection with this EIP Sale Arrangement, we formed a wholly owned subsidiary, which qualifies as a bankruptcy remote entity (the “EIP BRE”). Pursuant to the EIP Sale Arrangement, selected receivables are transferred to the EIP BRE. The EIP BRE then sells the receivables to a non-consolidated and unaffiliated third-party entity over which we do not exercise any level of control, nor does the third-party entity qualify as a VIE. Variable Interest Entity We determined that the EIP BRE is a VIE, as its equity investment at risk lacks the obligation to absorb a certain portion of its expected losses. We have a variable interest in the EIP BRE and have determined that we are the primary beneficiary based on our ability to direct the activities that most significantly impact the EIP BRE’s economic performance. Those activities include selecting which receivables are transferred into the EIP BRE and sold in the EIP Sale Arrangement and funding of the EIP BRE. Additionally, our equity interest in the EIP BRE obligates us to absorb losses and gives us the right to receive benefits from the EIP BRE that could potentially be significant to the EIP BRE. Accordingly, we include the balances and results of operations of the EIP BRE in our consolidated financial statements. The following table summarizes the carrying amounts and classification of assets, which consist primarily of the deferred purchase price, and liabilities, which consist of the recourse guarantee, included on our Consolidated Balance Sheets with respect to the EIP BRE: (in millions) December 31, December 31, Other current assets $ 1 $ 348 Other assets — 103 Other current liabilities 81 — Other long-term liabilities 32 — In addition, the EIP BRE is a separate legal entity with its own separate creditors who will be entitled, prior to any liquidation of the EIP BRE, to be satisfied prior to any value in the EIP BRE becoming available to us. Accordingly, the assets of the EIP BRE may not be used to settle our general obligations, and creditors of the EIP BRE have no recourse to our general credit. 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”). The maximum funding commitment of the Service Receivable Sale Arrangement is $950 million, and the facility expires in February 2025. As of both December 31, 2024 and 2023, the Service Receivable Sale Arrangement provided funding of $775 million. Sales of receivables occur daily and are settled on a monthly basis. The receivables consist of service charges currently due from customers and are short-term in nature. 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”). Pursuant to the amended Service Receivable Sale Arrangement, selected receivables are transferred to the Service BRE. The Service BRE then sells the receivables to a non-consolidated and unaffiliated third-party entity over which we do not exercise any level of control and which does not qualify as a VIE. Variable Interest Entity We determined that the Service BRE is a VIE, as its equity investment at risk lacks the obligation to absorb a certain portion of expected losses. We have a variable interest in the Service BRE and have determined that we are the primary beneficiary based on our ability to direct the activities that most significantly impact the Service BRE’s economic performance. Those activities include selecting which receivables are transferred into the Service BRE and sold in the Service Receivable Sale Arrangement and funding the Service BRE. Additionally, our equity interest in the Service BRE obligates us to absorb losses and gives us the right to receive benefits from the Service BRE that could potentially be significant to the Service BRE. Accordingly, we include the balances and results of operations of the Service BRE in our consolidated financial statements. The following table summarizes the carrying amounts and classification of assets, which consists primarily of the deferred purchase price, and liabilities included on our Consolidated Balance Sheets with respect to the Service BRE: (in millions) December 31, December 31, Other current assets $ — $ 209 Other current liabilities 328 373 In addition, the Service BRE is a separate legal entity with its own separate creditors who will be entitled, prior to any liquidation of the Service BRE, to be satisfied prior to any value in the Service BRE becoming available to us. Accordingly, the assets of the Service BRE may not be used to settle our general obligations, and creditors of the Service BRE have no recourse to our general credit. Sales of Receivables The transfers of service accounts receivable and EIP receivables to the non-consolidated entities are accounted for as sales of financial assets. Once identified for sale, the receivable is recorded at the lower of cost or fair value. Upon sale, we derecognize the net carrying amount of the receivables. We recognized the cash proceeds received upon sale in Net cash provided by operating activities on our Consolidated Statements of Cash Flows. On October 22, 2024, we executed an amendment to the EIP Sale Arrangement and an amendment to the Service Receivable Sale Arrangement (together, the “Pledge Amendments”). Prior to the effective date of the Pledge Amendments, the credit enhancement feature of each of the EIP Sale Arrangement and the Service Receivable Sale Arrangement was in the form of a deferred purchase price. Pursuant to the Pledge Amendments, effective on November 1, 2024, the credit enhancement feature of each arrangement is replaced by a recourse guarantee liability, which is collateralized by pledged but unsold receivables. On November 1, 2024, we re-recognized $193 million of gross service accounts receivables and $604 million of gross EIP receivables. Prior to the effective date of the Pledge Amendments, cash proceeds related to beneficial interests in securitization transactions in the form of the deferred purchase price were presented within Net cash used in investing activities on our Consolidated Statements of Cash Flows. Following the effective date of the Pledge Amendments, all cash proceeds associated with sold receivables are recognized within Net cash provided by operating activities on our Consolidated Statements of Cash Flows. The recourse guarantee, and prior to the effective date of the Pledge Amendments, the deferred purchase price, 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 Consolidated Statements of Comprehensive Income. The fair value of the recourse guarantee liabilities is determined based on a discounted cash flow model which uses primarily Level 3 inputs, including customer default rates. As of December 31, 2024, our recourse guarantee liabilities related to the sales of service receivables and EIP receivables was $148 million, as collateralized by $286 million of gross service receivables and $505 million of gross EIP receivables pledged but unsold, which represent our maximum exposure under the recourse guarantee. As of December 31, 2023, our deferred purchase price assets related to the sales of service receivables and EIP receivables was $658 million. The following table summarizes the impact of the sales of certain service receivables and EIP receivables on our Consolidated Balance Sheets: (in millions) December 31, December 31, Derecognized net service accounts receivable and EIP receivables $ 1,616 $ 2,388 Other current assets 1 557 of which, deferred purchase price — 555 Other assets — 103 of which, deferred purchase price — 103 Other current liabilities 409 373 of which, recourse guarantee 116 — Other long-term liabilities 32 — of which, recourse guarantee 32 — Net cash proceeds since inception 1,468 1,583 Of which: Change in net cash proceeds during the year-to-date period (115) (114) Net cash proceeds funded by reinvested collections 1,583 1,697 We recognized losses from sales of receivables, including changes in fair value of the deferred purchase price assets as well as the recourse guarantee liabilities beginning on November 1, 2024, of $62 million, $165 million and $214 million for the years ended December 31, 2024, 2023 and 2022, respectively, in Selling, general and administrative expenses on our Consolidated Statements of Comprehensive Income. Continuing Involvement

Property and Equipment

Property and Equipment	12 Months Ended
	Dec. 31, 2024
Property, Plant and Equipment [Abstract]
Property and Equipment	Note 6 – Property and Equipment The components of property and equipment, excluding amounts transferred to held for sale, were as follows: (in millions) Useful Lives December 31, December 31, Land $ 69 $ 72 Buildings and equipment Up to 30 years 4,377 4,465 Wireless communications systems Up to 20 years 65,778 65,628 Leasehold improvements Up to 10 years 2,588 2,489 Capitalized software Up to 8 years 18,566 22,573 Leased wireless devices Up to 16 months 145 400 Construction in progress N/A 3,377 3,286 Accumulated depreciation and amortization (56,367) (58,481) Property and equipment, net $ 38,533 $ 40,432 Total depreciation expense relating to property and equipment and financing lease right-of-use assets was $12.1 billion, $12.0 billion and $12.7 billion for the years ended December 31, 2024, 2023 and 2022, respectively. These amounts include depreciation expense related to leased wireless devices of $54 million, $170 million and $1.1 billion for the years ended December 31, 2024, 2023 and 2022, respectively. We capitalize interest associated with the acquisition or construction of certain property and equipment and spectrum intangible assets. We recognized capitalized interest of $34 million, $104 million and $61 million for the years ended December 31, 2024, 2023 and 2022, respectively. Asset retirement obligations are primarily for certain legal obligations to remediate leased property on which our network infrastructure and administrative assets are located. Activity in our asset retirement obligations was as follows: (in millions) Year Ended Year Ended Asset retirement obligations, beginning of year $ 1,716 $ 1,852 Liabilities incurred 21 28 Liabilities settled (307) (399) Accretion expense 69 71 Changes in estimated cash flows 36 164 Asset retirement obligations, end of period $ 1,535 $ 1,716 Classified on the consolidated balance sheets as: Other current liabilities $ 109 $ 133 Other long-term liabilities 1,426 1,583 The corresponding assets, net of accumulated depreciation, related to asset retirement obligations were $423 million and $462 million as of December 31, 2024 and 2023, respectively.

Goodwill, Spectrum License Tran

Goodwill, Spectrum License Transactions and Other Intangible Assets	12 Months Ended
	Dec. 31, 2024
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill, Spectrum License Transactions and Other Intangible Assets	Note 7 – Goodwill, Spectrum License Transactions and Other Intangible Assets Goodwill The change in the carrying amount of goodwill for the years ended December 31, 2024 and 2023, is as follows: (in millions) Goodwill Balance as of December 31, 2022, net of accumulated impairment losses of $10,984 $ 12,234 Balance as of December 31, 2023 12,234 Preliminary goodwill from the Ka’ena Acquisition in 2024 771 Balance as of December 31, 2024, net of accumulated impairment losses of $10,984 $ 13,005 Goodwill Impairment Assessment Certain non-financial assets, including goodwill and indefinite-lived intangible assets such as Spectrum licenses, are not required to be measured at fair value on a recurring basis and are reported at carrying value. However, these assets are required to be assessed for impairment when events or circumstances indicate that carrying value may not be recoverable, and at least annually for goodwill and indefinite-lived intangible assets. The nonrecurring measurements of the fair value of these assets, for which observable market information may be limited, are classified within Level 3 of the fair value hierarchy. In the event an impairment is required, the asset is adjusted to its estimated fair value using market-based assumptions, to the extent they are available, as well as other assumptions that may require significant judgment. For our annual assessment of the wireless reporting unit, we employed a qualitative approach. The fair value of the wireless reporting unit was estimated using a market approach, which is based on market capitalization. In addition to performing an assessment under the market approach we also considered any events or change in circumstances that occurred, noting no indication that the fair value of the wireless reporting unit may be below its carrying amount at December 31, 2024. Spectrum Licenses The following table summarizes our spectrum license activity for the years ended December 31, 2024, 2023 and 2022: (in millions) 2024 2023 2022 Spectrum licenses, beginning of year $ 96,707 $ 95,798 $ 92,606 Spectrum license acquisitions 4,822 103 3,152 Spectrum licenses transferred to held for sale (1,024) (2) (64) Costs to clear spectrum 53 808 104 Spectrum licenses, end of year $ 100,558 $ 96,707 $ 95,798 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, on our Consolidated Statements of Cash Flows. Spectrum Auctions In January 2022, the FCC announced that we were the winning bidder of 199 licenses in Auction 110 (3.45 GHz spectrum) for an aggregate purchase price of $2.9 billion. In September 2022, the FCC announced that we were the winning bidder of 7,156 licenses in Auction 108 (2.5 GHz spectrum) for an aggregate price of $304 million. At inception of Auction 108 in June 2022, we deposited $65 million. We paid the FCC the remaining $239 million for the licenses won in the auction in September 2022. On February 29, 2024, the FCC issued to us the licenses won in Auction 108, and substantially all of these licenses were deployed in March 2024. The licenses are included in Spectrum licenses on our Consolidated Balance Sheets as of December 31, 2024. Spectrum Exchange Transactions During the year ended December 31, 2024, we recognized non-cash spectrum license acquisitions associated with the closing of certain spectrum exchange transactions of $1.2 billion, including $985 million associated with the closing of an agreement with a third party for the exchange of certain of our 39 GHz spectrum licenses for certain of their 24 GHz spectrum license on October 15, 2024. During the year ended December 31, 2024, we recognized gains associated with the closing of certain spectrum exchange transactions of $202 million, including a $137 million gain associated with the closing of an agreement with a third party for the exchange of certain of our 39 GHz spectrum licenses for certain of their 24 GHz spectrum license on October 15, 2024, as a reduction to Selling, general and administrative expenses on our Consolidated Statements of Comprehensive Income. There were no gains or losses associated with spectrum exchange transactions during the years ended December 31, 2023 and 2022. License Purchase Agreements DISH Network Corporation On July 1, 2020, we and DISH Network Corporation (“DISH”) entered into a License Purchase Agreement (the “DISH License Purchase Agreement”) pursuant to which DISH agreed to purchase certain 800 MHz spectrum licenses for a total of approximately $3.6 billion. On October 15, 2023, we and DISH entered into an amendment (the “LPA Amendment”) to the DISH License Purchase Agreement pursuant to which, among other things, the parties agreed that (1) DISH will pay us a $100 million non-refundable extension fee (in lieu of the approximately $72 million termination fee that had previously been agreed to), (2) the closing for the purchase of the spectrum licenses by DISH will occur no later than April 1, 2024, (3) if DISH has not purchased the spectrum licenses by such date for any reason (including failure to receive the required FCC approval prior to such date), then the DISH License Purchase Agreement will automatically terminate, and we will retain the $100 million extension fee, (4) if DISH does purchase the spectrum by April 1, 2024, the $100 million extension fee will be credited against the $3.6 billion purchase price, and (5) we are permitted to commence auction of the spectrum prior to April 1, 2024 at our discretion (and subject to DISH’s purchase right). The LPA Amendment was approved by the Court and became effective on October 23, 2023. On October 25, 2023, we received a payment of $100 million from DISH for the extension fee and recorded a corresponding liability within Other current liabilities on our Consolidated Balance Sheets. DISH did not purchase the 800 MHz spectrum by April 1, 2024. As such, we recognized a gain for the $100 million extension fee previously paid by DISH during the year ended December 31, 2024, within Selling, general and administrative expenses on our Consolidated Statements of Comprehensive Income and relieved the liability that was initially recorded upon receipt of the payment. On October 1, 2024, we concluded the auction process for the disposition of the spectrum as required under the final judgment agreed to by us, Deutsche Telekom AG (“DT”), Sprint LLC, SoftBank Group Corp. (“SoftBank”) and DISH with the U.S. District Court for the District of Columbia, which was approved by the Court on April 1, 2020, to offer the licenses for sale. We did not receive a qualifying bid and have been relieved of the obligation to sell the spectrum licenses. We are currently exploring alternatives to sell or utilize the spectrum licenses. Channel 51 License Co LLC and LB License Co, LLC On August 8, 2022, we, Channel 51 License Co LLC and LB License Co, LLC (together with Channel 51 License Co LLC, the “Sellers”) entered into License Purchase Agreements pursuant to which we will acquire spectrum in the 600 MHz band from the Sellers in exchange for total cash consideration of $3.5 billion. The licenses will be acquired without any associated networks and are currently being utilized by us through exclusive leasing arrangements with the Sellers. On March 30, 2023, we and the Sellers entered into Amended and Restated License Purchase Agreements pursuant to which we and the Sellers agreed to separate the transaction into two tranches of licenses, with the closings on the acquisitions of certain licenses in Chicago, Dallas and New Orleans being deferred in order to potentially expedite the regulatory approval process for the remainder of the licenses. Subsequently, on August 25, 2023, we and the Sellers entered into Amendments No. 1 to the Amended and Restated License Purchase Agreements, which deferred the closings of certain additional licenses in Chicago and Dallas into the second closing tranche. Together, the licenses with closings deferred into the second closing tranche represent $1.1 billion of the aggregate $3.5 billion cash consideration. The licenses being acquired by us, and the total consideration being paid for the licenses, remain the same under the original License Purchase Agreements and subsequent amendments. The FCC approved the purchase of the first tranche on December 29, 2023. The first tranche closed on June 24, 2024, and the associated payment of $2.4 billion was made on August 5, 2024. The FCC approved the purchase of the Dallas licenses included in the second tranche on October 22, 2024. The purchase of the Dallas licenses closed on December 6, 2024, and the associated payment of $541 million was made on the same day. We anticipate that the remaining deferred licenses from the second tranche of $604 million will close in 2025. The parties have agreed that each of the closings will occur within 180 days after the receipt of the applicable required regulatory approvals, and payment of each portion of the aggregate $3.5 billion purchase price will occur no later than 40 days after the date of each respective closing. Comcast Corporation On September 12, 2023, we entered into a 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 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. We anticipate the closing will occur in the first half of 2028. The final purchase price will be determined, in the aggregate and on a per license basis, based on the set of licenses subject to the License Purchase Agreement 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 licenses, totaling $2.1 billion (the “Optional Sale Licenses”), from the 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 licenses are subject to an exclusive leasing arrangement between us and Comcast, which were entered into contemporaneously with the License Purchase Agreement. If Comcast elects to remove an Optional Sale License from the License Purchase Agreement, the associated lease for such Optional Sale License will terminate, but no sooner than two years from the date of the 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 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. N77 License Co LLC On September 10, 2024, we entered into a License Purchase Agreement with N77 License Co LLC (“Buyer”), pursuant to which Buyer has the option to purchase all or a portion of our remaining 3.45 GHz spectrum licenses in exchange for a range of cash consideration, with the specific licenses sold to be determined based upon the amount of committed financing raised by Buyer. As of December 31, 2024 and 2023, the licenses subject to the License Purchase Agreement were held at cost of $2.7 billion in Spectrum licenses on our Consolidated Balance Sheets. We maintain the right to terminate the License Purchase Agreement no later than February 7, 2025, as we did not receive written notice of committed financing as of December 9, 2024, from the Buyer at or above a certain target level of cash consideration. The transaction is subject to FCC approval. We do not expect the transaction to have a material impact on our Consolidated Statements of Comprehensive Income. Impairment Assessment For our assessment of Spectrum license impairment, we employed a qualitative approach. No events or change in circumstances have occurred that indicate the fair value of the Spectrum licenses may be below its carrying amount at December 31, 2024. Other Intangible Assets The components of Other intangible assets were as follows: Useful Lives December 31, 2024 December 31, 2023 (in millions) Gross Amount Accumulated Amortization Net Amount Gross Amount Accumulated Amortization Net Amount Customer relationships (1) Up to 8 years $ 5,427 $ (4,123) $ 1,304 $ 4,883 $ (3,451) $ 1,432 Reacquired rights Up to 9 years 770 (323) 447 770 (231) 539 Tradenames and patents (1) Up to 19 years 338 (157) 181 208 (134) 74 Favorable spectrum leases Up to 27 years 620 (169) 451 686 (148) 538 Other (1) Up to 10 years 478 (349) 129 353 (318) 35 Other intangible assets $ 7,633 $ (5,121) $ 2,512 $ 6,900 $ (4,282) $ 2,618 (1) Includes intangible assets acquired in the Ka’ena Acquisition. See Note 2 - Business Combinations for more information. Amortization expense for intangible assets subject to amortization was $857 million, $888 million and $1.2 billion for the years ended December 31, 2024, 2023 and 2022, respectively. The estimated aggregate future amortization expense for intangible assets subject to amortization is summarized below: (in millions) Estimated Future Amortization Twelve Months Ending December 31, 2025 $ 749 2026 571 2027 404 2028 253 2029 171 Thereafter 364 Total $ 2,512 Substantially all of the estimated future amortization expense is associated with intangible assets acquired through our business combinations.

Fair Value Measurements

Fair Value Measurements	12 Months Ended
	Dec. 31, 2024
Fair Value Disclosures [Abstract]
Fair Value Measurements	Note 8 – 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 imputed 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 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 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 value of our payments on foreign-denominated debt in USD and to mitigate the impact of foreign currency transaction gains and losses. On April 30, 2024, we entered into cross-currency swap agreements, with the same notional amounts as the EUR-denominated debt issuance on May 8, 2024, to effectively convert €2.0 billion to USD borrowings, with the same maturities of five eight Accordingly, all changes in the fair value of the swaps will be initially recorded through Accumulated other comprehensive loss on our 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 income (expense), net on our 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 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 Consolidated Statements of Comprehensive Income. If an amount remains in Accumulated other comprehensive loss on our 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: (in millions) Year Ended Other income (expense), net Pre-tax transaction gain on remeasurement of EUR-denominated debt $ 79 Amount recognized in Other income (expense), net reclassified from Accumulated other comprehensive loss (79) Accumulated other comprehensive loss Amount recognized in Accumulated other comprehensive loss reclassified to Other income (expense), net $ 79 Loss associated with the change in fair value of cross-currency swaps recognized in Accumulated other comprehensive loss (58) 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 interest rate lock derivatives, which were terminated in April 2020, of $960 million and $1.1 billion are presented in Accumulated other comprehensive loss on our Consolidated Balance Sheets as of December 31, 2024 and 2023, respectively. For the years ended December 31, 2024, 2023 and 2022, $236 million, $219 million and $203 million, respectively, were amortized from Accumulated other comprehensive loss into Interest expense, net, on our Consolidated Statements of Comprehensive Income. We expect to amortize $254 million of the Accumulated other comprehensive loss associated with the derivatives into Interest expense, net, over the 12 months ending December 31, 2025. Recourse Guarantee Liabilities and Deferred Purchase Price Assets In connection with the sales of certain service and EIP accounts receivable, we have recourse guarantee liabilities, and prior to the effective date of the Pledge Amendments, deferred purchase price assets, measured at fair value on a recurring basis that are based on a discounted cash flow model using unobservable Level 3 inputs, including estimated customer default rates and credit worthiness, dilutions and recoveries. See Note 5 – Sales of Certain Receivables for further information. The carrying amount of our recourse guarantee liabilities was $148 million as of December 31, 2024. The carrying amount of our deferred purchase price assets was $658 million as of December 31, 2023. Both of which are included on our Consolidated Balance Sheets for the periods indicated. 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 market interest rates of instruments with similar terms and maturities. Accordingly, our Senior Notes to affiliates were classified as Level 2 within the fair value hierarchy. The fair value of our Senior Notes to third parties (EUR-denominated) and asset-backed notes (“ABS Notes”) was 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. 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 and ABS Notes. The fair value estimates were based on information available as of December 31, 2024 and 2023. 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 included on our Consolidated Balance Sheets were as follows: (in millions) Level within the Fair Value Hierarchy December 31, 2024 December 31, 2023 Carrying Amount Fair Value Carrying Amount Fair Value Liabilities: Senior Notes to third parties 1 $ 71,783 $ 65,631 $ 70,493 $ 65,962 Senior Notes to third parties (EUR-denominated) 2 2,058 2,125 — — Senior Notes to affiliates 2 1,497 1,491 1,496 1,499 Senior Secured Notes to third parties 1 1,361 1,330 2,281 2,207 ABS Notes to third parties 2 1,566 1,570 748 748

Debt

Debt	12 Months Ended
	Dec. 31, 2024
Debt Disclosure [Abstract]
Debt	Note 9 – Debt Debt was as follows: (in millions) December 31, December 31, 7.125% Senior Notes due 2024 $ — $ 2,500 3.500% Senior Notes due 2025 3,000 3,000 4.738% Series 2018-1 A-1 Notes due 2025 131 656 7.625% Senior Notes due 2025 — 1,500 1.500% Senior Notes due 2026 1,000 1,000 2.250% Senior Notes due 2026 1,800 1,800 2.625% Senior Notes due 2026 1,200 1,200 7.625% Senior Notes due 2026 1,500 1,500 3.750% Senior Notes due 2027 4,000 4,000 5.375% Senior Notes due 2027 500 500 2.050% Senior Notes due 2028 1,750 1,750 4.750% Senior Notes due 2028 1,500 1,500 4.750% Senior Notes to affiliates due 2028 1,500 1,500 4.800% Senior Notes due 2028 900 900 4.910% Class A Senior ABS Notes due 2028 570 750 4.950% Senior Notes due 2028 1,000 1,000 5.152% Series 2018-1 A-2 Notes due 2028 1,194 1,562 6.875% Senior Notes due 2028 2,475 2,475 2.400% Senior Notes due 2029 500 500 2.625% Senior Notes due 2029 1,000 1,000 3.375% Senior Notes due 2029 2,350 2,350 3.550% Senior Notes due 2029 (EUR-denominated) 621 — 4.200% Senior Notes due 2029 700 — 4.250% Class A Senior ABS Notes due 2029 500 — 4.850% Senior Notes due 2029 1,000 — 5.050% Class A Senior ABS Notes due 2029 500 — 3.875% Senior Notes due 2030 7,000 7,000 2.250% Senior Notes due 2031 1,000 1,000 2.550% Senior Notes due 2031 2,500 2,500 2.875% Senior Notes due 2031 1,000 1,000 3.500% Senior Notes due 2031 2,450 2,450 2.700% Senior Notes due 2032 1,000 1,000 3.700% Senior Notes due 2032 (EUR-denominated) 777 — 8.750% Senior Notes due 2032 2,000 2,000 5.050% Senior Notes due 2033 2,600 2,600 5.200% Senior Notes due 2033 1,250 1,250 5.150% Senior Notes due 2034 1,250 — 5.750% Senior Notes due 2034 1,000 1,000 4.700% Senior Notes due 2035 900 — 3.850% Senior Notes due 2036 (EUR-denominated) 673 — 4.375% Senior Notes due 2040 2,000 2,000 3.000% Senior Notes due 2041 2,500 2,500 4.500% Senior Notes due 2050 3,000 3,000 3.300% Senior Notes due 2051 3,000 3,000 3.400% Senior Notes due 2052 2,800 2,800 5.650% Senior Notes due 2053 1,750 1,750 5.750% Senior Notes due 2054 1,250 1,250 6.000% Senior Notes due 2054 1,000 1,000 5.250% Senior Notes due 2055 900 — 5.500% Senior Notes due 2055 750 — 3.600% Senior Notes due 2060 1,700 1,700 5.800% Senior Notes due 2062 750 750 Unamortized premium on debt to third parties 775 1,011 Unamortized discount on debt to third parties (223) (223) Debt issuance costs and consent fees (278) (263) Total debt 78,265 75,018 Less: Current portion of Senior Notes 4,068 3,619 Total long-term debt $ 74,197 $ 71,399 Long-term debt was classified as follows: (in millions) December 31, December 31, Long-term debt $ 72,700 $ 69,903 Long-term debt to affiliates 1,497 1,496 Total long-term debt $ 74,197 $ 71,399 Our effective interest rate, excluding the impact of derivatives and capitalized interest, was approximately 4.1% and 4.0% on weighted-average debt outstanding of $78.3 billion and $75.4 billion for the years ended December 31, 2024 and 2023, 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. Senior Notes The Senior Notes are guaranteed on a senior unsecured basis by the Company and certain of our consolidated subsidiaries. They are redeemable at our discretion, in whole or in part, at any time. The redemption price is calculated by reference to the date on which such notes are redeemed and generally includes a premium that steps down gradually as the Senior Notes approach their par call date, on or after which they are redeemable at par. The amount of time by which the par call date precedes the maturity date of the respective series of Senior Notes varies from one month to three years. Issuances and Borrowings During the year ended December 31, 2024, we issued the following Senior Notes and ABS Notes: (in millions) Principal Issuances Discounts and Issuance Costs Net Proceeds from Issuance of Long-Term Debt Issue Date 4.850% Senior Notes due 2029 $ 1,000 $ (6) $ 994 January 12, 2024 5.150% Senior Notes due 2034 1,250 (11) 1,239 January 12, 2024 5.500% Senior Notes due 2055 750 (7) 743 January 12, 2024 3.550% Senior Notes due 2029 (EUR-denominated) 645 (3) 642 May 8, 2024 3.700% Senior Notes due 2032 (EUR-denominated) 806 (4) 802 May 8, 2024 3.850% Senior Notes due 2036 (EUR-denominated) 699 (7) 692 May 8, 2024 4.200% Senior Notes due 2029 700 (4) 696 September 26, 2024 4.700% Senior Notes due 2035 900 (6) 894 September 26, 2024 5.250% Senior Notes due 2055 900 (10) 890 September 26, 2024 Total of Senior Notes issued $ 7,650 $ (58) $ 7,592 5.050% Class A Senior ABS Notes due 2029 $ 500 $ (3) $ 497 February 14, 2024 4.250% Class A Senior ABS Notes due 2029 500 (2) 498 October 9, 2024 Total of ABS Notes issued $ 1,000 $ (5) $ 995 Credit Facilities We maintain a revolving credit facility (the “Revolving Credit Facility”) with an aggregate commitment amount of $7.5 billion, including a letter of credit sub-facility of up to $1.5 billion and a swingline loan sub-facility of up to $500 million. As of December 31, 2024 and 2023, we did not have an outstanding balance under the Revolving Credit Facility. Note Redemptions and Repayments During the year ended December 31, 2024, we made the following note redemptions and repayments: (in millions) Principal Amount Payment Date 7.125% Senior Notes due 2024 $ 2,500 June 15, 2024 7.625% Senior Notes due 2025 1,500 November 15, 2024 Total Redemptions $ 4,000 4.738% Secured Series 2018-1 A-1 Notes due 2025 $ 525 Various 5.152% Series 2018-1 A-2 Notes due 2028 368 Various 4.910% Class A Senior ABS Notes due 2028 180 Various Total Repayments $ 1,073 Asset-backed Notes In connection with issuing the ABS Notes, 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. The ABS BRE’s residual interest in the ABS Trust represents the rights to all funds not needed to make required payments on the ABS Notes and other related payments and expenses. Under the terms of the ABS Notes, our wholly owned subsidiary, T-Mobile Financial LLC (“FinCo”), and certain of our other wholly owned subsidiaries (collectively, the “Originators”) transfer EIP receivables to the ABS BRE, which in turn transfers such receivables to the ABS Trust, which issued the ABS Notes. The Class A senior ABS Notes have an expected weighted average life of approximately 2.5 years. Under the terms of the transaction, there is a two-year revolving period during which we may transfer additional receivables to the ABS Entities as collections on the receivables are received. The EIP receivables transferred to the ABS Entities and related assets, consisting primarily of restricted cash, will only be available for payment of the ABS Notes and expenses related thereto, payments to the Originators in respect of additional transfers of device payment plan agreement receivables, and other obligations arising from our ABS Notes transactions, and will not be available to pay our other obligations until the associated ABS Notes and related obligations are satisfied. The third-party investors in the Class A senior ABS Notes have legal recourse only to the assets of the ABS Trust securing the ABS Notes and do not have any recourse to T-Mobile with respect to the payment of principal and interest. The receivables transferred to the ABS Trust will only be available for payment of the ABS Notes and other obligations arising from the transaction and will not be available to pay any obligations or claims of T-Mobile’s creditors. Under a parent support agreement, T-Mobile has agreed to guarantee the performance of the obligations of FinCo, which will continue to service the receivables, and the other T-Mobile entities participating in the transaction. However, T-Mobile does not guarantee any principal or interest on the ABS Notes or any payments on the underlying EIP receivables. Cash collections on the EIP receivables are required at certain specified times to be placed into segregated accounts. Deposits to the segregated accounts are considered restricted cash and are included in Other current assets on our Consolidated Balance Sheets. As of December 31, 2024, $1.6 billion of our ABS Notes were secured in total by $2.0 billion of gross EIP receivables and future collections on such receivables. Our ABS Notes and the assets securing this debt are included on our Consolidated Balance Sheets. The expected maturities of our ABS Notes as of December 31, 2024, were as follows: (in millions) Expected Maturities 2025 $ 570 2026 594 2027 406 Total $ 1,570 Variable Interest Entities The ABS Entities meet 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. Those activities include selecting which receivables are transferred into the ABS Entities, servicing such receivables, and funding of the ABS Entities. Additionally, our equity interest and residual interest in the ABS BRE and the ABS Trust, respectively, obligate us to absorb losses and give us the right to receive benefits from the ABS Entities that could potentially be significant to the ABS Entities. Accordingly, we include the balances and results of operations of the ABS Entities in our consolidated financial statements. The following table summarizes the carrying amounts and classification of assets and liabilities included in our Consolidated Balance Sheets with respect to the ABS Entities: (in millions) December 31, December 31, Assets Equipment installment plan receivables, net $ 1,472 $ 739 Equipment installment plan receivables due after one year, net 352 168 Other current assets 151 101 Liabilities Accounts payable and accrued liabilities 2 1 Short-term debt 570 198 Long-term debt 996 550 See Note 4 – Receivables and Related Allowance for Credit Losses for additional information on the EIP receivables used to secure the ABS Notes. Spectrum Financing On April 1, 2020, in connection with the closing of the Merger, we assumed Sprint’s spectrum-backed notes, which are collateralized by the acquired, directly held and third-party leased Spectrum licenses (collectively, the “Spectrum Portfolio”) transferred to wholly owned bankruptcy-remote special purpose entities (collectively, the “Spectrum Financing SPEs”). As of December 31, 2024 and 2023, the total outstanding obligations under these Notes were $1.3 billion and $2.2 billion, respectively. In October 2016, certain subsidiaries of Sprint Communications, Inc. transferred the Spectrum Portfolio to the Spectrum Financing SPEs, which was used as collateral to raise an initial $3.5 billion in senior secured notes (the “2016 Spectrum-Backed Notes”) bearing interest at 3.360% per annum under a $7.0 billion securitization program. The 2016 Spectrum-Backed Notes were repayable over a five-year term, with interest-only payments over the first four quarters and amortizing quarterly principal payments thereafter commencing December 2017 through September 2021. We fully repaid the 2016 Spectrum-Backed Notes in 2021. In March 2018, Sprint issued approximately $3.9 billion in aggregate principal amount of senior secured notes (the “2018 Spectrum-Backed Notes” and together with the 2016 Spectrum-Backed Notes, the “Spectrum-Backed Notes”) under the existing $7.0 billion securitization program, consisting of two series of senior secured notes. The first series of notes totaled $2.1 billion in aggregate principal amount, bears interest at 4.738% per annum, and has quarterly interest-only payments until June 2021, with additional quarterly principal payments commencing in June 2021 through March 2025. As of December 31, 2024, $131 million of the aggregate principal amount was classified as Short-term debt on our Consolidated Balance Sheets. The second series of notes totaled approximately $1.8 billion in aggregate principal amount, bears interest at 5.152% per annum, and has quarterly interest-only payments until June 2023, with additional quarterly principal payments commencing in June 2023 through March 2028. As of December 31, 2024, $368 million of the aggregate principal amount was classified as Short-term debt on our Consolidated Balance Sheets. The Spectrum Portfolio, which also serves as collateral for the Spectrum-Backed Notes, remains substantially identical to the original portfolio from October 2016. Simultaneously with the October 2016 offering, Sprint Communications, Inc. entered into a long-term lease with the Spectrum Financing SPEs for the ongoing use of the Spectrum Portfolio. Sprint Communications, Inc. is required to make monthly lease payments to the Spectrum Financing SPEs in an aggregate amount that is market-based relative to the spectrum usage rights as of the closing date and equal to $165 million per month. The lease payments, which are guaranteed by T-Mobile subsidiaries subsequent to the Merger, are sufficient to service all outstanding series of the 2016 Spectrum-Backed Notes and the lease also constitutes collateral for the senior secured notes. Because the Spectrum Financing SPEs are wholly owned T-Mobile subsidiaries subsequent to the Merger, these entities are consolidated and all intercompany activity has been eliminated. Each Spectrum Financing SPE is a separate legal entity with its own separate creditors who will be entitled, prior to and upon the liquidation of the respective Spectrum Financing SPE, to be satisfied out of the Spectrum Financing SPE’s assets prior to any assets of such Spectrum Financing SPE becoming available to T-Mobile. Accordingly, the assets of each Spectrum Financing SPE are not available to satisfy the debts and other obligations owed to other creditors of T-Mobile until the obligations of such Spectrum Financing SPE under the Spectrum-Backed Notes are paid in full. Certain provisions of the Spectrum Financing facility require us to maintain specified cash collateral balances. Amounts associated with these balances are considered to be restricted cash. 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. Commercial Paper On July 25, 2023, we established an unsecured short-term commercial paper program with the ability to borrow up to $2.0 billion from time to time. This program supplements our other available external financing arrangements, and proceeds are expected to be used for general corporate purposes. As of December 31, 2024 and 2023, there was no outstanding balance under this program. Standby Letters of Credit For the purposes of securing our obligations to provide device insurance services and for the purposes of securing our general purpose obligations, we maintain an agreement for standby letters of credit with certain financial institutions. Our outstanding standby letters of credit were $152 million and $238 million as of December 31, 2024 and 2023, respectively. ECA Facility Subsequent to December 31, 2024, on January 31, 2025, our wholly owned subsidiary, T-Mobile USA, Inc., entered into a credit agreement with certain financial institutions, backed by an Export Credit Agency (the “ECA Facility”), providing for a loan of up to $1.0 billion to finance network equipment-related purchases. The obligations under the ECA Facility are also guaranteed by us and by all of our wholly owned domestic restricted subsidiaries (subject to customary exceptions). Any borrowing under the ECA Facility will mature on March 15, 2036. As of January 31, 2025, the ECA Facility is undrawn.

Tower Obligations

Tower Obligations	12 Months Ended
	Dec. 31, 2024
Leases [Abstract]
Tower Obligations	Note 10 – 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 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 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 the Merger, 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 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 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 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 Consolidated Balance Sheets: (in millions) December 31, December 31, Property and equipment, net $ 2,069 $ 2,220 Tower obligations 3,664 3,777 Other long-term liabilities 554 554 Future minimum payments related to the tower obligations are approximately $380 million for the 12-month period ending December 31, 2025, $788 million in total for both of the 12-month periods ending December 31, 2026 and 2027, $835 million in total for both of the 12-month periods ending December 31, 2028 and 2029, and $3.7 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 900 sites and have included lease liabilities of $251 million in our Operating lease liabilities as of December 31, 2024.

Revenue from Contracts with Cus

Revenue from Contracts with Customers	12 Months Ended
	Dec. 31, 2024
Revenue from Contract with Customer [Abstract]
Revenue from Contracts with Customers	Note 11 – Revenue from Contracts with Customers Disaggregation of Revenue We provide wireless communications services to three primary categories of customers: • Postpaid customers generally include customers who are qualified to pay after receiving wireless communications services utilizing phones, High Speed Internet, mobile internet devices (including tablets and hotspots), wearables, DIGITS and other connected devices (including SyncUP and IoT); • Prepaid customers generally include customers who pay for wireless communications services in advance; and • Wholesale customers include Machine-to-Machine and Mobile Virtual Network Operator customers that operate on our network but are managed by wholesale partners. Postpaid service revenues, including postpaid phone revenues and postpaid other revenues, were as follows: Year Ended December 31, (in millions) 2024 2023 2022 Postpaid service revenues Postpaid phone revenues $ 45,762 $ 43,449 $ 41,711 Postpaid other revenues 6,578 5,243 4,208 Total postpaid service revenues $ 52,340 $ 48,692 $ 45,919 The balances presented in each revenue line item on our 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. Revenue generated from the lease of mobile communication devices is included in Equipment revenues on our Consolidated Statements of Comprehensive Income. Contract Balances The contract asset and contract liability balances from contracts with customers as of December 31, 2024 and 2023, were as follows: (in millions) Contract Contract Balance as of December 31, 2023 $ 607 $ 812 Balance as of December 31, 2024 720 1,219 Change $ 113 $ 407 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 $492 million and $495 million as of December 31, 2024 and 2023, respectively, was included in Other current assets on our 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, including customers acquired through the Ka’ena Acquisition. Contract liabilities are primarily included in Deferred revenue on our Consolidated Balance Sheets. Revenues for the years ended December 31, 2024, 2023 and 2022, include the following: Year Ended December 31, (in millions) 2024 2023 2022 Amounts included in the beginning of year contract liability balance $ 787 $ 747 $ 760 Remaining Performance Obligations As of December 31, 2024, 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 $1.5 billion. We expect to recognize revenue as the service is provided on these postpaid contracts over an extended contract term of 24 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 December 31, 2024, the aggregate amount of the contractual minimum consideration for wholesale, roaming and service contracts is $1.4 billion, $1.4 billion and $1.7 billion for 2025, 2026 and 2027 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 $2.0 billion and $2.1 billion for December 31, 2024 and 2023, respectively, and is included in Other assets on our Consolidated Balance Sheets. Deferred contract costs incurred to obtain postpaid service contracts are amortized over a period of 24 months. The amortization period is monitored to reflect any significant change in assumptions. Amortization of deferred contract costs included in Selling, general and administrative expenses on our Consolidated Statements of Comprehensive Income were $2.0 billion, $1.8 billion and $1.5 billion for the years ended December 31, 2024, 2023 and 2022, respectively. 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 years ended December 31, 2024, 2023 and 2022.

Segment Reporting

Segment Reporting	12 Months Ended
	Dec. 31, 2024
Segment Reporting [Abstract]
Segment Reporting	Note 12 – 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 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 Note 1 – Summary of Significant Accounting Policies . Our CODM is our President and Chief Executive Officer, G. Michael Sievert. The CODM uses Net income, as reported on our 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: Year Ended December 31, (in millions) 2024 2023 2022 Total revenues $ 81,400 $ 78,558 $ 79,571 Less: Significant and other segment expenses Cost of equipment sales 18,882 18,533 21,540 Employee expenses 7,041 7,629 7,626 Lease expense 5,066 5,398 6,998 Advertising expense 3,067 2,515 2,306 Bad debt expense 1,192 898 1,026 Other segment items (1) 15,223 16,526 18,317 Impairment expense — — 477 (Gain) loss on disposal group held for sale — (25) 1,087 Depreciation and amortization 12,919 12,818 13,651 Interest expense, net 3,411 3,335 3,364 Other (income) expense, net (113) (68) 33 Income tax expense 3,373 2,682 556 Segment net income $ 11,339 $ 8,317 $ 2,590 (1)

Employee Compensation and Benef

Employee Compensation and Benefit Plans	12 Months Ended
	Dec. 31, 2024
Share-Based Payment Arrangement [Abstract]
Employee Compensation and Benefit Plans	Note 13 – Employee Compensation and Benefit Plans In June 2023, the stockholders of the Company approved the T-Mobile US, Inc. 2023 Incentive Award Plan (the “2023 Plan”), which replaced the 2013 Omnibus Incentive Plan and the Sprint Corporation Amended and Restated 2015 Omnibus Incentive Plan that T-Mobile assumed in connection with the closing of the Merger (collectively, with the 2023 Plan, the “Incentive Plans”). Under the 2023 Plan, we are authorized to issue up to 33 million shares of our common stock and can grant stock options, stock appreciation rights, restricted stock, RSUs and PRSUs to eligible employees, consultants, advisors and non-employee directors. As of December 31, 2024, there were approximately 29 million shares of common stock available for future grants under the 2023 Plan. We grant RSUs to eligible employees, key executives and certain non-employee directors and PRSUs to eligible key executives. RSUs entitle the grantee to receive shares of our common stock upon vesting (with vesting generally occurring annually over a three-year service period), subject to continued service through the applicable vesting date. PRSUs entitle the holder to receive shares of our common stock at the end of a performance period of generally up to three years, if the applicable performance goals are achieved, and generally subject to continued service through the applicable performance period. The number of shares ultimately received by the holder of PRSUs is dependent on our business performance against the specified performance goal(s) over a pre-established performance period. We also maintain an employee stock purchase plan (“ESPP”), under which eligible employees can purchase our common stock at a discounted price. Stock-based compensation expense and related income tax benefits were as follows: As of and for the Year Ended December 31, (in millions, except shares, per share and contractual life amounts) 2024 2023 2022 Stock-based compensation expense $ 649 $ 667 $ 596 Income tax benefit related to stock-based compensation $ 129 $ 130 $ 114 Weighted-average fair value per stock award granted $ 162.99 $ 143.09 $ 126.89 Unrecognized compensation expense $ 645 $ 637 $ 635 Weighted-average period to be recognized (years) 1.8 1.8 1.8 Fair value of stock awards vested $ 820 $ 889 $ 743 Stock Awards The following activity occurred under the Incentive Plans during the year ended December 31, 2024: Time-Based Restricted Stock Units (in millions, except shares, per share and contractual life amounts) Number of Units or Awards Weighted-Average Grant Date Fair Value Weighted-Average Remaining Contractual Term (Years) Aggregate Intrinsic Value Nonvested, December 31, 2023 7,755,943 $ 136.67 0.9 $ 1,244 Prior year grant adjustment (351) 142.60 Granted 3,775,434 163.72 Vested (4,375,499) 135.88 Forfeited (518,292) 149.33 Nonvested, December 31, 2024 6,637,235 151.55 0.8 1,465 Performance-Based Restricted Stock Units (in millions, except shares, per share and contractual life amounts) Number of Units or Awards Weighted-Average Grant Date Fair Value Weighted-Average Remaining Contractual Term (Years) Aggregate Intrinsic Value Nonvested, December 31, 2023 689,806 $ 145.32 1.0 $ 111 Granted 146,154 164.65 Performance award achievement adjustments (1) 95,503 131.26 Vested (372,099) 127.55 Nonvested, December 31, 2024 559,364 159.79 0.9 123 (1) Represents PRSUs granted prior to 2024 for which the performance achievement period was completed in 2024, resulting in incremental unit awards. These PRSU awards are also included in the amount vested in 2024. PRSUs included in the table above are shown at target. Share payout can range from 0% to 200% based on different performance outcomes. Weighted-average grant date fair value of RSU and PRSU awards assumed through acquisition is based on the fair value on the date assumed. Payment of the underlying shares in connection with the vesting of RSU and PRSU awards generally triggers a tax obligation for the employee, which is required to be remitted to the relevant tax authorities. With respect to RSUs and PRSUs settled in shares, we have agreed to withhold shares of common stock otherwise issuable under the RSU and PRSU awards to cover certain of these tax obligations, with the net shares issued to the employee accounted for as outstanding common stock. We withheld 1,552,111, 2,027,800 and 1,900,710 shares of common stock to cover tax obligations associated with the payment of shares upon vesting of stock awards and remitted cash of $269 million, $297 million and $243 million to the appropriate tax authorities for the years ended December 31, 2024, 2023 and 2022, respectively. Employee Stock Purchase Plan Our ESPP allows eligible employees to contribute up to 15% of their eligible earnings toward the semi-annual purchase of our shares of common stock at a discounted price, subject to an annual maximum dollar amount. Employees can purchase stock at a 15% discount applied to the closing stock price on the first or last day of the six-month offering period, whichever price is lower. The number of shares issued under our ESPP was 1,519,242, 1,771,475 and 2,079,086 for the years ended December 31, 2024, 2023 and 2022, respectively. In June 2023, the stockholders of the Company approved an amendment to our ESPP plan, increasing the share reserve to 14,000,000. As of December 31, 2024, the number of securities remaining available for future sale and issuance under the ESPP was 11,772,709. Pension and Other Postretirement Benefits Plans On December 20, 2024, we settled $572 million of our Sprint Retirement Pension Plan retiree obligations, resulting in a gain of $80 million, recognized within Other income (expense), net on our Consolidated Statements of Comprehensive Income. This partial plan settlement is the result of us purchasing a nonparticipating annuity that involves the transfer of significant risk from us to the insurance company (commonly referred to as a “buy-out”). This transaction is an irrevocable action, relieves us of our responsibility for the postretirement benefit obligations that were settled, and eliminates the risks related to the obligation and the assets used to effect the settlement. The objective for the investment portfolio of the Pension Plan is to achieve a long-term nominal rate of return, net of fees, that exceeds the Pension Plan's long-term expected rate of return on investments for funding purposes. To meet this objective, our investment strategy is governed by an asset allocation policy, whereby a targeted allocation percentage is assigned to each asset class as follows: 48% to equities; 39% to fixed income investments; and 13% to real estate, infrastructure and private assets. Actual allocations are allowed to deviate from target allocation percentages within a range for each asset class as defined in the investment policy. The long-term expected rate of return on plan assets was 7% for both the years ended December 31, 2024 and 2023, while the actual rate of return on plan assets was 6% and 11% for the years ended December 31, 2024 and 2023, respectively. The long-term expected rate of return on investments for funding purposes is 8% for the year ended December 31, 2025. The components of net benefit recognized for the Pension Plan were as follows: Year Ended December 31, (in millions) 2024 2023 2022 Interest on projected benefit obligations $ 83 $ 86 $ 65 Gain on settlement and amortization of actuarial gain (119) (59) — Expected return on pension plan assets (99) (97) (71) Net pension benefit $ (135) $ (70) $ (6) The net benefit associated with the Pension Plan is included in Other income (expense), net on our Consolidated Statements of Comprehensive Income. Investments of the Pension Plan are measured at fair value on a recurring basis, which is determined using quoted market prices or estimated fair values. As of December 31, 2024, 26% of the investment portfolio was valued at quoted prices in active markets for identical assets, 62% was valued using quoted prices for similar assets in active or inactive markets, or other observable inputs, and 12% was valued using unobservable inputs that are supported by little or no market activity. As of December 31, 2023, 17% of the investment portfolio was valued at quoted prices in active markets for identical assets, 79% was valued using quoted prices for similar assets in active or inactive markets, or other observable inputs, and 4% was valued using unobservable inputs that are supported by little or no market activity, the majority of which used the net asset value per share (or its equivalent) as a practical expedient to measure the fair value. The fair values of our Pension Plan assets and certain other postretirement benefit plan assets in aggregate were $626 million and $1.3 billion as of December 31, 2024 and 2023, respectively. Our accumulated benefit obligations in aggregate were $895 million and $1.6 billion as of December 31, 2024 and 2023, respectively. As a result, the plans were underfunded by approximately $269 million and $350 million as of December 31, 2024 and 2023, respectively, and were recorded in Other long-term liabilities on our Consolidated Balance Sheets. In determining our pension obligation for the years ended December 31, 2024 and 2023, we used a weighted-average discount rate of 6% and 5%, respectively. During the years ended December 31, 2024 and 2023, we made contributions of $52 million and $32 million, respectively, to the benefit plans. We expect to make contributions to the Plan of $66 million through the year ending December 31, 2025. Future benefits expected to be paid are approximately $51 million for the 12-month period ending December 31, 2025, $110 million in total for both of the 12-month periods ending December 31, 2026 and 2027, $119 million in total for both of the 12-month periods ending December 31, 2028 and 2029, and $320 million in total thereafter. Employee Retirement Savings Plan We sponsor retirement savings plans for the majority of our employees under Section 401(k) of the Internal Revenue Code and similar plans. The plans allow employees to contribute a portion of their pre-tax and post-tax income in accordance with specified guidelines. The plans provide that we match a percentage of employee contributions up to certain limits. Employer matching contributions were $159 million, $171 million and $175 million for the years ended December 31, 2024, 2023 and 2022, respectively.

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2024
Income Tax Disclosure [Abstract]
Income Taxes	Note 14 – Income Taxes Our sources of Income before income taxes were as follows: Year Ended December 31, (in millions) 2024 2023 2022 U.S. income $ 14,607 $ 10,943 $ 3,116 Foreign income 105 56 30 Income before income taxes $ 14,712 $ 10,999 $ 3,146 Income tax expense is summarized as follows: Year Ended December 31, (in millions) 2024 2023 2022 Current tax (expense) benefit Federal $ (57) $ (42) $ 22 State (179) (28) (64) Foreign (17) (12) (22) Total current tax expense (253) (82) (64) Deferred tax (expense) benefit Federal (2,743) (2,150) (628) State (348) (417) 77 Foreign (29) (33) 59 Total deferred tax expense (3,120) (2,600) (492) Total income tax expense $ (3,373) $ (2,682) $ (556) The reconciliation between the U.S. federal statutory income tax rate and our effective income tax rate is as follows: Year Ended December 31, 2024 2023 2022 Federal statutory income tax rate 21.0 % 21.0 % 21.0 % State taxes, net of federal benefit 3.3 4.2 4.5 Effect of law and rate changes 0.1 (0.1) (5.3) Change in valuation allowance (0.2) (0.2) (0.8) Foreign taxes 0.3 0.4 0.7 Permanent differences 0.3 (0.1) (0.2) Federal tax credits (1.1) (0.8) (2.4) Equity-based compensation (0.3) (0.4) (1.2) Non-deductible compensation (0.1) 0.5 1.2 Other, net (0.4) (0.1) 0.2 Effective income tax rate 22.9 % 24.4 % 17.7 % Significant components of deferred income tax assets and liabilities, tax effected, are as follows: (in millions) December 31, December 31, Deferred tax assets Loss carryforwards $ 3,844 $ 6,227 Lease liabilities 7,781 8,355 Reserves and accruals 958 1,177 Other 3,959 4,459 Deferred tax assets, gross 16,542 20,218 Valuation allowance (259) (306) Deferred tax assets, net 16,283 19,912 Deferred tax liabilities Spectrum licenses 19,527 19,006 Property and equipment 5,874 6,142 Lease right-of-use assets 6,508 7,043 Other 1,074 1,179 Total deferred tax liabilities 32,983 33,370 Net deferred tax liabilities $ 16,700 $ 13,458 Classified on the consolidated balance sheets as: Deferred tax liabilities $ 16,700 $ 13,458 As of December 31, 2024, we have tax effected federal net operating loss (“NOL”) carryforwards of $2.9 billion, state NOL carryforwards of $1.6 billion and foreign NOL carryforwards of $4 million, expiring through 2044. Federal and certain state NOLs of $2.8 billion generated in and after 2018 do not expire. As of December 31, 2024, our tax effected federal, state and foreign NOL carryforwards for financial reporting purposes were approximately $167 million, $701 million and $4 million, respectively, less than our NOL carryforwards for federal, state and foreign income tax purposes, due to unrecognized tax benefits of the same amount. The unrecognized tax benefit amounts exclude offsetting tax effects of $181 million in other jurisdictions. As of December 31, 2024, we have research and development, corporate alternative minimum tax and other general business credit carryforwards with a combined value of $582 million for federal income tax purposes, an immaterial amount of which begins to expire in 2039. As of December 31, 2024, 2023 and 2022, our valuation allowance was $259 million, $306 million and $375 million, respectively. The change from December 31, 2023 to December 31, 2024 primarily related to a reduction in the valuation allowance against federal and state deferred tax assets resulting from a change in expected utilization of accumulated capital losses. The change from December 31, 2022 to December 31, 2023 primarily related to a reduction in the valuation allowance against deferred tax assets in certain state jurisdictions resulting from expiration of the related state tax attributes. We file income tax returns in the U.S. federal jurisdiction and in various state and foreign jurisdictions. We are currently under examination by various states. Management does not believe the resolution of any of the audits will result in a material change to our financial condition, results of operations or cash flows. The IRS has concluded audits of certain of our federal tax returns, most recently the 2020 tax year; however, NOL and other carryforwards for certain prior periods remain open for examination. U.S. federal, state and foreign examination for years prior to 2005 are generally closed. A reconciliation of the beginning and ending amount of unrecognized tax benefits were as follows: Year Ended December 31, (in millions) 2024 2023 2022 Unrecognized tax benefits, beginning of year $ 1,477 $ 1,254 $ 1,217 Gross increases to tax positions in prior periods 140 19 31 Gross decreases to tax positions in prior periods (201) (39) (65) Gross increases to current period tax positions 132 256 77 Gross decreases due to settlements with taxing authorities (11) — (3) Gross decreases due to statute of limitations lapse (67) (13) (3) Unrecognized tax benefits, end of year $ 1,470 $ 1,477 $ 1,254 As of December 31, 2024, 2023 and 2022, we had $1.3 billion, $1.3 billion and $962 million, respectively, in unrecognized tax benefits that, if recognized, would affect our annual effective tax rate. Penalties and interest on income tax assessments are included in Selling, general and administrative and Interest expense, respectively, on our Consolidated Statements of Comprehensive Income. The accrued interest and penalties associated with unrecognized tax benefits are insignificant. It is possible that the amount of unrecognized tax benefits related to our uncertain tax positions may change within the next 12 months.

Stockholder Return Programs

Stockholder Return Programs	12 Months Ended
	Dec. 31, 2024
Equity [Abstract]
Stockholder Return Programs	Note 15 – Stockholder Return Programs 2022 Stock Repurchase Program On September 8, 2022, our Board of Directors authorized our 2022 Stock Repurchase Program for up to $14.0 billion of our common stock through September 30, 2023. During the nine months ended September 30, 2023, we repurchased 77,460,937 shares of our common stock at an average price per share of $141.57 for a total purchase price of $11.0 billion under the 2022 Stock Repurchase Program. All shares purchased during the nine months ended September 30, 2023, were purchased at market price. 2023-2024 Stockholder Return Program On September 6, 2023, our Board of Directors authorized our 2023-2024 Stockholder Return Program of up to $19.0 billion that ran from October 1, 2023, through December 31, 2024. The 2023-2024 Stockholder Return Program consisted of repurchases of shares of our common stock and the payment of cash dividends. On September 25, 2023, our Board of Directors declared a cash dividend of $0.65 per share on our issued and outstanding common stock, which was paid on December 15, 2023, to stockholders of record as of the close of business on December 1, 2023. On January 24, 2024, our Board of Directors declared a cash dividend of $0.65 per share on our issued and outstanding common stock, which was paid on March 14, 2024, to stockholders of record as of the close of business on March 1, 2024. On March 15, 2024, our Board of Directors declared a cash dividend of $0.65 per share on our issued and outstanding common stock, which was paid on June 13, 2024, to stockholders of record as of the close of business on May 31, 2024. On June 13, 2024, our Board of Directors declared a cash dividend of $0.65 per share on our issued and outstanding common stock, which was paid on September 12, 2024, to stockholders of record as of the close of business on August 30, 2024. On September 18, 2024, our Board of Directors declared a cash dividend of $0.88 per share on our issued and outstanding common stock, which was paid on December 12, 2024, to stockholders of record as of the close of business on November 27, 2024. During the years ended December 31, 2024 and 2023, we paid an aggregate of $3.3 billion and $747 million, respectively, in cash dividends to our stockholders, which was presented within Net cash used in financing activities on our Consolidated Statements of Cash Flows, of which during the years ended December 31, 2024 and 2023, $1.7 billion and $393 million, respectively, was paid to DT. During the years ended December 31, 2024 and 2023, we repurchased 59,376,922 shares of our common stock at an average price per share of $187.07 for a total purchase price of $11.1 billion and 15,464,107 shares of our common stock at an average price per share of $144.95 for a total purchase price of $2.2 billion, respectively, under the 2023-2024 Stockholder Return Program. All shares repurchased during the years ended December 31, 2024 and 2023, were purchased at market price. 2025 Stockholder Return Program On December 13, 2024, we announced that our Board of Directors authorized our 2025 Stockholder Return Program of up to $14.0 billion that will run through December 31, 2025. The 2025 Stockholder Return Program is expected to consist of additional repurchases of shares of our common stock and the payment of cash dividends. The amount available under the 2025 Stockholder Return Program for share repurchases will be reduced by the amount of any cash dividends declared and paid by us. Under the 2025 Stockholder Return Program, share repurchases can be made from time to time using a variety of methods, which may include open market purchases, Rule 10b5-1 plans, accelerated share repurchases, privately negotiated transactions or otherwise, all in accordance with the rules of the Securities and Exchange Commission and other applicable legal requirements. The specific timing and amount of any share repurchases, and the specific timing and amount of any dividend payments, under the 2025 Stockholder Return Program will depend on prevailing share prices, general economic and market conditions, Company performance, and other considerations. In addition, the specific timing and amount of any dividend payments are subject to being declared on future dates by the Board in its sole discretion. The 2025 Stockholder Return Program does not obligate the Company to acquire any particular amount of common stock or to declare and pay any particular amount of dividends, and the 2025 Stockholder Return Program may be suspended or discontinued at any time at the Company’s discretion. On November 21, 2024, our Board of Directors declared a cash dividend of $0.88 per share on our issued and outstanding common stock, which will be paid on March 13, 2025, to stockholders of record as of the close of business on February 28, 2025. As of December 31, 2024, $1.0 billion for dividends payable is presented within Other current liabilities on our Consolidated Balance Sheets, of which $518 million is payable to DT. During the year ended December 31, 2024, we did not repurchase any shares of our common stock under the 2025 Stockholder Return Program. As of December 31, 2024, we had up to $14.0 billion remaining under the 2025 Stockholder Return Program. Subsequent to December 31, 2024, from January 1, 2025, through January 24, 2025, we repurchased 2,855,113 shares of our common stock at an average price per share of $216.03 for a total purchase price of $617 million. As of January 24, 2025, we had up to $13.4 billion remaining under the 2025 Stockholder Return Program for repurchases of shares and quarterly dividends through December 31, 2025.

Earnings Per Share

Earnings Per Share	12 Months Ended
	Dec. 31, 2024
Earnings Per Share [Abstract]
Earnings Per Share	Note 16 – Earnings Per Share The computation of basic and diluted earnings per share was as follows: Year Ended December 31, (in millions, except shares and per share amounts) 2024 2023 2022 Net income $ 11,339 $ 8,317 $ 2,590 Weighted-average shares outstanding – basic 1,169,195,373 1,185,121,562 1,249,763,934 Effect of dilutive securities: Outstanding stock options, unvested stock awards and SoftBank contingent consideration (2) 4,018,525 15,164,702 5,612,835 Weighted-average shares outstanding – diluted 1,173,213,898 1,200,286,264 1,255,376,769 Earnings per share – basic $ 9.70 $ 7.02 $ 2.07 Earnings per share – diluted $ 9.66 $ 6.93 $ 2.06 Potentially dilutive securities: Outstanding stock options and unvested stock awards 25,652 148,537 16,616 SoftBank contingent consideration (1) — — 48,751,557 Ka’ena Acquisition contingent consideration (3) 750,162 — — (1) Represents the weighted-average number of shares (“SoftBank Specified Shares”) that were contingently issuable from the Merger date of April 1, 2020, pursuant to a letter agreement dated February 20, 2020, between T-Mobile, SoftBank and DT (the “Letter Agreement”). (2) During 2023, the SoftBank Specified Shares were issued and included in our calculations of basic and diluted weighted-average shares outstanding as further described below. (3) The weighted-average number of shares contingently issuable related to the Ka’ena Acquisition earnout consideration (“Ka’ena Contingent Shares”) are included in potentially dilutive securities based on the maximum number of shares contingently issuable for the earnout and the 20 trading day volume-weighted average price as of December 31, 2024. No Ka’ena Contingent Shares were outstanding during the year ended December 31, 2024, as the threshold specified performance indicators had not been achieved. As of December 31, 2024, 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 December 31, 2024 and 2023. Potentially dilutive securities were not included in the computation of diluted earnings per share if to do so would have been anti-dilutive. The SoftBank Specified Shares of 48,751,557 shares of T-Mobile common stock was determined to be contingent consideration for the Merger and was not dilutive until the defined volume-weighted average price per share was reached. The issuance of the SoftBank Specified Shares was contingent on the trailing 45-trading day volume-weighted average (“VWAP”) per share of T-Mobile common stock on the NASDAQ Global Select Market being equal to or greater than $150.00 (the “Threshold Price”), at any time during the period commencing on April 1, 2022, and ending on December 31, 2025 (the “Measurement Period”). In accordance with the terms of the Letter Agreement, the Threshold Price was subject to downward adjustment by the per share amount of any cash dividends or other cash distributions declared or paid on our common stock during the Measurement Period. As of the close of trading on December 22, 2023, the 45-trading day VWAP exceeded $149.35, the then-current Threshold Price, and the Company delivered the SoftBank Specified Shares to SoftBank in accordance with the Letter Agreement on December 28, 2023, by reissuing Company treasury shares. Upon reissuance of treasury shares, the Company recorded a reclassification from Treasury shares to Additional paid-in capital of $6.9 billion, calculated based on the cost of treasury shares reissued.

Leases

Leases	12 Months Ended
	Dec. 31, 2024
Leases [Abstract]
Leases	Note 17 – Leases Lessee We are a lessee for non-cancelable operating and financing leases for cell sites, switch sites, retail stores, network equipment and office facilities with contractual terms that generally extend through 2035. The majority of cell site leases have a non-cancelable term of five five three The components of lease expense were as follows: Year Ended December 31, (in millions) 2024 2023 2022 Operating lease expense $ 4,787 $ 4,987 $ 6,514 Financing lease expense: Amortization of right-of-use assets 787 684 733 Interest on lease liabilities 111 79 68 Total financing lease expense 898 763 801 Variable lease expense 279 411 484 Total lease expense $ 5,964 $ 6,161 $ 7,799 Information relating to the lease term and discount rate is as follows: Year Ended December 31, 2024 2023 2022 Weighted-Average Remaining Lease Term (Years) Operating leases 8 9 10 Financing leases 2 2 2 Weighted-Average Discount Rate Operating leases 4.4 % 4.3 % 4.1 % Financing leases 5.3 % 4.6 % 3.2 % Maturities of lease liabilities as of December 31, 2024, were as follows: (in millions) Operating Leases Finance Leases Twelve Months Ending December 31, 2025 $ 4,491 $ 1,242 2026 4,400 809 2027 4,093 357 2028 3,763 25 2029 3,478 4 Thereafter 15,664 — Total lease payments 35,889 2,437 Less: imputed interest 6,199 111 Total $ 29,690 $ 2,326 Interest payments for financing leases were $111 million, $79 million and $68 million for the years ended December 31, 2024, 2023 and 2022, respectively. As of December 31, 2024, we have additional operating leases for commercial properties that have not yet commenced with future lease payments of approximately $24 million. As of December 31, 2024, we were contingently liable for future ground lease payments related to certain tower obligations. These contingent obligations are not included in the above table as the amounts owed are contractually owed by CCI based on the subleasing arrangement. See Note 10 – Tower Obligations for further information.
Leases	Note 17 – Leases Lessee We are a lessee for non-cancelable operating and financing leases for cell sites, switch sites, retail stores, network equipment and office facilities with contractual terms that generally extend through 2035. The majority of cell site leases have a non-cancelable term of five five three The components of lease expense were as follows: Year Ended December 31, (in millions) 2024 2023 2022 Operating lease expense $ 4,787 $ 4,987 $ 6,514 Financing lease expense: Amortization of right-of-use assets 787 684 733 Interest on lease liabilities 111 79 68 Total financing lease expense 898 763 801 Variable lease expense 279 411 484 Total lease expense $ 5,964 $ 6,161 $ 7,799 Information relating to the lease term and discount rate is as follows: Year Ended December 31, 2024 2023 2022 Weighted-Average Remaining Lease Term (Years) Operating leases 8 9 10 Financing leases 2 2 2 Weighted-Average Discount Rate Operating leases 4.4 % 4.3 % 4.1 % Financing leases 5.3 % 4.6 % 3.2 % Maturities of lease liabilities as of December 31, 2024, were as follows: (in millions) Operating Leases Finance Leases Twelve Months Ending December 31, 2025 $ 4,491 $ 1,242 2026 4,400 809 2027 4,093 357 2028 3,763 25 2029 3,478 4 Thereafter 15,664 — Total lease payments 35,889 2,437 Less: imputed interest 6,199 111 Total $ 29,690 $ 2,326 Interest payments for financing leases were $111 million, $79 million and $68 million for the years ended December 31, 2024, 2023 and 2022, respectively. As of December 31, 2024, we have additional operating leases for commercial properties that have not yet commenced with future lease payments of approximately $24 million. As of December 31, 2024, we were contingently liable for future ground lease payments related to certain tower obligations. These contingent obligations are not included in the above table as the amounts owed are contractually owed by CCI based on the subleasing arrangement. See Note 10 – Tower Obligations for further information.

Commitments and Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2024
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Note 18 – Commitments and Contingencies Purchase Commitments We have commitments for non-dedicated transportation lines with varying expiration terms that generally extend through 2038. In addition, we have commitments to purchase wireless devices, network services, equipment, software, marketing sponsorship agreements and other items in the ordinary course of business, with various terms through 2043. Such purchase commitments are approximately $4.6 billion for the 12-month period ending December 31, 2025, $5.1 billion in total for both of the 12-month periods ending December 31, 2026 and 2027, $2.2 billion in total for both of the 12-month periods ending December 31, 2028 and 2029, and $2.3 billion in total thereafter. These amounts are not reflective of our entire anticipated purchases under the related agreements but are determined based on the non-cancelable quantities or termination amounts to which we are contractually obligated. On April 24, 2024, we entered into a definitive agreement with a fund operated by EQT, Fund VI, to establish a joint venture between us and Fund VI to acquire Lumos, a fiber-to-the-home platform, from EQT’s predecessor fund, EQT Infrastructure III. At closing, we expect to invest approximately $950 million in the joint venture to acquire a 50% equity interest and all existing Lumos fiber customers. The funds invested by us will be used by the joint venture to fund future fiber builds. In addition, pursuant to the definitive agreement, we expect to make an additional capital contribution of approximately $500 million in 2027 or 2028 under the existing business plan. The agreement remains subject to regulatory approval, and the estimated purchase price is excluded from our reported purchase commitments above. See Note 3 – Joint Ventures for additional details. On May 24, 2024, we entered into a securities purchase agreement with UScellular, Telephone and Data Systems, Inc., and USCC Wireless Holdings, LLC, pursuant to which, among other things, we will acquire substantially all of UScellular’s wireless operations and select 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 an exchange offer to be made to certain UScellular debtholders prior to closing. To the extent any debtholders do not participate in the exchange, their bonds will continue as obligations of UScellular, and the cash portion of the purchase price will be correspondingly increased. Following the closing of the transaction, we will enter into a 15-year master license agreement and estimate the incremental future minimum lease payments will be $1.4 billion over 15 years post-closing. The securities purchase agreement remains subject to regulatory approval. The estimated purchase price and incremental minimum lease payments are excluded from our reported purchase commitments above. See Note 2 – Business Combinations for additional details. On July 18, 2024, we entered into a definitive agreement with KKR to establish a joint venture to acquire Metronet, a fiber-to-the-home platform. At closing, we expect to invest approximately $4.9 billion in the joint venture to acquire a 50% equity interest and all existing residential fiber customers, as well as funding the joint venture. The agreement remains subject to regulatory approval, and the estimated purchase price is excluded from our reported purchase commitments above. See Note 3 – Joint Ventures for additional details. 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., for a purchase price of approximately $625 million. The agreement remains subject to certain regulatory approvals, and the estimated purchase price is excluded from our reported purchase commitments above. See Note 2 – Business Combinations for additional details. Spectrum We lease spectrum from various parties. These leases include service obligations to the lessors. Certain spectrum leases provide for minimum lease payments, additional charges, renewal options and escalation clauses. Leased spectrum agreements have varying expiration terms that generally extend through 2050. We expect that all renewal periods in our spectrum leases will be exercised by us. Certain spectrum leases also include purchase options and right-of-first refusal clauses in which we are provided the opportunity to exercise our purchase option if the lessor receives a purchase offer from a third party. The purchase of the leased spectrum is at our option and, therefore, the option price is not included in the commitments below. Our spectrum lease and service credit commitments, including renewal periods, are approximately $289 million for the 12-month period ending December 31, 2025, $613 million in total for both of the 12-month periods ending December 31, 2026 and 2027, $641 million in total for both of the 12-month periods ending December 31, 2028 and 2029, and $3.8 billion in total thereafter. On August 8, 2022, we entered into License Purchase Agreements to acquire spectrum in the 600 MHz band from Channel 51 License Co LLC and LB License Co, LLC in exchange for total cash consideration of $3.5 billion. The first tranche closed on June 24, 2024, and the associated payment of $2.4 billion was made on August 5, 2024. The purchase of the Dallas licenses closed on December 6, 2024, and the associated payment of $541 million was made on the same day. The remaining deferred licenses from the second tranche of $604 million remain subject to regulatory approval and are excluded from our reported purchase commitments above. See Note 7 – Goodwill, Spectrum License Transactions and Other Intangible Assets for additional details. On September 12, 2023, we entered into a License Purchase Agreement with Comcast pursuant to which we will acquire spectrum in the 600 MHz band from Comcast in exchange for total cash consideration of between $1.2 billion and $3.3 billion, subject to an application for FCC approval. The licenses are subject to an exclusive leasing arrangement between us and Comcast entered into contemporaneously with the License Purchase Agreement. On January 13, 2025, we and Comcast entered into an amendment to the 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. The agreement remains subject to an application for FCC approval and is excluded from our reported purchase commitments above. See Note 7 – Goodwill, Spectrum License Transactions and Other Intangible Assets for additional details. Merger Commitments In connection with the regulatory proceedings and approvals of the 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 (collectively, the “Transactions”), 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 and 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 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, and the marketing of an in-home broadband product where spectrum capacity is available. Other commitments relate to national security, pricing, service, employment and support of diversity initiatives. 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 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 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. We are unable to predict the potential outcome of those proceedings. On April 1, 2020, in connection with the closing of the Merger, we assumed the contingencies and litigation matters of Sprint. Those matters include a wide variety of disputes, claims, government agency investigations and enforcement actions, and other proceedings. These matters include, among other things, certain ongoing FCC and state government agency investigations into Sprint’s Lifeline program. In September 2019, Sprint notified the FCC that it had claimed monthly subsidies for serving subscribers, even though these subscribers may not have met usage requirements under Sprint's usage policy for the Lifeline program, due to an inadvertent coding issue in the system used to identify qualifying subscriber usage that occurred in July 2017 while the system was being updated. Sprint has made a number of payments to reimburse the federal government and certain states for excess subsidy payments. We note that, pursuant to Amendment No. 2, dated as of February 20, 2020, to the Business Combination Agreement, dated as of April 29, 2018, by and among the Company, Sprint and the other parties named therein, SoftBank agreed to indemnify us against certain specified matters and losses, including those relating to the Lifeline matters described above. Resolution of these matters could require us to make additional reimbursements and pay additional fines and penalties, which we do not expect to have a significant impact on our financial results. We expect that any additional liabilities related to these indemnified matters would be indemnified and reimbursed by SoftBank. 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”). We immediately began an investigation and engaged cybersecurity experts to assist with the assessment of the incident and to help determine what data was impacted. 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. With the assistance of our outside cybersecurity experts, we located and closed the unauthorized access to our systems and identified current, former and prospective customers whose information was impacted and notified them, consistent with state and federal requirements. We also undertook a number of other measures to demonstrate our continued support and commitment to data privacy and protection. We also coordinated with law enforcement. Our forensic investigation is complete, and we believe we have a full view of the data compromised. 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 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. During the years ended December 31, 2024, 2023 and 2022, we recognized $105 million, $50 million and $100 million, respectively, in reimbursements from insurance carriers for costs incurred related to the August 2021 cyberattack, which is included as a reduction to Selling, general and administrative expenses on our Consolidated Statements of Comprehensive Income. In addition, in September 2022, a purported Company shareholder filed a derivative action in the Delaware Court of Chancery under the caption Harper v. Sievert et al., Case No. 2022-0819-SG, against our current directors and certain of our former directors, alleging claims for breach of fiduciary duty relating to the Company’s cybersecurity practices. We are also named as a nominal defendant in the lawsuit. On May 31, 2024, the court issued an opinion dismissing the plaintiff’s complaint in its entirety. The plaintiff has appealed that decision. We are unable at this time to predict the potential outcome of this lawsuit or whether we may be subject to further private litigation. 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 cooperate fully with 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 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 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 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, to which we will continue to respond in due course and may incur significant expenses. However, 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. In addition, we are unable to predict the full impact of this incident on customer behavior in the future, including whether a change in our customers’ behavior could negatively impact our results of operations on an ongoing basis, although we presently do not expect that it will have a material effect on our operations.

Restructuring Costs

Restructuring Costs	12 Months Ended
	Dec. 31, 2024
Restructuring and Related Activities [Abstract]
Restructuring Costs	Note 19 – Restructuring Costs Merger Restructuring Initiatives Upon closing the Merger in April 2020, we began implementing restructuring initiatives to realize cost efficiencies and reduce redundancies. The major activities associated with the Merger restructuring initiatives included 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 small cell sites and distributed antenna systems to achieve Merger synergies in network costs. As of June 30, 2024, we have incurred substantially all restructuring and integration costs associated with the Merger and, accordingly, no longer separately disclose Merger-related costs. The cash payments for the Merger-related costs incurred extend beyond 2024. The following table summarizes the expenses incurred in connection with our Merger restructuring initiatives: (in millions) Year Ended Year Ended Year Ended Incurred to Date Contract termination costs $ 231 $ 45 $ 4 $ 472 Severance costs 169 3 — 574 Network decommissioning 796 289 91 1,857 Total restructuring plan expenses $ 1,196 $ 337 $ 95 $ 2,903 The expenses associated with our Merger restructuring initiatives are included in Cost of services and Selling, general and administrative expenses on our Consolidated Statements of Comprehensive Income. Our Merger restructuring initiatives also included the acceleration or termination of certain of our operating and financing leases for cell sites, switch sites, retail stores, network equipment and office facilities. Incremental expenses associated with terminated leases and leases for which we have recognized accelerated lease expense were $91 million, $390 million and $1.7 billion for the years ended December 31, 2024, 2023 and 2022, respectively, and are included in Cost of services and Selling, general and administrative expenses on our Consolidated Statements of Comprehensive Income. 2023 Workforce Reduction In August 2023, we implemented an initiative to reduce the size of our workforce by approximately 5,000 positions, just under 7% of our total employee base, primarily in corporate and back-office functions, and some technology roles. The following table summarizes the expenses incurred in connection with our workforce reduction initiative: (in millions) Year Ended Year Ended Incurred to Date Severance costs (recoveries) $ 462 $ (5) $ 457 The expenses associated with our workforce reduction initiative are included in Cost of services and Selling, general and administrative expenses on our Consolidated Statements of Comprehensive Income.

Additional Financial Informatio

Additional Financial Information	12 Months Ended
	Dec. 31, 2024
Supplemental Financial Statement Elements [Abstract]
Additional Financial Information	Note 20 – Additional Financial Information Accounts Payable and Accrued Liabilities Accounts payable and accrued liabilities are summarized as follows: (in millions) December 31, December 31, Accounts payable $ 4,242 $ 5,573 Payroll and related benefits 1,072 1,142 Property and other taxes, including payroll 1,524 1,704 Accrued interest 905 818 Other accrued liabilities 720 1,136 Accounts payable and accrued liabilities $ 8,463 $ 10,373 Book overdrafts included in accounts payable were $460 million and $740 million as of December 31, 2024 and 2023, respectively. Related Party Transactions We have related party transactions associated with DT, SoftBank or their respective affiliates in the ordinary course of business, including intercompany servicing and licensing. The following table summarizes the impact of significant transactions with DT or its affiliates included in Operating expenses in the Consolidated Statements of Comprehensive Income: Year Ended December 31, (in millions) 2024 2023 2022 Fees incurred for use of the T-Mobile brand $ 80 $ 80 $ 80 International long distance agreement 19 20 25 We have an agreement with DT for the reimbursement of certain administrative expenses, which was $4 million for each of the years ended December 31, 2024, 2023 and 2022. During the years ended December 31, 2024 and 2023, we paid an aggregate of $3.3 billion and $747 million in cash dividends to our stockholders, of which $1.7 billion and $393 million was paid to DT, respectively. See Note 1 5 - Stockholder Return Programs for further information. Supplemental Consolidated Statements of Cash Flows Information The following table summarizes T-Mobile’s supplemental cash flow information: Year Ended December 31, (in millions) 2024 2023 2022 Interest payments, net of amounts capitalized $ 3,683 $ 3,546 $ 3,485 Operating lease payments 5,162 5,062 4,205 Income tax payments 211 149 76 Non-cash investing and financing activities Non-cash beneficial interest obtained in exchange for securitized receivables $ 2,421 $ 3,990 $ 4,192 Change in accounts payable and accrued liabilities for purchases of property and equipment 105 (860) 133 Increase in Tower obligations from contract modification — — 1,158 Operating lease right-of-use assets obtained in exchange for lease obligations 1,741 2,141 7,462 Financing lease right-of-use assets obtained in exchange for lease obligations 1,222 1,224 1,256 Contingent and other deferred consideration related to the Ka’ena Acquisition 218 — — Cash and Cash Equivalents, Including Restricted Cash Cash and cash equivalents, including restricted cash, presented on our Consolidated Statements of Cash Flows were included on our Consolidated Balance Sheets as follows: (in millions) December 31, December 31, Cash and cash equivalents $ 5,409 $ 5,135 Restricted cash (included in Other current assets) 231 101 Restricted cash (included in Other assets) 73 71 Cash and cash equivalents, including restricted cash $ 5,713 $ 5,307

Subsequent Events

Subsequent Events	12 Months Ended
	Dec. 31, 2024
Subsequent Events [Abstract]
Subsequent Events	Note 21 – Subsequent Events Subsequent to December 31, 2024, from January 1, 2025, through January 24, 2025, we repurchased 2,855,113 shares of our common stock at an average price per share of $216.03 for a total purchase price of $617 million. See Note 15 - Stockholder Return Programs for additional information. Subsequent to December 31, 2024, on January 31, 2025, our wholly owned subsidiary, T-Mobile USA, Inc., entered into the ECA Facility, providing for a loan of up to $1.0 billion to finance network equipment-related purchases. The obligations under the ECA Facility are also guaranteed by us and by all of our wholly owned domestic restricted subsidiaries (subject to customary exceptions). Any borrowing under the ECA Facility will mature on March 15, 2036. As of January 31, 2025, the ECA Facility is undrawn.

Pay vs Performance Disclosure

Pay vs Performance Disclosure - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Pay vs Performance Disclosure
Net income	$ 11,339	$ 8,317	$ 2,590

Insider Trading Arrangements

Insider Trading Arrangements	3 Months Ended	12 Months Ended
	Dec. 31, 2024 shares	Dec. 31, 2024 shares
Trading Arrangements, by Individual
Non-Rule 10b5-1 Arrangement Adopted	false
Rule 10b5-1 Arrangement Terminated	false
Non-Rule 10b5-1 Arrangement Terminated	false
Michael Katz [Member]
Trading Arrangements, by Individual
Material Terms of Trading Arrangement		On November 6, 2024, Michael Katz, President, Marketing, Strategy and Products, adopted a trading plan intended to satisfy the affirmative defense of Rule 10b5-1(c) to sell up to 2,500 shares of the Company’s common stock between May 15, 2025, and December 31, 2025, and up to 6,204 shares of the Company’s common stock to be acquired on February 15, 2025, upon the vesting of certain time-based restricted stock unit awards, between February 18, 2025, and December 31, 2025, subject to certain conditions. The duration of this trading plan is 420 days.
Name	Michael Katz
Title	President, Marketing, Strategy and Products
Rule 10b5-1 Arrangement Adopted	true
Adoption Date	November 6, 2024
Expiration Date	December 31, 2025
Arrangement Duration	420 days
Callie Field [Member]
Trading Arrangements, by Individual
Material Terms of Trading Arrangement		On November 12, 2024, Callie Field, President, Business Group, adopted a trading plan intended to satisfy the affirmative defense of Rule 10b5-1(c) to sell on February 18, 2025, all of her T-Mobile US, Inc. common stock to be acquired on February 15, 2025, upon the vesting of certain time-based restricted stock unit awards and performance-based restricted stock unit awards (“PRSUs”), up to a total of 43,582 shares assuming PRSUs will vest at maximum value, subject to certain conditions. The duration of this trading plan is 99 days.
Name	Callie Field
Title	President, Business Group
Rule 10b5-1 Arrangement Adopted	true
Adoption Date	November 12, 2024
Expiration Date	February 18, 2025
Arrangement Duration	99 days
Aggregate Available	43,582	43,582
G. Michael Sievert [Member]
Trading Arrangements, by Individual
Material Terms of Trading Arrangement		On November 14, 2024, G. Michael Sievert, President and Chief Executive Officer, adopted a trading plan intended to satisfy the affirmative defense of Rule 10b5-1(c) to sell up to 180,000 shares of T-Mobile US, Inc. common stock between February 25, 2025, and November 18, 2025, subject to certain conditions. The duration of this trading plan is 370 days.
Name	G. Michael Sievert
Title	President and Chief Executive Officer
Rule 10b5-1 Arrangement Adopted	true
Adoption Date	November 14, 2024
Expiration Date	November 18, 2025
Arrangement Duration	370 days
Aggregate Available	180,000	180,000
Ulf Ewaldsson [Member]
Trading Arrangements, by Individual
Material Terms of Trading Arrangement		On November 25, 2024, Ulf Ewaldsson, the Company’s President, Technology, adopted a trading plan intended to satisfy the affirmative defense of Rule 10b5-1(c) to sell up to 19,407 shares of the Company’s common stock on February 21, 2025, subject to certain conditions. The duration of this trading plan is 89 days.
Name	Ulf Ewaldsson
Title	President, Technology
Rule 10b5-1 Arrangement Adopted	true
Adoption Date	November 25, 2024
Expiration Date	February 21, 2025
Arrangement Duration	89 days
Aggregate Available	19,407	19,407
Peter Osvaldik [Member]
Trading Arrangements, by Individual
Material Terms of Trading Arrangement		On November 26, 2024, Peter Osvaldik, the Company’s Chief Financial Officer, adopted a trading plan intended to satisfy the affirmative defense of Rule 10b5-1(c) to sell up to 25,000 shares of the Company’s common stock between February 27, 2025, and November 28, 2025, subject to certain conditions. The duration of this trading plan is 367 days.
Name	Peter Osvaldik
Title	Chief Financial Officer
Rule 10b5-1 Arrangement Adopted	true
Adoption Date	November 26, 2024
Expiration Date	November 28, 2025
Arrangement Duration	367 days
Aggregate Available	25,000	25,000
Raul Marcelo Claure [Member]
Trading Arrangements, by Individual
Material Terms of Trading Arrangement		On December 13, 2024, Raul Marcelo Claure, a member of the Company’s Board of Directors, adopted a trading plan intended to satisfy the affirmative defense of Rule 10b5-1(c) to sell up to 620,400 shares of the Company’s common stock between April 12, 2025, and December 31, 2025, subject to certain conditions. The duration of this trading plan is 383 days.
Name	Raul Marcelo Claure
Title	Director
Rule 10b5-1 Arrangement Adopted	true
Adoption Date	December 13, 2024
Expiration Date	December 31, 2025
Arrangement Duration	383 days
Aggregate Available	620,400	620,400
Michael Katz Trading Arrangement, Common Stock [Member] | Michael Katz [Member]
Trading Arrangements, by Individual
Aggregate Available	2,500	2,500
Michael Katz Trading Arrangement, Time-Based Restricted Stock Unit Awards [Member] | Michael Katz [Member]
Trading Arrangements, by Individual
Aggregate Available	6,204	6,204

Insider Trading Policies and Pr

Insider Trading Policies and Procedures	12 Months Ended
	Dec. 31, 2024
Insider Trading Policies and Procedures [Line Items]
Insider Trading Policies and Procedures Adopted	true

Cybersecurity Risk Management a

Cybersecurity Risk Management and Strategy Disclosure	12 Months Ended
	Dec. 31, 2024
Cybersecurity Risk Management, Strategy, and Governance [Line Items]
Cybersecurity Risk Management Processes for Assessing, Identifying, and Managing Threats [Text Block]	Our Cybersecurity Approach and Integration We have implemented processes for overseeing and identifying material risks from cybersecurity threats, and our cybersecurity processes are integrated into the Company’s overall risk management system and processes. As part of management’s oversight of cybersecurity, our Chief Security Officer (“CSO”) presents on our cybersecurity practices to the Nominating and Corporate Governance Committee of our Board of Directors (the “NCG Committee”) and to our full Board of Directors on a periodic basis. Our Senior Vice President, Internal Audit & Risk Management (the “Chief Audit Executive”), periodically presents enterprise risks, including cybersecurity risks, to the Audit Committee of our Board of Directors (the “Audit Committee”). Our Chief Compliance Officer regularly attends meetings of the NCG Committee to provide insights from the compliance perspective relating to cybersecurity. Cyber risk management is a core component of the Company's governance structure. We utilize the National Institute of Standards and Technology’s Cybersecurity Framework as a guide in cyber risk management to identify, assess, and assist the CSO in managing cybersecurity risks. Cyber risk management encompasses partnerships among teams that are responsible for cyber governance, prevention, detection, and remediation activities within the Company’s cybersecurity environment. As part of our cyber risk management efforts, we conduct periodic reviews and collaborate with enterprise-wide risk assessments to assess and manage cybersecurity risks. Our cybersecurity team also provides enterprise-wide cybersecurity training for employees to continuously improve our mitigation against human-driven vulnerabilities. Our management also conducts a quarterly enterprise-wide risk assessment that considers a wide spectrum of risks facing the Company, including cybersecurity. Through these quarterly risk assessments, management informs the Audit Committee on the cyber risk landscape facing the Company and the Company’s preparedness to manage such risk. The enterprise-wide risk assessment is a top-down risk assessment that leverages the assessments performed by cyber risk management. Engagement with External Experts The Company engages top-tier external cyber security firms, as needed, leveraging their expertise as part of our ongoing effort to evaluate and enhance our cybersecurity program. They help with cyber defense capabilities (including staff enhancement of certain functions) and transformation to mitigate associated threats, reduce risk, enhance our cybersecurity posture, and meet the Company's evolving needs. Oversight of Third-Party Service Providers Our third-party risk management program includes processes for identifying and managing material cybersecurity risks arising from third-party providers. Our third-party risk management program actively engages with the enterprise-wide risk assessment process and partners with cyber risk management to report relevant risks to the NCG Committee, the Audit Committee and our internal Enterprise Risk & Compliance Committee. Our third-party risk management program includes cybersecurity as an aspect of its risk assessment of third parties with the objective that key risks are identified and addressed. Moreover, the program also considers risks associated with certain fourth parties, entities that are partners or subcontractors of our direct third-party vendors, through assessments carried out by our third-party service providers. Cybersecurity Incident Impact As previously disclosed, in August 2021, we experienced a cybersecurity incident that resulted in numerous lawsuits, including mass arbitration claims and multiple class action lawsuits. In January 2023, we experienced another cybersecurity incident that also resulted in consumer class actions and regulatory inquiries. As a result of the August 2021 cyberattack and the January 2023 cyberattack, we have incurred and may continue to incur significant costs or experience other material financial impacts, which may not be covered by, or may exceed the coverage limits of, our cyber liability insurance, and such costs and impacts may have a material adverse effect on our business, reputation, financial condition, cash flows and operating results. For additional details regarding the impact of both cybersecurity incidents, see Note 1 8 – Commitments and Contingencies of the Notes to the Consolidated Financial Statements. We have not identified other known risks from previous cybersecurity threats that have materially affected or are reasonably likely to materially affect us. However, we face ongoing risks from certain cybersecurity threats that, if realized, are reasonably likely to materially affect business strategy, results of operations, or financial condition. See “Risk Factors – We have experienced criminal cyberattacks and could in the future be further harmed by disruption, data loss or other security breaches, whether directly or indirectly through third parties whose products and services we rely on in operating our business .”
Cybersecurity Risk Management Processes Integrated [Flag]	true
Cybersecurity Risk Management Processes Integrated [Text Block]	We have implemented processes for overseeing and identifying material risks from cybersecurity threats, and our cybersecurity processes are integrated into the Company’s overall risk management system and processes.
Cybersecurity Risk Management Third Party Engaged [Flag]	true
Cybersecurity Risk Third Party Oversight and Identification Processes [Flag]	true
Cybersecurity Risk Materially Affected or Reasonably Likely to Materially Affect Registrant [Flag]	false
Cybersecurity Risk Materially Affected or Reasonably Likely to Materially Affect Registrant [Text Block]	As previously disclosed, in August 2021, we experienced a cybersecurity incident that resulted in numerous lawsuits, including mass arbitration claims and multiple class action lawsuits. In January 2023, we experienced another cybersecurity incident that also resulted in consumer class actions and regulatory inquiries. As a result of the August 2021 cyberattack and the January 2023 cyberattack, we have incurred and may continue to incur significant costs or experience other material financial impacts, which may not be covered by, or may exceed the coverage limits of, our cyber liability insurance, and such costs and impacts may have a material adverse effect on our business, reputation, financial condition, cash flows and operating results.
Cybersecurity Risk Board of Directors Oversight [Text Block]	Disclosure of Management’s Responsibilities Transformation and Chief Information & Digital Officer The Transformation and Chief Information & Digital Officer under the direction of the Company’s Chief Executive Officer, is responsible for overseeing the Company’s information technology systems, digital capabilities, and cybersecurity practices. The CSO, under the direction of the Transformation and Chief Information & Digital Officer, is responsible for overseeing the cybersecurity organization and promoting a security-centric culture throughout our business and operational functions. The CSO is at the forefront of enhancing our cybersecurity framework and strengthening the overall cybersecurity program. This involves upgrading tools and capabilities, which are part of a broader, multi-year strategy to continue to enhance security measures. The CSO oversees the cyber risk management function, which identifies cybersecurity threats, assesses cybersecurity risks and supports the Transformation and Chief Information & Digital Officer and the Company in managing such risks. As the Company’s Executive Vice President, Transformation and Chief Information & Digital Officer, Néstor Cano has served in several leadership positions at both the Company and Sprint, including as Sprint’s Chief Operating Officer, overseeing, among other things, Sprint’s digital architecture and delivery. Mr. Cano studied industrial engineering at Barcelona Polytechnic University, attended the Executive Distribution Academy by INSEAD Business School in Fontainebleau, France, and also completed his post-graduate degree in executive management at IESE Business School in Barcelona, Spain. As the Company’s CSO, Jeff Simon has extensive experience in risk management and information security, including serving as the Chief Information Security Officer at Fidelity National Information Services, Inc. Mr. Simon received his Master of Science in Computer Science, Software Engineering & Artificial Intelligence from the Johns Hopkins Whiting School of Engineering and Bachelor of Science in Business Administration and Applied Economics from Marquette University. Mr. Simon is a Certified Information Systems Security Professional. Enterprise Risk & Compliance Committee Our Enterprise Risk & Compliance Committee is comprised of a collective of senior management representatives and subject matter experts from across the Company. The Enterprise Risk & Compliance Committee is chaired by the Chief Financial Officer of the Company, with the Executive Vice President & General Counsel as the co-chair and comprises core members including the Transformation and Chief Information & Digital Officer, while the CSO serves in an advisory capacity. The purpose of the Enterprise Risk & Compliance Committee is to oversee and govern the Company’s risk management, environmental, social, corporate governance, cybersecurity, and operational compliance activities, as well as provide a means of bringing risk issues to the attention of management. Specific to cybersecurity, the Transformation and Chief Information & Digital Officer and the CSO have the expertise to provide insights into the nature of cyber threats, the Company’s readiness, and actions taken to mitigate such risks. Disclosure of the Board’s Roles and Responsibilities Our Board of Directors oversees risks from cybersecurity threats using a multi-faceted approach that involves the NCG Committee and Audit Committee and various executive roles. Additionally, our Transformation and Chief Information & Digital Officer and CSO report on cybersecurity to the full Board. Nominating and Corporate Governance Committee The NCG Committee oversees risks associated with data privacy and information security, which encompasses cybersecurity. Our CSO and Chief Compliance Officer, among other executives, provide periodic reports to the NCG Committee and also meet with the NCG Committee to discuss any material events when they arise. The periodic reports are designed to keep the NCG Committee abreast of the Company’s cybersecurity practices, risks and trends in cybersecurity threats. The NCG Committee also has discussions with management focused on evaluating the Company’s exposure to cybersecurity risks and cybersecurity practices in place to mitigate such risks. These discussions enable the NCG Committee to be informed of the steps management is taking to detect, monitor and manage cybersecurity risks. These reports to the NCG Committee typically include information on any significant incidents that have occurred, how they were managed, and any changes to the risk profile of the Company. The NCG Committee seeks updates to facilitate proactive governance and to allow the NCG Committee to address emerging cybersecurity issues with management. Audit Committee The Audit Committee is integral to overseeing the Company’s overall risk management strategies, including cybersecurity risks and disclosures. To keep the Audit Committee informed, the Chief Audit Executive maintains a direct and open communication channel with the Audit Committee. Regular meetings are held for the Chief Audit Executive to report to the Audit Committee. These include an enterprise-wide risk assessment that highlights cybersecurity risks and cybersecurity risk mitigation actions. Additionally, the Audit Committee receives updates on significant incidents and cybersecurity risks that have been presented to or discussed with the Enterprise Risk & Compliance Committee.
Cybersecurity Risk Board Committee or Subcommittee Responsible for Oversight [Text Block]	The Audit Committee is integral to overseeing the Company’s overall risk management strategies, including cybersecurity risks and disclosures.
Cybersecurity Risk Process for Informing Board Committee or Subcommittee Responsible for Oversight [Text Block]	As part of management’s oversight of cybersecurity, our Chief Security Officer (“CSO”) presents on our cybersecurity practices to the Nominating and Corporate Governance Committee of our Board of Directors (the “NCG Committee”) and to our full Board of Directors on a periodic basis. Our Senior Vice President, Internal Audit & Risk Management (the “Chief Audit Executive”), periodically presents enterprise risks, including cybersecurity risks, to the Audit Committee of our Board of Directors (the “Audit Committee”). Our Chief Compliance Officer regularly attends meetings of the NCG Committee to provide insights from the compliance perspective relating to cybersecurity.
Cybersecurity Risk Role of Management [Text Block]	Disclosure of the Board’s Roles and Responsibilities Our Board of Directors oversees risks from cybersecurity threats using a multi-faceted approach that involves the NCG Committee and Audit Committee and various executive roles. Additionally, our Transformation and Chief Information & Digital Officer and CSO report on cybersecurity to the full Board.
Cybersecurity Risk Management Positions or Committees Responsible [Flag]	true
Cybersecurity Risk Management Positions or Committees Responsible [Text Block]	The CSO, under the direction of the Transformation and Chief Information & Digital Officer, is responsible for overseeing the cybersecurity organization and promoting a security-centric culture throughout our business and operational functions.
Cybersecurity Risk Management Expertise of Management Responsible [Text Block]	As the Company’s Executive Vice President, Transformation and Chief Information & Digital Officer, Néstor Cano has served in several leadership positions at both the Company and Sprint, including as Sprint’s Chief Operating Officer, overseeing, among other things, Sprint’s digital architecture and delivery. Mr. Cano studied industrial engineering at Barcelona Polytechnic University, attended the Executive Distribution Academy by INSEAD Business School in Fontainebleau, France, and also completed his post-graduate degree in executive management at IESE Business School in Barcelona, Spain. As the Company’s CSO, Jeff Simon has extensive experience in risk management and information security, including serving as the Chief Information Security Officer at Fidelity National Information Services, Inc. Mr. Simon received his Master of Science in Computer Science, Software Engineering & Artificial Intelligence from the Johns Hopkins Whiting School of Engineering and Bachelor of Science in Business Administration and Applied Economics from Marquette University. Mr. Simon is a Certified Information Systems Security Professional.
Cybersecurity Risk Process for Informing Management or Committees Responsible [Text Block]	Nominating and Corporate Governance Committee The NCG Committee oversees risks associated with data privacy and information security, which encompasses cybersecurity. Our CSO and Chief Compliance Officer, among other executives, provide periodic reports to the NCG Committee and also meet with the NCG Committee to discuss any material events when they arise. The periodic reports are designed to keep the NCG Committee abreast of the Company’s cybersecurity practices, risks and trends in cybersecurity threats. The NCG Committee also has discussions with management focused on evaluating the Company’s exposure to cybersecurity risks and cybersecurity practices in place to mitigate such risks. These discussions enable the NCG Committee to be informed of the steps management is taking to detect, monitor and manage cybersecurity risks. These reports to the NCG Committee typically include information on any significant incidents that have occurred, how they were managed, and any changes to the risk profile of the Company. The NCG Committee seeks updates to facilitate proactive governance and to allow the NCG Committee to address emerging cybersecurity issues with management. Audit Committee The Audit Committee is integral to overseeing the Company’s overall risk management strategies, including cybersecurity risks and disclosures. To keep the Audit Committee informed, the Chief Audit Executive maintains a direct and open communication channel with the Audit Committee. Regular meetings are held for the Chief Audit Executive to report to the Audit Committee. These include an enterprise-wide risk assessment that highlights cybersecurity risks and cybersecurity risk mitigation actions. Additionally, the Audit Committee receives updates on significant incidents and cybersecurity risks that have been presented to or discussed with the Enterprise Risk & Compliance Committee.
Cybersecurity Risk Management Positions or Committees Responsible Report to Board [Flag]	true

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2024
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Consolidation	The accompanying 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, as well as 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 10 – Tower Obligations . Intercompany transactions and balances have been eliminated in consolidation. We operate as a single operating segment. The preparation of financial statements in conformity with U.S. generally accepted accounting principles (“GAAP”) requires our management to make estimates and assumptions which affect our consolidated financial statements and accompanying notes. Estimates are based on historical experience, where applicable, and other assumptions which our management believes are reasonable under the circumstances. These estimates are inherently subject to judgment and actual results could differ from those estimates.
Basis of Accounting	The preparation of financial statements in conformity with U.S. generally accepted accounting principles (“GAAP”) requires our management to make estimates and assumptions which affect our consolidated financial statements and accompanying notes.
Use of Estimates	Estimates are based on historical experience, where applicable, and other assumptions which our management believes are reasonable under the circumstances. These estimates are inherently subject to judgment and actual results could differ from those estimates.
Cash and Cash Equivalents	Cash and Cash Equivalents Cash equivalents consist of highly liquid money market funds and U.S. Treasury securities with remaining maturities of three months or less at the date of purchase.
Receivables and Related Allowance for Credit Losses	Receivables and Related Allowance for Credit Losses Accounts Receivable Accounts receivable balances are predominantly comprised of amounts currently due from customers (e.g., for wireless communications services), device insurance administrators, wholesale partners, other carriers and third-party retail channels. Accounts receivable are presented on our Consolidated Balance Sheets at their amortized cost basis (i.e., the receivables’ unpaid principal balance (“UPB”) as adjusted for any written-off amounts relating to impairment), net of the allowance for credit losses. We have an arrangement to sell certain of our customer service accounts receivable on a revolving basis, which are treated as sales of financial assets. See Note 5 – Sales of Certain Receivables for further information. Equipment Installment Plan Receivables We offer certain customers the option to pay for their devices and other purchases in installments, generally over a period of 24 months, using an EIP. EIP receivables are presented on our Consolidated Balance Sheets at their amortized cost basis (i.e., the receivables’ UPB as adjusted for any written-off amounts due to impairment and unamortized discounts), net of the allowance for credit losses. At the time of an installment sale, we impute a discount for interest if the term exceeds 12 months as there is no stated rate of interest on the receivables. The receivables are recorded at their present value, which is determined by discounting expected future cash payments at the imputed interest rate. This adjustment results in a discount or reduction in the transaction price of the contract with a customer, which is allocated to the performance obligations of the arrangement such as Service and Equipment revenues on our Consolidated Statements of Comprehensive Income. The imputed discount rate reflects a current market interest rate and includes a component for estimated credit risk underlying the EIP receivable, reflecting the estimated credit worthiness of the customer. The imputed discount on receivables is amortized over the financed installment term using the effective interest method and recognized as Other revenues on our Consolidated Statements of Comprehensive Income. The current portion of the EIP receivables is included in Equipment installment plan receivables, net and the long-term portion of the EIP receivables is included in Equipment installment plan receivables due after one year, net on our Consolidated Balance Sheets. We have an arrangement to sell certain EIP receivables on a revolving basis, which are treated as sales of financial assets. See Note 5 – Sales of Certain Receivables for further information. Additionally, certain of our EIP receivables included on our Consolidated Balance Sheets secure our asset-backed notes (“ABS Notes”). See Note 9 – Debt for further information. 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 (i.e., accounts receivable and EIP receivable portfolio segments) as of period end. Each portfolio segment is comprised of pools of receivables that are evaluated collectively based on similar risk characteristics. Our allowance levels consider estimated credit risk over the contractual life of the receivables and are influenced by receivable volumes, receivable delinquency status, historical loss experience and other conditions that affect loss expectations, such as changes in credit and collections policies and forecasts of macroeconomic conditions. While we attribute portions of the allowance to our respective portfolio segments, the entire allowance is available to credit losses related to the total receivable portfolio. We consider a receivable past due and delinquent 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. If there is a deterioration of our customers’ financial condition or if future actual default rates on receivables in general differ from those currently anticipated, we will adjust our allowance for credit losses accordingly.
Inventories	Inventories Inventories consist primarily of wireless devices and accessories, which are valued at the lower of cost or net realizable value. Cost is determined using standard cost, which approximates average cost. Shipping and handling costs paid to wireless device and accessories vendors as well as costs to refurbish used devices are included in the standard cost of inventory. Net realizable value is the estimated selling price in the ordinary course of business, less reasonably predictable costs of disposal and transportation. We record inventory write-downs to net realizable value for obsolete and slow-moving items based on inventory turnover trends and historical experience.
Recourse Guarantee and Deferred Purchase Price Assets	Recourse Guarantee Liabilities and Deferred Purchase Price Assets
Long-Lived Assets and Property and Equipment	Long-Lived Assets Long-lived assets include assets that do not have indefinite lives, such as property and equipment and certain intangible assets. Property and Equipment Property and equipment consists of buildings and equipment, including certain network server equipment, wireless communications systems, leasehold improvements, capitalized software, leased wireless devices and construction in progress. Wireless communications systems include assets to operate our wireless network and information technology data centers, including tower assets, leasehold improvements and asset retirement costs. Leasehold improvements include asset improvements other than those related to the wireless network. Property and equipment are recorded at cost less accumulated depreciation and impairments, if any, in Property and equipment, net on our Consolidated Balance Sheets. We generally depreciate property and equipment over the period the property and equipment provide economic benefit using the straight-line method. Depreciable life studies are performed periodically to confirm the appropriateness of depreciable lives for certain categories of property and equipment. These studies take into account actual usage, physical wear and tear, replacement history and assumptions about technology evolution. When these factors indicate the useful life of an asset is different from the previous assessment, the remaining book value is depreciated prospectively over the adjusted remaining estimated useful life. Leasehold improvements are depreciated over the shorter of their estimated useful lives or the related lease term. Costs of major replacements and improvements are capitalized. Repair and maintenance expenditures which do not enhance or extend the asset’s useful life are charged to operating expenses as incurred. Construction costs, labor and overhead incurred in the expansion or enhancement of our wireless network are capitalized. Capitalization commences with pre-construction period administrative and technical activities, which include obtaining zoning approvals and building permits, and ceases at the point at which the asset is ready for its intended use. We capitalize interest associated with the acquisition or construction of certain property and equipment. Capitalized interest is reported as a reduction in interest expense and depreciated over the useful life of the related asset.
Asset Retirement Obligations	We record an asset retirement obligation for the estimated fair value of legal obligations associated with the retirement of tangible long-lived assets and a corresponding increase in the carrying amount of the related asset in the period in which the obligation is incurred. In periods subsequent to initial measurement, we recognize changes in the liability resulting from the passage of time and revisions to either the timing or the amount of the original estimate. Over time, the liability is accreted to its present value and the capitalized cost is depreciated over the estimated useful life of the asset. Our obligations relate primarily to certain legal obligations to remediate leased property on which our network infrastructure and administrative assets are located.
Software Capitalization	We capitalize certain costs incurred in connection with developing or acquiring internal use software. Capitalization of software costs commences once the final selection of the specific software solution has been made and management authorizes and commits to funding the software project and ceases once the project is ready for its intended use. Capitalized software costs are included in Property and equipment, net on our Consolidated Balance Sheets and are amortized on a straight-line basis over the estimated useful life of the asset. Costs incurred during the preliminary project stage, as well as maintenance and training costs, are expensed as incurred.
Other Intangible Assets	Other Intangible Assets Intangible assets that do not have indefinite useful lives are amortized over their estimated useful lives. Customer relationships are amortized using the sum-of-the-years digits method. The remaining finite-lived intangible assets are amortized using the straight-line method.
Impairment	Impairment Impairment We assess the carrying value of our goodwill and other indefinite-lived intangible assets, such as our spectrum license portfolio, for potential impairment annually as of December 31 or more frequently, if events or changes in circumstances indicate such assets might be impaired. We test goodwill on a reporting unit basis by comparing the estimated fair value of the reporting unit to its book value. If the fair value exceeds the book value, then no impairment is measured. As of December 31, 2024, we have identified one reporting unit: wireless. The wireless reporting unit consists of all the assets and liabilities of T-Mobile US, Inc. When assessing goodwill for impairment we may elect to first perform a qualitative assessment to determine if the quantitative impairment test is necessary. If we do not perform a qualitative assessment, or if the qualitative assessment indicates it is more likely than not that the fair value of a reporting unit is less than its carrying amount, we perform a quantitative test. We recognize an impairment charge for the amount by which the carrying amount exceeds the reporting unit’s fair value; however, the loss recognized would not exceed the total amount of goodwill allocated to that reporting unit. We employ a qualitative approach to assess the wireless reporting unit. The fair value of the wireless reporting unit is determined using a market approach, which is based on market capitalization. We recognize that market capitalization is subject to volatility and will monitor changes in market capitalization to determine whether declines, if any, necessitate an interim impairment review. In the event market capitalization does decline below its book value, we will consider the length, severity and reasons for the decline when assessing whether potential impairment exists, including considering whether a control premium should be added to the market capitalization. We believe short-term fluctuations in share price may not necessarily reflect the underlying aggregate fair value. No events or change in circumstances have occurred that indicate the fair value of the wireless reporting unit may be below its carrying amount at December 31, 2024. We test our spectrum licenses for impairment on an aggregate basis, consistent with our management of the overall business at a national level. We may elect to first perform a qualitative assessment to determine whether it is more likely than not that the fair value of an intangible asset is less than its carrying value. If we do not perform the qualitative assessment, or if the qualitative assessment indicates it is more likely than not that the fair value of the intangible asset is less than its carrying amount, we calculate the estimated fair value of the intangible asset. If the estimated fair value of the spectrum licenses is lower than their carrying amount, an impairment loss is recognized for the difference. We employ the qualitative method. We estimate fair value of spectrum licenses using the Greenfield methodology. The Greenfield methodology values the spectrum licenses by calculating the cash flow generating potential of a hypothetical start-up company that goes into business with no assets except for the asset to be valued (in this case, spectrum licenses) and makes investments required to build an operation comparable to current use. The value of the spectrum licenses is the present value of the cash flows of this hypothetical start-up company. We base the assumptions underlying the Greenfield methodology on a combination of market participant data and our historical results, trends and business plans. Future cash flows in the Greenfield methodology are based on estimates and assumptions of market participant revenues, EBITDA margin, network build-out period and a long-term growth rate for a market participant. The cash flows are discounted using a weighted-average cost of capital. No events or change in circumstances have occurred that indicate the fair value of the Spectrum licenses may be below their carrying amount at December 31, 2024. The valuation approaches utilized to estimate fair value for the purposes of the impairment tests of goodwill and spectrum licenses may require that management make difficult, subjective and complex judgements about matters that are inherently uncertain. If actual results or future expectations are not consistent with the assumptions used in our estimate of fair value, it may result in the recording of significant impairment charges on goodwill or spectrum licenses. The most significant assumptions within the valuation models are the discount rate based on the weighted-average cost of capital, revenues, EBITDA margins, capital expenditures and long-term growth rate.
Business Combinations	Business Combinations Assets acquired and liabilities assumed as part of a business combination are generally recorded at their fair value at the date of acquisition. The excess of purchase price over the fair value of assets acquired and liabilities assumed is recorded as goodwill. Determining fair value of identifiable assets, particularly intangibles, and liabilities acquired requires management to make estimates, which are based on all available information and in some cases assumptions with respect to the timing and amount of future revenues and expenses associated with an asset or liability. See Note 2 – Business Combinations for further discussion of our acquisitions.
Goodwill	Goodwill Goodwill consists of the excess of the purchase price over the fair value of identifiable net assets acquired in a business combination and is assigned to our one reporting unit: wireless.
Spectrum Licenses	Spectrum Licenses Spectrum licenses are carried at costs incurred to acquire the spectrum licenses and the costs to prepare the spectrum licenses for their intended use, such as costs to clear acquired spectrum licenses. The FCC issues spectrum licenses which provide us with the exclusive right to utilize designated radio frequency spectrum within specific geographic service areas to provide wireless communications services. Spectrum licenses are issued for a fixed period of time, typically up to 15 years; however, the FCC has granted license renewals routinely and at a nominal cost. The spectrum licenses acquired expire at various dates and we believe we will be able to meet all requirements necessary to secure renewal of our spectrum licenses at a nominal cost. Moreover, we determined that there are currently no legal, regulatory, contractual, competitive, economic or other factors that limit the useful lives of our spectrum licenses. The utility of radio frequency spectrum does not diminish while activated on our network nor does it otherwise deteriorate over time. Therefore, we determined the spectrum licenses should be treated as indefinite-lived intangible assets. At times, we enter into agreements to sell or exchange spectrum licenses. Upon entering into a sale or exchange arrangement, if the transaction has been deemed to have commercial substance and the spectrum licenses meet the held for sale criteria, the licenses are classified as held for sale at their carrying value, as adjusted for any impairment recognized, included in Other current assets or Other assets on our Consolidated Balance Sheets until approval and completion of the sale or an exchange. Upon closing of the transaction, spectrum licenses acquired as part of an exchange of nonmonetary assets are recorded at fair value and the difference between the fair value of the spectrum licenses obtained, carrying value of the spectrum licenses transferred and cash paid, if any, is recognized as a gain or loss on disposal of spectrum licenses included in Selling, general and administrative expenses on our Consolidated Statements of Comprehensive Income. Our fair value estimates of spectrum licenses are based on information for which there is little or no observable market data. If the transaction lacks commercial substance or the fair value is not measurable, the acquired spectrum licenses are recorded at our carrying value of the spectrum assets transferred or exchanged. We have lease agreements (the “Agreements”) with various educational and non-profit institutions that provide us with the right to use Federal Communications Commission (“FCC”) spectrum licenses (known as “Educational Broadband Services” or “EBS” spectrum) in the 2.5 GHz band. The Agreements are typically for terms of five Leased FCC spectrum licenses are recorded as executory contracts, and contractual lease payments are recognized on a straight-line basis over the remaining term of the arrangement, including renewals, and are presented in Cost of services on our Consolidated Statements of Comprehensive Income. The spectrum licenses we hold plus the spectrum leases enhance the overall value of our spectrum licenses as the collective value is higher than the value of individual bands of spectrum within a specific geography. This value is derived from the ability to provide wireless service to customers across large geographic areas and maintain the same or similar wireless connectivity quality. This enhanced value from combining owned and leased spectrum licenses is referred to as an aggregation premium. The aggregation premium is a component of the overall fair value of our owned FCC spectrum licenses.
Fair Value Measurements	Fair Value Measurements We carry certain assets and liabilities at fair value. Fair value is defined as an exit price, representing the amount that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. The three-tier hierarchy for inputs used in measuring fair value, which prioritizes the inputs based on the observability as of the measurement date, is as follows: Level 1 Quoted prices in active markets for identical assets or liabilities; Level 2 Observable inputs other than the quoted prices in active markets for identical assets and liabilities; and Level 3 Unobservable inputs for which there is little or no market data, which require us to develop assumptions of what market participants would use in pricing the asset or liability. Assets and liabilities are classified in their entirety based on the lowest level of input that is significant to the fair value measurement. Our assessment of the significance of a particular input to the fair value measurement requires judgment and may affect the placement of assets and liabilities being measured within the fair value hierarchy.
Foreign Currency Transactions	Foreign Currency Transactions On May 8, 2024, we issued €2.0 billion of euro (“EUR”) denominated debt. T-Mobile’s functional currency is the U.S. dollar (“USD”). Each period, we convert activity and balances in EUR into USD using average exchange rates for the period for income statement amounts and using end-of-period or spot exchange rates for assets and liabilities. We record transaction gains and losses resulting from the conversion of transaction currency to functional currency as a component of Other income (expense), net on our Consolidated Statements of Comprehensive Income.
Derivative and Hedging Instruments	Derivative and Hedging Instruments The Company manages its exposure to foreign exchange rates and interest rates through a risk management program that includes the use of derivative financial instruments, including cross-currency swaps. We designate certain derivatives as accounting hedge relationships. We do not hold derivatives for trading or speculative purposes. We record derivatives on our Consolidated Balance Sheets and recognize them as either assets or liabilities at fair value. Fair value is derived primarily from observable market data, and our derivatives are classified as Level 2 in the fair value hierarchy. Cash flows associated with qualifying hedge derivative instruments are presented in the same category on our 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.
Revenue Recognition	Revenue Recognition We primarily generate our revenue from providing wireless communications services and selling devices and accessories to customers. Our contracts with customers may involve more than one performance obligation, which include wireless services, wireless devices or a combination thereof, and we allocate the transaction price between each performance obligation based on its relative standalone selling price. Wireless Communications Services Revenue We generate our wireless communications services revenues from providing access to, and usage of, our wireless communications network. Service revenues also include revenues earned for providing premium services to customers, such as device insurance services. Generally, service contracts are billed monthly in advance of services being transferred or are prepaid. Service revenue is recognized as we satisfy our performance obligation to transfer service to our customers. We typically satisfy our stand-ready performance obligations, including unlimited wireless services, evenly over the contract term as services are transferred to our customers. The enforceable duration of our postpaid service contracts with customers is typically one month. However, promotional EIP bill credits offered to a customer on an equipment sale that are paid over time and are contingent on the customer maintaining a service contract may result in an extended service contract based on whether a substantive penalty is deemed to exist. Revenue is recorded net of costs paid to a third party for performance obligations where we facilitate an arrangement for the other party to transfer goods or services to our customer (i.e., when we are acting as an agent). For example, performance obligations relating to services provided by third-party content providers where we neither control a right to the content provider’s service nor control the underlying service itself are presented net. Consideration payable to a customer is treated as a reduction of the total transaction price, unless the payment is in exchange for a distinct good or service, such as certain commissions paid to dealers, in which case the payment is treated as a purchase of that distinct good or service. Federal Universal Service Fund (“USF”) and state USF fees are assessed to T-Mobile by various governmental authorities in connection with the services we provide to our customers and are included in Cost of services. When we separately bill and collect these regulatory fees from customers, they are recorded gross in Total service revenues on our Consolidated Statements of Comprehensive Income. For the years ended December 31, 2024, 2023 and 2022, we recorded approximately $386 million, $317 million and $185 million, respectively, of USF fees on a gross basis. We have made an accounting policy election to exclude from the measurement of the transaction price all taxes assessed to the customer by a governmental authority that are both imposed on and concurrent with a specific revenue-producing transaction and collected by us from a customer on behalf of the taxing agency (e.g., sales, use, value added, and some excise taxes). Equipment Revenues We generate equipment revenues from the sale of mobile communication devices and accessories. Equipment revenues related to device and accessory sales are typically recognized at a point in time when control of the device or accessory is transferred to the customer or dealer. We have elected to account for shipping and handling activities that occur after control of the related good transfers as fulfillment activities, as opposed to performance obligations. We estimate variable consideration (e.g., device returns or certain payments to indirect dealers) primarily based on historical experience. Equipment sales for which we determine it is not probable that we will collect substantially all of the transaction price are generally recorded as payments are received. Our assessment of collectibility considers contract terms such as down payments that reduce our exposure to credit risk. We offer certain customers the option to pay for devices and accessories in installments using an EIP. This financing option is provided at a stated interest of zero and is typically over a 24-month period. We recognize as a reduction of the total transaction price the effects of a financing component in contracts via the imputation of interest when customers purchase their devices and accessories on an EIP, including those financing components that are not considered to be significant to the contract. However, we have elected the practical expedient of not recognizing the effects of a significant financing component for contracts where we expect, at contract inception, that the period between the transfer of a performance obligation to a customer and the customer’s payment for that performance obligation will be one year or less. Imputed Interest on EIP Receivables For EIP with a duration greater than one year, we record the effects of financing via the imputation of interest. This is performed on all such EIP receivables regardless as to whether or not the financing is considered to be significant. The imputation of interest results in a discount of the EIP receivable, thereby adjusting the transaction price of the contract with the customer, which is then allocated to the performance obligations of the arrangement. Judgment is required to determine the imputed interest rate. For EIP sales, the imputed rate used to adjust the transaction price reflects current market interest rates, including the estimated credit risk of the underlying customers. Customer credit behavior is inherently uncertain. See “Receivables and Related Allowance for Credit Losses” above, for additional discussion on how we assess credit risk. Contract Balances Generally, our devices and service plans are available at standard prices, which are maintained on price lists and published on our website and/or within our retail stores. For contracts that involve more than one product or service that are identified as separate performance obligations, the transaction price is allocated to the performance obligations based on their relative standalone selling prices. The standalone selling price is the price at which we would sell the good or service separately, on a standalone basis, to similar customers in similar circumstances. A contract asset is recorded when revenue is recognized in advance of our right to receive consideration (i.e., we must perform additional services in order to receive consideration). Amounts are recorded as receivables when our right to consideration is unconditional. When consideration is received, or we have an unconditional right to consideration in advance of delivery of goods or services, a contract liability is recorded. The transaction price can include non-refundable upfront fees, which are allocated to the identifiable performance obligations. Contract assets are included in Other current assets and Other assets and contract liabilities are included in Deferred revenue on our Consolidated Balance Sheets. See Note 11 – Revenue from Contracts with Customers for further information. Contract Modifications Our service contracts allow customers to frequently modify their contracts without incurring penalties, in many cases. For contract modifications, we evaluate the change in scope or price of the contract to determine if the modification should be treated as a separate contract, as if there is a termination of the existing contract and creation of a new contract, or if the modification should be considered a change associated with the existing contract. We typically do not have significant impacts from contract modifications. Contract Costs We incur certain incremental costs to obtain a contract that we expect to recover, such as sales commissions. We record an asset when these incremental costs to obtain a contract are incurred and amortize them on a systematic basis that is consistent with the transfer to the customer of the goods or services to which the asset relates. We capitalize postpaid sales commissions for service activation as costs to acquire a contract and amortize them on a straight-line basis over the estimated period of benefit, currently 24 months. For capitalized contract costs, determining the amortization period over which such costs are recognized as well as assessing the indicators of impairment requires judgment. Prepaid commissions are expensed as incurred as their estimated period of benefit does not extend beyond 12 months. Commissions paid upon device upgrade are not capitalized if the remaining customer contract is less than one year.
Leases	Leases Cell Site, Retail Store and Office Facility Leases We are a lessee for non-cancelable operating and financing leases for cell sites, switch sites, retail stores, network equipment and office facilities. We recognize a right-of-use asset and lease liability for operating leases based on the net present value of future minimum lease payments. The right-of-use asset for an operating lease is based on the lease liability. Lease expense is recognized on a straight-line basis over the non-cancelable lease term and renewal periods that are considered reasonably certain. In addition, we have financing leases for certain network equipment. We recognize a right-of-use asset and lease liability for financing leases based on the net present value of future minimum lease payments. The right-of-use asset for a finance lease is based on the lease liability. Expense for our financing leases is comprised of the amortization expense associated with the right-of-use asset and interest expense recognized based on the effective interest method. We include options to extend or terminate a lease when we are reasonably certain that we will exercise that option. We consider several factors in assessing whether renewal periods are reasonably certain of being exercised, including the continued maturation of our nationwide network, technological advances within the telecommunications industry and the availability of alternative sites. We have generally concluded we are not reasonably certain to exercise the options to extend or terminate our leases. Therefore, as of the lease commencement date, our lease terms generally do not include these options. In determining the discount rate used to measure the right-of-use asset and lease liability, we use rates implicit in the lease, or if not readily available, we use our incremental borrowing rate. Our incremental borrowing rate is based on an estimated secured rate comprised of a risk-free rate plus a credit spread as secured by our assets. Determining a credit spread as secured by our assets may require judgment. Certain of our lease agreements include rental payments based on changes in the consumer price index (“CPI”). Lease liabilities are not remeasured as a result of changes in the CPI; instead, changes in the CPI are treated as variable lease payments and are excluded from the measurement of the right-of-use asset and lease liability. These payments are recognized in the period in which the related obligation is incurred. Our lease agreements do not contain any material residual value guarantees or material restrictive covenants. Generally, we elected the practical expedient to not separate lease and non-lease components in arrangements. We did not elect the short-term lease recognition exemption; as such, leases with terms shorter than 12 months are included as a right-of-use asset and lease liability. Rental revenues and expenses associated with co-location tower sites are presented on a net basis under Topic 842. See Note 1 7 – Leases for further information. Cell Tower Monetization Transactions In 2012, we entered into a prepaid master lease arrangement in which we as the lessor provided the rights to utilize tower sites and we leased back space on certain of those towers. Prior to our merger (the “Merger”) with Sprint Corporation (“Sprint”), Sprint entered into a similar lease-out and leaseback arrangement that we assumed in the Merger. These arrangements are treated as failed sale leasebacks in which the proceeds received are reported as a financing obligation. The principal payments on the tower obligations are included in Other, net within Net cash provided by (used in) financing activities on our Consolidated Statements of Cash Flows.
Sprint Retirement Pension Plan	Sprint Retirement Pension Plan We provide the Sprint Retirement Pension Plan (the “Pension Plan”), which is a defined benefit pension plan providing postretirement benefits to certain employees. As of December 31, 2005, the Pension Plan was amended to freeze benefit plan accruals for participants.
Advertising Expense	Advertising Expense
Income Taxes	Income Taxes Deferred tax assets and liabilities are recognized based on temporary differences between the consolidated financial statements and tax bases of assets and liabilities using enacted tax rates expected to be in effect when these differences are realized. A valuation allowance is recorded when it is more likely than not that some portion or all of a deferred tax asset will not be realized. The ultimate realization of a deferred tax asset depends on the ability to generate sufficient taxable income of the appropriate character and in the appropriate taxing jurisdictions within the carryforward periods available. We account for uncertainty in income taxes recognized on our consolidated financial statements in accordance with the accounting guidance for the financial statement recognition and measurement of a tax position taken or expected to be taken in a tax return. We assess whether it is more likely than not that a tax position will be sustained upon examination based on the technical merits of the position and adjust the unrecognized tax benefits in light of changes in facts and circumstances, such as changes in tax law, interactions with taxing authorities and developments in case law.
Other Comprehensive Income	Other Comprehensive Income Other comprehensive income primarily consists of adjustments, net of tax, related to reclassification of loss from cash flow hedges, fair value hedges, foreign currency translation, pension and other postretirement benefits. This is reported in Accumulated other comprehensive loss as a separate component of stockholders’ equity until realized in earnings.
Stock-Based Compensation	Stock-Based Compensation Stock-based compensation expense for stock awards, which include restricted stock units (“RSUs”) and performance-based restricted stock units (“PRSUs”), is measured at fair value on the grant date and recognized as expense, net of expected forfeitures, over the related service period. The fair value of stock awards is based on the closing price of our common stock on the date of grant, adjusted for expected dividend yield. RSUs are recognized as expense using the straight-line method. PRSUs are recognized as expense following a graded vesting schedule with their performance reassessed and updated on a quarterly basis, or more frequently as changes in facts and circumstances warrant.
Stockholder Return Programs	Stockholder Return Programs On September 8, 2022, our Board of Directors authorized a stock repurchase program for up to $14.0 billion of our common stock through September 30, 2023 (the “2022 Stock Repurchase Program”). On September 6, 2023, our Board of Directors authorized a stockholder return program of up to $19.0 billion through December 31, 2024 (the “2023-2024 Stockholder Return Program”). The 2023-2024 Stockholder Return Program consisted of additional repurchases of shares of our common stock and the payment of cash dividends. On December 13, 2024, we announced that our Board of Directors authorized our 2025 Stockholder Return Program of up to $14.0 billion that will run through December 31, 2025 (“2025 Stockholder Return Program”). The 2025 Stockholder Return Program is expected to consist of additional repurchases of shares of our common stock and the payment of cash dividends. The amount available under the 2025 Stockholder Return Program for share repurchases will be reduced by the amount of any cash dividends declared and paid by us. The cost of repurchased shares, including equity reacquisition costs and related taxes, is included in Treasury stock on our Consolidated Balance Sheets. We accrue the cost of repurchased shares and exclude such shares from the calculation of basic and diluted earnings per share, as of the trade date. We recognize a liability for share repurchases which have not settled and for which cash has not been paid in Other current liabilities on our Consolidated Balance Sheets. Cash payments to reacquire our shares, including equity reacquisition costs and related taxes, are included in Repurchases of common stock on our Consolidated Statements of Cash Flows.
Earnings Per Share	Earnings Per Share
Variable Interest Entities	Variable Interest Entities VIEs are entities that lack sufficient equity to permit the entity to finance its activities without additional subordinated financial support from other parties, have equity investors that do not have the ability to make significant decisions relating to the entity's operations through voting rights, do not have the obligation to absorb the expected losses or do not have the right to receive the residual returns of the entity. The most common type of VIE is a special purpose entity (“SPE”). SPEs are commonly used in securitization transactions in order to isolate certain assets and distribute the cash flows from those assets to investors. SPEs are generally structured to insulate investors from claims on the SPEs’ assets by creditors of other entities, including the creditors of the seller of the assets, these SPEs are commonly referred to as being bankruptcy remote. The primary beneficiary is required to consolidate the assets and liabilities of a VIE. The primary beneficiary is the party which has both the power to direct the activities of an entity that most significantly impact the VIE's economic performance, and through its interests in the VIE, the obligation to absorb losses or the right to receive benefits from the VIE which could potentially be significant to the VIE. In assessing which party is the primary beneficiary, all the facts and circumstances are considered, including each party’s role in establishing the VIE and its ongoing rights and responsibilities. This assessment includes, first, identifying the activities that most significantly impact the VIE’s economic performance; and second, identifying which party, if any, has power over those activities. In general, the parties that make the most significant decisions affecting the VIE (such as asset managers and servicers) or have the right to unilaterally remove those decision-makers are deemed to have the power to direct the activities of a VIE.
Accounting Pronouncements Adopted During the Current Year and Not Yet Adopted	Accounting Pronouncements Adopted During the Current Year Segment Reporting Disclosures In November 2023, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2023-07, “Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures.” The standard expands reportable segment disclosure requirements for public business entities primarily through enhanced disclosures about significant segment expenses that are regularly provided to the chief operating decision maker (“CODM”) and included within each reported measure of segment profit (referred to as the “significant expense principle”). We have adopted this standard for our fiscal year 2024 annual financial statements and interim financial statements thereafter and have applied this standard retrospectively for all prior periods presented in the financial statements. See Note 12 – Segment Reporting for further information. Accounting Pronouncements Not Yet Adopted Income Tax Disclosures In December 2023, the FASB issued ASU 2023-09, “Income Taxes (Topic 740): Improvements to Income Tax Disclosures.” The standard enhances income tax disclosure requirements for all entities by requiring specified categories and greater disaggregation within the rate reconciliation table, disclosure of income taxes paid by jurisdiction, and providing clarification on uncertain tax positions and related financial statement impacts. The standard will be effective for us for our fiscal year 2025 annual financial statements with early adoption permitted. We plan to adopt the standard when it becomes effective for us beginning in our fiscal year 2025 annual financial statements, and we expect the adoption of the standard will impact certain of our income tax disclosures. 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.

Business Combinations (Tables)

Business Combinations (Tables)	12 Months Ended
	Dec. 31, 2024
Business Combination, Asset Acquisition, and Joint Venture Formation [Abstract]
Schedule of Fair Value of Consideration Transferred	The acquisition-date fair value of consideration transferred in the Ka’ena Acquisition totaled $1.1 billion, comprised of the following: (in millions) May 1, 2024 Fair value of T-Mobile common stock issued to Ka’ena stockholders related to the adjusted upfront payment $ 527 Fair value of cash paid to Ka’ena stockholders related to the adjusted upfront payment 396 Fair value of contingent consideration 191 Fair value of deferred consideration 27 Total fair value of consideration exchanged $ 1,141
Schedule of Amounts Recognized as of Acquisition Date	The following table summarizes the provisionally assigned fair values for each class of assets acquired and liabilities assumed at the Acquisition Date. We retained the services of certified valuation specialists to assist with assigning values to certain acquired assets. We are in the process of finalizing the valuation of the assets acquired and liabilities assumed, including income tax-related amounts. Therefore, the provisionally assigned fair values set forth below are subject to adjustment as additional information is obtained and the valuations are completed. (in millions) May 1, 2024 Cash and cash equivalents $ 24 Accounts receivable 34 Inventory 3 Prepaid expenses 5 Other current assets 10 Property and equipment 1 Operating lease right-of-use assets 2 Goodwill 771 Other intangible assets 740 Other assets 51 Total assets acquired 1,641 Accounts payable and accrued liabilities 42 Deferred revenue 297 Short-term operating lease liabilities 1 Deferred tax liabilities 86 Operating lease liabilities 2 Other long-term liabilities 72 Total liabilities assumed 500 Total consideration transferred $ 1,141

Receivables and Related Allow_2

Receivables and Related Allowance for Credit Losses (Tables)	12 Months Ended
	Dec. 31, 2024
Receivables [Abstract]
Schedule of Equipment Installment Plan Receivables	The following table summarizes the EIP receivables, including imputed discounts and related allowance for credit losses: (in millions) December 31, December 31, EIP receivables, gross $ 7,402 $ 7,271 Unamortized imputed discount (524) (505) EIP receivables, net of unamortized imputed discount 6,878 6,766 Allowance for credit losses (290) (268) EIP receivables, net of allowance for credit losses and imputed discount $ 6,588 $ 6,498 Classified on our consolidated balance sheets as: Equipment installment plan receivables, net of allowance for credit losses and imputed discount $ 4,379 $ 4,456 Equipment installment plan receivables due after one year, net of allowance for credit losses and imputed discount 2,209 2,042 EIP receivables, net of allowance for credit losses and imputed discount $ 6,588 $ 6,498
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 December 31, 2024: Originated in 2024 Originated in 2023 Originated prior to 2023 Total EIP Receivables, Net of (in millions) Prime Subprime Prime Subprime Prime Subprime Prime Subprime Total Current - 30 days past due $ 4,213 $ 1,109 $ 1,118 $ 283 $ 18 $ 6 $ 5,349 $ 1,398 $ 6,747 31 - 60 days past due 15 27 6 7 — — 21 34 55 61 - 90 days past due 9 19 4 6 — — 13 25 38 More than 90 days past due 7 17 5 7 1 1 13 25 38 EIP receivables, net of unamortized imputed discount $ 4,244 $ 1,172 $ 1,133 $ 303 $ 19 $ 7 $ 5,396 $ 1,482 $ 6,878
Schedule of Write Offs Net of Recoveries	The following table presents write-offs of our EIP receivables by year of origination for the year ended December 31, 2024: (in millions) Originated in 2024 Originated in 2023 Originated prior to 2023 Total Write-offs $ 201 $ 309 $ 68 $ 578
Schedule of Unamortized Imputed Discount and Allowance for Credit Losses for Equipment Installment Plan Receivables	Activity for the years ended December 31, 2024, 2023 and 2022, in the allowance for credit losses and unamortized imputed discount balances for the accounts receivable and EIP receivables segments were as follows: December 31, 2024 December 31, 2023 December 31, 2022 (in millions) Accounts Receivable Allowance EIP Receivables Allowance Total Accounts Receivable Allowance EIP Receivables Allowance Total Accounts Receivable Allowance EIP Receivables Allowance Total Allowance for credit losses and imputed discount, beginning of period $ 161 $ 773 $ 934 $ 167 $ 811 $ 978 $ 146 $ 630 $ 776 Bad debt expense 592 600 1,192 440 458 898 433 593 1,026 Write-offs (577) (578) (1,155) (446) (518) (964) (412) (518) (930) Change in imputed discount on short-term and long-term EIP receivables N/A 199 199 N/A 220 220 N/A 262 262 Impact on the imputed discount from sales of EIP receivables N/A (180) (180) N/A (198) (198) N/A (156) (156) Allowance for credit losses and imputed discount, end of period $ 176 $ 814 $ 990 $ 161 $ 773 $ 934 $ 167 $ 811 $ 978

Sales of Certain Receivables (T

Sales of Certain Receivables (Tables)	12 Months Ended
	Dec. 31, 2024
Transfers and Servicing [Abstract]
Schedule of Variable Interest Entities - EIP	The following table summarizes the carrying amounts and classification of assets, which consist primarily of the deferred purchase price, and liabilities, which consist of the recourse guarantee, included on our Consolidated Balance Sheets with respect to the EIP BRE: (in millions) December 31, December 31, Other current assets $ 1 $ 348 Other assets — 103 Other current liabilities 81 — Other long-term liabilities 32 —
Schedule of Variable Interest Entities	The following table summarizes the carrying amounts and classification of assets, which consists primarily of the deferred purchase price, and liabilities included on our Consolidated Balance Sheets with respect to the Service BRE: (in millions) December 31, December 31, Other current assets $ — $ 209 Other current liabilities 328 373 The following table summarizes the carrying amounts and classification of assets and liabilities included in our Consolidated Balance Sheets with respect to the ABS Entities: (in millions) December 31, December 31, Assets Equipment installment plan receivables, net $ 1,472 $ 739 Equipment installment plan receivables due after one year, net 352 168 Other current assets 151 101 Liabilities Accounts payable and accrued liabilities 2 1 Short-term debt 570 198 Long-term debt 996 550
Schedule of Factoring Arrangement	The following table summarizes the impact of the sales of certain service receivables and EIP receivables on our Consolidated Balance Sheets: (in millions) December 31, December 31, Derecognized net service accounts receivable and EIP receivables $ 1,616 $ 2,388 Other current assets 1 557 of which, deferred purchase price — 555 Other assets — 103 of which, deferred purchase price — 103 Other current liabilities 409 373 of which, recourse guarantee 116 — Other long-term liabilities 32 — of which, recourse guarantee 32 — Net cash proceeds since inception 1,468 1,583 Of which: Change in net cash proceeds during the year-to-date period (115) (114) Net cash proceeds funded by reinvested collections 1,583 1,697

Property and Equipment (Tables)

Property and Equipment (Tables)	12 Months Ended
	Dec. 31, 2024
Property, Plant and Equipment [Abstract]
Schedule of Property and Equipment	The components of property and equipment, excluding amounts transferred to held for sale, were as follows: (in millions) Useful Lives December 31, December 31, Land $ 69 $ 72 Buildings and equipment Up to 30 years 4,377 4,465 Wireless communications systems Up to 20 years 65,778 65,628 Leasehold improvements Up to 10 years 2,588 2,489 Capitalized software Up to 8 years 18,566 22,573 Leased wireless devices Up to 16 months 145 400 Construction in progress N/A 3,377 3,286 Accumulated depreciation and amortization (56,367) (58,481) Property and equipment, net $ 38,533 $ 40,432
Schedule of Asset Retirement Obligations	Activity in our asset retirement obligations was as follows: (in millions) Year Ended Year Ended Asset retirement obligations, beginning of year $ 1,716 $ 1,852 Liabilities incurred 21 28 Liabilities settled (307) (399) Accretion expense 69 71 Changes in estimated cash flows 36 164 Asset retirement obligations, end of period $ 1,535 $ 1,716 Classified on the consolidated balance sheets as: Other current liabilities $ 109 $ 133 Other long-term liabilities 1,426 1,583

Goodwill, Spectrum License Tr_2

Goodwill, Spectrum License Transactions and Other Intangible Assets (Tables)	12 Months Ended
	Dec. 31, 2024
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Goodwill	The change in the carrying amount of goodwill for the years ended December 31, 2024 and 2023, is as follows: (in millions) Goodwill Balance as of December 31, 2022, net of accumulated impairment losses of $10,984 $ 12,234 Balance as of December 31, 2023 12,234 Preliminary goodwill from the Ka’ena Acquisition in 2024 771 Balance as of December 31, 2024, net of accumulated impairment losses of $10,984 $ 13,005
Schedule of Spectrum Licenses	The following table summarizes our spectrum license activity for the years ended December 31, 2024, 2023 and 2022: (in millions) 2024 2023 2022 Spectrum licenses, beginning of year $ 96,707 $ 95,798 $ 92,606 Spectrum license acquisitions 4,822 103 3,152 Spectrum licenses transferred to held for sale (1,024) (2) (64) Costs to clear spectrum 53 808 104 Spectrum licenses, end of year $ 100,558 $ 96,707 $ 95,798
Schedule of Other Intangible Assets	The components of Other intangible assets were as follows: Useful Lives December 31, 2024 December 31, 2023 (in millions) Gross Amount Accumulated Amortization Net Amount Gross Amount Accumulated Amortization Net Amount Customer relationships (1) Up to 8 years $ 5,427 $ (4,123) $ 1,304 $ 4,883 $ (3,451) $ 1,432 Reacquired rights Up to 9 years 770 (323) 447 770 (231) 539 Tradenames and patents (1) Up to 19 years 338 (157) 181 208 (134) 74 Favorable spectrum leases Up to 27 years 620 (169) 451 686 (148) 538 Other (1) Up to 10 years 478 (349) 129 353 (318) 35 Other intangible assets $ 7,633 $ (5,121) $ 2,512 $ 6,900 $ (4,282) $ 2,618 (1) Includes intangible assets acquired in the Ka’ena Acquisition. See Note 2 - Business Combinations
Schedule of Estimated Aggregate Future Amortization Expense	The estimated aggregate future amortization expense for intangible assets subject to amortization is summarized below: (in millions) Estimated Future Amortization Twelve Months Ending December 31, 2025 $ 749 2026 571 2027 404 2028 253 2029 171 Thereafter 364 Total $ 2,512

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	12 Months Ended
	Dec. 31, 2024
Fair Value Disclosures [Abstract]
Schedule of Carrying Values and Fair Values of Long-term Debt	The following table summarizes the activity of our cross-currency swaps: (in millions) Year Ended Other income (expense), net Pre-tax transaction gain on remeasurement of EUR-denominated debt $ 79 Amount recognized in Other income (expense), net reclassified from Accumulated other comprehensive loss (79) Accumulated other comprehensive loss Amount recognized in Accumulated other comprehensive loss reclassified to Other income (expense), net $ 79 Loss associated with the change in fair value of cross-currency swaps recognized in Accumulated other comprehensive loss (58)
Schedule of Carrying Values and Fair Values of Long-term Debt	The carrying amounts and fair values of our short-term and long-term debt included on our Consolidated Balance Sheets were as follows: (in millions) Level within the Fair Value Hierarchy December 31, 2024 December 31, 2023 Carrying Amount Fair Value Carrying Amount Fair Value Liabilities: Senior Notes to third parties 1 $ 71,783 $ 65,631 $ 70,493 $ 65,962 Senior Notes to third parties (EUR-denominated) 2 2,058 2,125 — — Senior Notes to affiliates 2 1,497 1,491 1,496 1,499 Senior Secured Notes to third parties 1 1,361 1,330 2,281 2,207 ABS Notes to third parties 2 1,566 1,570 748 748

Debt (Tables)

Debt (Tables)	12 Months Ended
	Dec. 31, 2024
Debt Disclosure [Abstract]
Schedule of Debt Balances and Activity	Debt was as follows: (in millions) December 31, December 31, 7.125% Senior Notes due 2024 $ — $ 2,500 3.500% Senior Notes due 2025 3,000 3,000 4.738% Series 2018-1 A-1 Notes due 2025 131 656 7.625% Senior Notes due 2025 — 1,500 1.500% Senior Notes due 2026 1,000 1,000 2.250% Senior Notes due 2026 1,800 1,800 2.625% Senior Notes due 2026 1,200 1,200 7.625% Senior Notes due 2026 1,500 1,500 3.750% Senior Notes due 2027 4,000 4,000 5.375% Senior Notes due 2027 500 500 2.050% Senior Notes due 2028 1,750 1,750 4.750% Senior Notes due 2028 1,500 1,500 4.750% Senior Notes to affiliates due 2028 1,500 1,500 4.800% Senior Notes due 2028 900 900 4.910% Class A Senior ABS Notes due 2028 570 750 4.950% Senior Notes due 2028 1,000 1,000 5.152% Series 2018-1 A-2 Notes due 2028 1,194 1,562 6.875% Senior Notes due 2028 2,475 2,475 2.400% Senior Notes due 2029 500 500 2.625% Senior Notes due 2029 1,000 1,000 3.375% Senior Notes due 2029 2,350 2,350 3.550% Senior Notes due 2029 (EUR-denominated) 621 — 4.200% Senior Notes due 2029 700 — 4.250% Class A Senior ABS Notes due 2029 500 — 4.850% Senior Notes due 2029 1,000 — 5.050% Class A Senior ABS Notes due 2029 500 — 3.875% Senior Notes due 2030 7,000 7,000 2.250% Senior Notes due 2031 1,000 1,000 2.550% Senior Notes due 2031 2,500 2,500 2.875% Senior Notes due 2031 1,000 1,000 3.500% Senior Notes due 2031 2,450 2,450 2.700% Senior Notes due 2032 1,000 1,000 3.700% Senior Notes due 2032 (EUR-denominated) 777 — 8.750% Senior Notes due 2032 2,000 2,000 5.050% Senior Notes due 2033 2,600 2,600 5.200% Senior Notes due 2033 1,250 1,250 5.150% Senior Notes due 2034 1,250 — 5.750% Senior Notes due 2034 1,000 1,000 4.700% Senior Notes due 2035 900 — 3.850% Senior Notes due 2036 (EUR-denominated) 673 — 4.375% Senior Notes due 2040 2,000 2,000 3.000% Senior Notes due 2041 2,500 2,500 4.500% Senior Notes due 2050 3,000 3,000 3.300% Senior Notes due 2051 3,000 3,000 3.400% Senior Notes due 2052 2,800 2,800 5.650% Senior Notes due 2053 1,750 1,750 5.750% Senior Notes due 2054 1,250 1,250 6.000% Senior Notes due 2054 1,000 1,000 5.250% Senior Notes due 2055 900 — 5.500% Senior Notes due 2055 750 — 3.600% Senior Notes due 2060 1,700 1,700 5.800% Senior Notes due 2062 750 750 Unamortized premium on debt to third parties 775 1,011 Unamortized discount on debt to third parties (223) (223) Debt issuance costs and consent fees (278) (263) Total debt 78,265 75,018 Less: Current portion of Senior Notes 4,068 3,619 Total long-term debt $ 74,197 $ 71,399 Long-term debt was classified as follows: (in millions) December 31, December 31, Long-term debt $ 72,700 $ 69,903 Long-term debt to affiliates 1,497 1,496 Total long-term debt $ 74,197 $ 71,399 During the year ended December 31, 2024, we issued the following Senior Notes and ABS Notes: (in millions) Principal Issuances Discounts and Issuance Costs Net Proceeds from Issuance of Long-Term Debt Issue Date 4.850% Senior Notes due 2029 $ 1,000 $ (6) $ 994 January 12, 2024 5.150% Senior Notes due 2034 1,250 (11) 1,239 January 12, 2024 5.500% Senior Notes due 2055 750 (7) 743 January 12, 2024 3.550% Senior Notes due 2029 (EUR-denominated) 645 (3) 642 May 8, 2024 3.700% Senior Notes due 2032 (EUR-denominated) 806 (4) 802 May 8, 2024 3.850% Senior Notes due 2036 (EUR-denominated) 699 (7) 692 May 8, 2024 4.200% Senior Notes due 2029 700 (4) 696 September 26, 2024 4.700% Senior Notes due 2035 900 (6) 894 September 26, 2024 5.250% Senior Notes due 2055 900 (10) 890 September 26, 2024 Total of Senior Notes issued $ 7,650 $ (58) $ 7,592 5.050% Class A Senior ABS Notes due 2029 $ 500 $ (3) $ 497 February 14, 2024 4.250% Class A Senior ABS Notes due 2029 500 (2) 498 October 9, 2024 Total of ABS Notes issued $ 1,000 $ (5) $ 995
Schedule of Debt Instrument Redemption and Repayments	During the year ended December 31, 2024, we made the following note redemptions and repayments: (in millions) Principal Amount Payment Date 7.125% Senior Notes due 2024 $ 2,500 June 15, 2024 7.625% Senior Notes due 2025 1,500 November 15, 2024 Total Redemptions $ 4,000 4.738% Secured Series 2018-1 A-1 Notes due 2025 $ 525 Various 5.152% Series 2018-1 A-2 Notes due 2028 368 Various 4.910% Class A Senior ABS Notes due 2028 180 Various Total Repayments $ 1,073
Schedule of Maturities of ABS Notes	The expected maturities of our ABS Notes as of December 31, 2024, were as follows: (in millions) Expected Maturities 2025 $ 570 2026 594 2027 406 Total $ 1,570
Schedule of Variable Interest Entities	The following table summarizes the carrying amounts and classification of assets, which consists primarily of the deferred purchase price, and liabilities included on our Consolidated Balance Sheets with respect to the Service BRE: (in millions) December 31, December 31, Other current assets $ — $ 209 Other current liabilities 328 373 The following table summarizes the carrying amounts and classification of assets and liabilities included in our Consolidated Balance Sheets with respect to the ABS Entities: (in millions) December 31, December 31, Assets Equipment installment plan receivables, net $ 1,472 $ 739 Equipment installment plan receivables due after one year, net 352 168 Other current assets 151 101 Liabilities Accounts payable and accrued liabilities 2 1 Short-term debt 570 198 Long-term debt 996 550

Tower Obligations (Tables)

Tower Obligations (Tables)	12 Months Ended
	Dec. 31, 2024
Leases [Abstract]
Schedule of Impacts to Consolidated Balance Sheets	The following table summarizes the balances associated with both of the tower arrangements on our Consolidated Balance Sheets: (in millions) December 31, December 31, Property and equipment, net $ 2,069 $ 2,220 Tower obligations 3,664 3,777 Other long-term liabilities 554 554

Revenue from Contracts with C_2

Revenue from Contracts with Customers (Tables)	12 Months Ended
	Dec. 31, 2024
Revenue from Contract with Customer [Abstract]
Schedule of Disaggregation of Revenue	Postpaid service revenues, including postpaid phone revenues and postpaid other revenues, were as follows: Year Ended December 31, (in millions) 2024 2023 2022 Postpaid service revenues Postpaid phone revenues $ 45,762 $ 43,449 $ 41,711 Postpaid other revenues 6,578 5,243 4,208 Total postpaid service revenues $ 52,340 $ 48,692 $ 45,919
Schedule of Contract Liability and Receivable Balances	The contract asset and contract liability balances from contracts with customers as of December 31, 2024 and 2023, were as follows: (in millions) Contract Contract Balance as of December 31, 2023 $ 607 $ 812 Balance as of December 31, 2024 720 1,219 Change $ 113 $ 407 Revenues for the years ended December 31, 2024, 2023 and 2022, include the following: Year Ended December 31, (in millions) 2024 2023 2022 Amounts included in the beginning of year contract liability balance $ 787 $ 747 $ 760

Segment Reporting (Tables)

Segment Reporting (Tables)	12 Months Ended
	Dec. 31, 2024
Segment Reporting [Abstract]
Schedule of Segment Reporting Information, by Segment	The following table provides the operating financial results of our Wireless segment: Year Ended December 31, (in millions) 2024 2023 2022 Total revenues $ 81,400 $ 78,558 $ 79,571 Less: Significant and other segment expenses Cost of equipment sales 18,882 18,533 21,540 Employee expenses 7,041 7,629 7,626 Lease expense 5,066 5,398 6,998 Advertising expense 3,067 2,515 2,306 Bad debt expense 1,192 898 1,026 Other segment items (1) 15,223 16,526 18,317 Impairment expense — — 477 (Gain) loss on disposal group held for sale — (25) 1,087 Depreciation and amortization 12,919 12,818 13,651 Interest expense, net 3,411 3,335 3,364 Other (income) expense, net (113) (68) 33 Income tax expense 3,373 2,682 556 Segment net income $ 11,339 $ 8,317 $ 2,590 (1)

Employee Compensation and Ben_2

Employee Compensation and Benefit Plans (Tables)	12 Months Ended
	Dec. 31, 2024
Share-Based Payment Arrangement [Abstract]
Schedule of Stock-based Compensation Expense and Related Income Tax Benefits	Stock-based compensation expense and related income tax benefits were as follows: As of and for the Year Ended December 31, (in millions, except shares, per share and contractual life amounts) 2024 2023 2022 Stock-based compensation expense $ 649 $ 667 $ 596 Income tax benefit related to stock-based compensation $ 129 $ 130 $ 114 Weighted-average fair value per stock award granted $ 162.99 $ 143.09 $ 126.89 Unrecognized compensation expense $ 645 $ 637 $ 635 Weighted-average period to be recognized (years) 1.8 1.8 1.8 Fair value of stock awards vested $ 820 $ 889 $ 743
Schedule of RSU and PRSU Awards Activity	The following activity occurred under the Incentive Plans during the year ended December 31, 2024: Time-Based Restricted Stock Units (in millions, except shares, per share and contractual life amounts) Number of Units or Awards Weighted-Average Grant Date Fair Value Weighted-Average Remaining Contractual Term (Years) Aggregate Intrinsic Value Nonvested, December 31, 2023 7,755,943 $ 136.67 0.9 $ 1,244 Prior year grant adjustment (351) 142.60 Granted 3,775,434 163.72 Vested (4,375,499) 135.88 Forfeited (518,292) 149.33 Nonvested, December 31, 2024 6,637,235 151.55 0.8 1,465 Performance-Based Restricted Stock Units (in millions, except shares, per share and contractual life amounts) Number of Units or Awards Weighted-Average Grant Date Fair Value Weighted-Average Remaining Contractual Term (Years) Aggregate Intrinsic Value Nonvested, December 31, 2023 689,806 $ 145.32 1.0 $ 111 Granted 146,154 164.65 Performance award achievement adjustments (1) 95,503 131.26 Vested (372,099) 127.55 Nonvested, December 31, 2024 559,364 159.79 0.9 123 (1) Represents PRSUs granted prior to 2024 for which the performance achievement period was completed in 2024, resulting in incremental unit awards. These PRSU awards are also included in the amount vested in 2024.
Schedule of Components of Net Expense Recognized for Pension Plan	The components of net benefit recognized for the Pension Plan were as follows: Year Ended December 31, (in millions) 2024 2023 2022 Interest on projected benefit obligations $ 83 $ 86 $ 65 Gain on settlement and amortization of actuarial gain (119) (59) — Expected return on pension plan assets (99) (97) (71) Net pension benefit $ (135) $ (70) $ (6)

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2024
Income Tax Disclosure [Abstract]
Schedule of Income (loss) before Income Tax	Our sources of Income before income taxes were as follows: Year Ended December 31, (in millions) 2024 2023 2022 U.S. income $ 14,607 $ 10,943 $ 3,116 Foreign income 105 56 30 Income before income taxes $ 14,712 $ 10,999 $ 3,146
Schedule of Components of Income Tax Expense (Benefit)	Income tax expense is summarized as follows: Year Ended December 31, (in millions) 2024 2023 2022 Current tax (expense) benefit Federal $ (57) $ (42) $ 22 State (179) (28) (64) Foreign (17) (12) (22) Total current tax expense (253) (82) (64) Deferred tax (expense) benefit Federal (2,743) (2,150) (628) State (348) (417) 77 Foreign (29) (33) 59 Total deferred tax expense (3,120) (2,600) (492) Total income tax expense $ (3,373) $ (2,682) $ (556)
Schedule of Effective Income Tax Rate Reconciliation	The reconciliation between the U.S. federal statutory income tax rate and our effective income tax rate is as follows: Year Ended December 31, 2024 2023 2022 Federal statutory income tax rate 21.0 % 21.0 % 21.0 % State taxes, net of federal benefit 3.3 4.2 4.5 Effect of law and rate changes 0.1 (0.1) (5.3) Change in valuation allowance (0.2) (0.2) (0.8) Foreign taxes 0.3 0.4 0.7 Permanent differences 0.3 (0.1) (0.2) Federal tax credits (1.1) (0.8) (2.4) Equity-based compensation (0.3) (0.4) (1.2) Non-deductible compensation (0.1) 0.5 1.2 Other, net (0.4) (0.1) 0.2 Effective income tax rate 22.9 % 24.4 % 17.7 %
Schedule of Deferred Tax Assets and Liabilities	Significant components of deferred income tax assets and liabilities, tax effected, are as follows: (in millions) December 31, December 31, Deferred tax assets Loss carryforwards $ 3,844 $ 6,227 Lease liabilities 7,781 8,355 Reserves and accruals 958 1,177 Other 3,959 4,459 Deferred tax assets, gross 16,542 20,218 Valuation allowance (259) (306) Deferred tax assets, net 16,283 19,912 Deferred tax liabilities Spectrum licenses 19,527 19,006 Property and equipment 5,874 6,142 Lease right-of-use assets 6,508 7,043 Other 1,074 1,179 Total deferred tax liabilities 32,983 33,370 Net deferred tax liabilities $ 16,700 $ 13,458 Classified on the consolidated balance sheets as: Deferred tax liabilities $ 16,700 $ 13,458
Schedule of Unrecognized Tax Benefits Roll Forward	A reconciliation of the beginning and ending amount of unrecognized tax benefits were as follows: Year Ended December 31, (in millions) 2024 2023 2022 Unrecognized tax benefits, beginning of year $ 1,477 $ 1,254 $ 1,217 Gross increases to tax positions in prior periods 140 19 31 Gross decreases to tax positions in prior periods (201) (39) (65) Gross increases to current period tax positions 132 256 77 Gross decreases due to settlements with taxing authorities (11) — (3) Gross decreases due to statute of limitations lapse (67) (13) (3) Unrecognized tax benefits, end of year $ 1,470 $ 1,477 $ 1,254

Earnings Per Share (Tables)

Earnings Per Share (Tables)	12 Months Ended
	Dec. 31, 2024
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: Year Ended December 31, (in millions, except shares and per share amounts) 2024 2023 2022 Net income $ 11,339 $ 8,317 $ 2,590 Weighted-average shares outstanding – basic 1,169,195,373 1,185,121,562 1,249,763,934 Effect of dilutive securities: Outstanding stock options, unvested stock awards and SoftBank contingent consideration (2) 4,018,525 15,164,702 5,612,835 Weighted-average shares outstanding – diluted 1,173,213,898 1,200,286,264 1,255,376,769 Earnings per share – basic $ 9.70 $ 7.02 $ 2.07 Earnings per share – diluted $ 9.66 $ 6.93 $ 2.06 Potentially dilutive securities: Outstanding stock options and unvested stock awards 25,652 148,537 16,616 SoftBank contingent consideration (1) — — 48,751,557 Ka’ena Acquisition contingent consideration (3) 750,162 — — (1) Represents the weighted-average number of shares (“SoftBank Specified Shares”) that were contingently issuable from the Merger date of April 1, 2020, pursuant to a letter agreement dated February 20, 2020, between T-Mobile, SoftBank and DT (the “Letter Agreement”). (2) During 2023, the SoftBank Specified Shares were issued and included in our calculations of basic and diluted weighted-average shares outstanding as further described below. (3) The weighted-average number of shares contingently issuable related to the Ka’ena Acquisition earnout consideration (“Ka’ena Contingent Shares”) are included in potentially dilutive securities based on the maximum number of shares contingently issuable for the earnout and the 20 trading day volume-weighted average price as of December 31, 2024. No Ka’ena Contingent Shares were outstanding during the year ended December 31, 2024, as the threshold specified performance indicators had not been achieved.

Leases (Tables)

Leases (Tables)	12 Months Ended
	Dec. 31, 2024
Leases [Abstract]
Schedule of Components of Lease Expense	The components of lease expense were as follows: Year Ended December 31, (in millions) 2024 2023 2022 Operating lease expense $ 4,787 $ 4,987 $ 6,514 Financing lease expense: Amortization of right-of-use assets 787 684 733 Interest on lease liabilities 111 79 68 Total financing lease expense 898 763 801 Variable lease expense 279 411 484 Total lease expense $ 5,964 $ 6,161 $ 7,799
Schedule of Information Relating to Lease Term and Discount Rate	Information relating to the lease term and discount rate is as follows: Year Ended December 31, 2024 2023 2022 Weighted-Average Remaining Lease Term (Years) Operating leases 8 9 10 Financing leases 2 2 2 Weighted-Average Discount Rate Operating leases 4.4 % 4.3 % 4.1 % Financing leases 5.3 % 4.6 % 3.2 %
Schedule of Maturity Operating Lease Liabilities	Maturities of lease liabilities as of December 31, 2024, were as follows: (in millions) Operating Leases Finance Leases Twelve Months Ending December 31, 2025 $ 4,491 $ 1,242 2026 4,400 809 2027 4,093 357 2028 3,763 25 2029 3,478 4 Thereafter 15,664 — Total lease payments 35,889 2,437 Less: imputed interest 6,199 111 Total $ 29,690 $ 2,326
Schedule of Maturity Finance Lease Liabilities	Maturities of lease liabilities as of December 31, 2024, were as follows: (in millions) Operating Leases Finance Leases Twelve Months Ending December 31, 2025 $ 4,491 $ 1,242 2026 4,400 809 2027 4,093 357 2028 3,763 25 2029 3,478 4 Thereafter 15,664 — Total lease payments 35,889 2,437 Less: imputed interest 6,199 111 Total $ 29,690 $ 2,326

Restructuring Costs (Tables)

Restructuring Costs (Tables)	12 Months Ended
	Dec. 31, 2024
Restructuring and Related Activities [Abstract]
Schedule of Restructuring Plan Expenses Incurred	The following table summarizes the expenses incurred in connection with our Merger restructuring initiatives: (in millions) Year Ended Year Ended Year Ended Incurred to Date Contract termination costs $ 231 $ 45 $ 4 $ 472 Severance costs 169 3 — 574 Network decommissioning 796 289 91 1,857 Total restructuring plan expenses $ 1,196 $ 337 $ 95 $ 2,903
Schedule of Activity Related to Expenses Incurred and Cash Payments Made	The following table summarizes the expenses incurred in connection with our workforce reduction initiative: (in millions) Year Ended Year Ended Incurred to Date Severance costs (recoveries) $ 462 $ (5) $ 457

Additional Financial Informat_2

Additional Financial Information (Tables)	12 Months Ended
	Dec. 31, 2024
Supplemental Financial Statement Elements [Abstract]
Schedule of Accounts Payable and Accrued Liabilities	Accounts payable and accrued liabilities are summarized as follows: (in millions) December 31, December 31, Accounts payable $ 4,242 $ 5,573 Payroll and related benefits 1,072 1,142 Property and other taxes, including payroll 1,524 1,704 Accrued interest 905 818 Other accrued liabilities 720 1,136 Accounts payable and accrued liabilities $ 8,463 $ 10,373
Schedule of Related Party Transactions	The following table summarizes the impact of significant transactions with DT or its affiliates included in Operating expenses in the Consolidated Statements of Comprehensive Income: Year Ended December 31, (in millions) 2024 2023 2022 Fees incurred for use of the T-Mobile brand $ 80 $ 80 $ 80 International long distance agreement 19 20 25
Schedule of Supplemental Consolidated Statements of Cash Flows Information	The following table summarizes T-Mobile’s supplemental cash flow information: Year Ended December 31, (in millions) 2024 2023 2022 Interest payments, net of amounts capitalized $ 3,683 $ 3,546 $ 3,485 Operating lease payments 5,162 5,062 4,205 Income tax payments 211 149 76 Non-cash investing and financing activities Non-cash beneficial interest obtained in exchange for securitized receivables $ 2,421 $ 3,990 $ 4,192 Change in accounts payable and accrued liabilities for purchases of property and equipment 105 (860) 133 Increase in Tower obligations from contract modification — — 1,158 Operating lease right-of-use assets obtained in exchange for lease obligations 1,741 2,141 7,462 Financing lease right-of-use assets obtained in exchange for lease obligations 1,222 1,224 1,256 Contingent and other deferred consideration related to the Ka’ena Acquisition 218 — —
Schedule of Cash and Cash Equivalents, Including Restricted Cash	Cash and cash equivalents, including restricted cash, presented on our Consolidated Statements of Cash Flows were included on our Consolidated Balance Sheets as follows: (in millions) December 31, December 31, Cash and cash equivalents $ 5,409 $ 5,135 Restricted cash (included in Other current assets) 231 101 Restricted cash (included in Other assets) 73 71 Cash and cash equivalents, including restricted cash $ 5,713 $ 5,307
Schedule of Restricted Cash	Cash and cash equivalents, including restricted cash, presented on our Consolidated Statements of Cash Flows were included on our Consolidated Balance Sheets as follows: (in millions) December 31, December 31, Cash and cash equivalents $ 5,409 $ 5,135 Restricted cash (included in Other current assets) 231 101 Restricted cash (included in Other assets) 73 71 Cash and cash equivalents, including restricted cash $ 5,713 $ 5,307

Summary of Significant Accoun_3

Summary of Significant Accounting Policies (Details) $ in Millions, € in Billions	12 Months Ended
	Dec. 31, 2024 USD ($) reporting_unit	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 13, 2024 USD ($)	May 08, 2024 EUR (€)	Sep. 06, 2023 USD ($)	Sep. 08, 2022 USD ($)	Sep. 06, 2022 USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Number of reporting units | reporting_unit	1
Other finance liabilities | €					€ 2
Term of contract	1 month
Federal Universal Service Fund and other fees	$ 386	$ 317	$ 185
Financing option, devices and accessories, interest rate (percent)	0%
Financing option, devices and accessories, payment period	24 months
Average amortization period, deferred contract costs (in months)	24 months
(Gain) loss on disposal group held for sale	$ 0	25	(1,087)
Impairment expense	0	0	477
Advertising expense	3,100	2,500	2,300
2022 Stock Repurchase Program
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Stock repurchase program, authorized amount							$ 14,000
2023-2024 Stockholder Return Program
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Stock repurchase program, authorized amount						$ 19,000
2025 Stockholder Return Program
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Stock repurchase program, authorized amount				$ 14,000
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Business Contact
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
(Gain) loss on disposal group held for sale			1,100
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Wireline Business
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Transaction fees payable								$ 700
Monthly installments due in year one								350
Monthly installments due thereafter								$ 350
Monthly installments (in period)								42 months
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Wireline Business | Other current liabilities
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Disposal group, fees payable	100	183
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Wireline Business | Other long-term liabilities
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Disposal group, fees payable	$ 168	$ 255
Sprint
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total term of agreement	30 years
Sprint | Wireline Business
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Impairment expense			$ 477
Sprint | Spectrum Licenses
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Fixed period	15 years
Minimum | Sprint
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Agreements with educational and certain non-profit institutions, term	5 years
Minimum | EIP Securitization Arrangement
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Equipment installment plan, maximum payment term	24 months
Maximum | Sprint
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Agreements with educational and certain non-profit institutions, term	10 years

Business Combinations - Narrati

Business Combinations - Narrative (Details) $ in Millions						3 Months Ended		12 Months Ended
	Dec. 20, 2024 USD ($)	May 24, 2024 USD ($)	May 01, 2024 USD ($) shares	Apr. 30, 2024 USD ($)	Mar. 09, 2023 USD ($)	Jun. 30, 2025 USD ($) tower_site	Dec. 31, 2024 USD ($)	Dec. 31, 2024 USD ($)
Business Acquisition [Line Items]
Estimated incremental future minimum lease payments							$ 24	$ 24
Ka Ena Corporation
Business Acquisition [Line Items]
Preliminary goodwill from the Ka’ena Acquisition in 2024			$ 771					771
Ka Ena Corporation | Merger And Unit Purchase Agreement
Business Acquisition [Line Items]
Business acquisition, outstanding (percent)					100%
Total consideration transferred					$ 1,350
Business acquisition, cash acquired (percent)					39%
Business acquisition, common shares acquired (percent)					61%
Ka Ena Corporation | Merger and Unit Purchase Agreement, Amendment No. 1
Business Acquisition [Line Items]
Total consideration transferred			1,141
Upfront payment transferred			$ 420
Upfront payment, number of common shares transferred (in shares) | shares			3,264,952
Upfront payment, transferred shares value				$ 536
Fair value of upfront payment, net			$ 956
Fair value of deferred consideration			27
Upfront Payment, customary adjustments							17
Additional upfront payment to be paid			420
Business combination, potential earnout payment			251
Business combination, contingent consideration liability			191
Business combination, potential earnout payment for services			169
Business combination contingent consideration liability, other long-term liabilities							202	202
Business combination, liability, post-acquisition services							$ 80	$ 80
Goodwill expected to be tax deductible			90
Ka Ena Corporation | Merger and Unit Purchase Agreement, Amendment No. 1 | Customer Relationships
Business Acquisition [Line Items]
Finite-lived, fair value			$ 545
Weighted average useful life			6 years
Ka Ena Corporation | Merger and Unit Purchase Agreement, Amendment No. 1 | Tradenames
Business Acquisition [Line Items]
Finite-lived, fair value			$ 70
Weighted average useful life			8 years
Ka Ena Corporation | Merger and Unit Purchase Agreement, Amendment No. 1 | Other Intangible Assets
Business Acquisition [Line Items]
Finite-lived, fair value			$ 125
Weighted average useful life			4 years
UScellular Wireless Assets Operations | Purchase Agreement
Business Acquisition [Line Items]
Payments for asset acquisition		$ 4,400
Asset acquisition, maximum transferred liabilities incurred		$ 2,000
UScellular Wireless Assets Operations | Purchase Agreement | Forecast
Business Acquisition [Line Items]
Lease space agreement term (years)						15 years
Number of towers retained | tower_site						2,100
Number of towers to be extended tenancy term | tower_site						600
Estimated incremental future minimum lease payments						$ 1,400
Vistar Media Inc.
Business Acquisition [Line Items]
Business acquisition, outstanding (percent)	100%
Total consideration transferred	$ 625

Business Combinations - Schedul

Business Combinations - Schedule of Fair Value of Consideration Transferred (Details) - Ka Ena Corporation - Merger and Unit Purchase Agreement, Amendment No. 1 $ in Millions	May 01, 2024 USD ($)
Business Acquisition [Line Items]
Fair value of T-Mobile common stock issued to Ka’ena stockholders related to the adjusted upfront payment	$ 527
Fair value of cash paid to Ka’ena stockholders related to the adjusted upfront payment	396
Fair value of contingent consideration	191
Fair value of deferred consideration	27
Total fair value of consideration exchanged	$ 1,141

Business Combinations - Sched_2

Business Combinations - Schedule of Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Millions	May 01, 2024	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Business Acquisition [Line Items]
Goodwill		$ 13,005	$ 12,234	$ 12,234
Ka Ena Corporation | Merger and Unit Purchase Agreement, Amendment No. 1
Business Acquisition [Line Items]
Cash and cash equivalents	$ 24
Accounts receivable	34
Inventory	3
Prepaid expenses	5
Other current assets	10
Property and equipment	1
Operating lease right-of-use assets	2
Goodwill	771
Other intangible assets	740
Other assets	51
Total assets acquired	1,641
Accounts payable and accrued liabilities	42
Deferred revenue	297
Short-term operating lease liabilities	1
Deferred tax liabilities	86
Operating lease liabilities	2
Other long-term liabilities	72
Total liabilities assumed	500
Total consideration transferred	$ 1,141

Joint Ventures (Details)

Joint Ventures (Details) - Forecast - USD ($) $ in Millions	3 Months Ended	12 Months Ended	24 Months Ended
	Jun. 30, 2025	Dec. 31, 2025	Dec. 31, 2028
Lumos
Joint Venture [Line Items]
Expected investment to acquire interest in joint venture	$ 950		$ 500
Ownership interest in joint venture (percent)	50%
Metronet
Joint Venture [Line Items]
Expected investment to acquire interest in joint venture		$ 4,900
Ownership interest in joint venture (percent)		50%

Receivables and Related Allow_3

Receivables and Related Allowance for Credit Losses - Schedule of Equipment Installment Plan Receivables (Details) $ in Millions	12 Months Ended
	Dec. 31, 2024 USD ($) segment class	Dec. 31, 2023 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Portfolio segments | segment	2
Customer classes | class	2
EIP receivables, gross	$ 7,402	$ 7,271
Unamortized imputed discount	(524)	(505)
EIP receivables, net of unamortized imputed discount	6,878	6,766
Allowance for credit losses	(290)	(268)
EIP receivables, net of allowance for credit losses and imputed discount	6,588	6,498
Equipment installment plan receivables, net of allowance for credit losses and imputed discount
Accounts, Notes, Loans and Financing Receivable [Line Items]
EIP receivables, net of allowance for credit losses and imputed discount	4,379	4,456
Equipment installment plan receivables due after one year, net of allowance for credit losses and imputed discount
Accounts, Notes, Loans and Financing Receivable [Line Items]
EIP receivables, net of allowance for credit losses and imputed discount	$ 2,209	$ 2,042
EIP Receivables Allowance
Accounts, Notes, Loans and Financing Receivable [Line Items]
Weighted average effective imputed interest rate	11.10%	10.60%

Receivables and Related Allow_4

Receivables and Related Allowance for Credit Losses - Schedule of Equipment Installment Plan Receivables by Credit Category (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Financing Receivable, Credit Quality Indicator [Line Items]
EIP receivables, net of unamortized imputed discount	$ 6,878	$ 6,766
Prime
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in 2024	4,244
Originated in 2023	1,133
Originated prior to 2023	19
EIP receivables, net of unamortized imputed discount	5,396
Subprime
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in 2024	1,172
Originated in 2023	303
Originated prior to 2023	7
EIP receivables, net of unamortized imputed discount	1,482
Current - 30 days past due
Financing Receivable, Credit Quality Indicator [Line Items]
EIP receivables, net of unamortized imputed discount	6,747
Current - 30 days past due | Prime
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in 2024	4,213
Originated in 2023	1,118
Originated prior to 2023	18
EIP receivables, net of unamortized imputed discount	5,349
Current - 30 days past due | Subprime
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in 2024	1,109
Originated in 2023	283
Originated prior to 2023	6
EIP receivables, net of unamortized imputed discount	1,398
31 - 60 days past due
Financing Receivable, Credit Quality Indicator [Line Items]
EIP receivables, net of unamortized imputed discount	55
31 - 60 days past due | Prime
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in 2024	15
Originated in 2023	6
Originated prior to 2023	0
EIP receivables, net of unamortized imputed discount	21
31 - 60 days past due | Subprime
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in 2024	27
Originated in 2023	7
Originated prior to 2023	0
EIP receivables, net of unamortized imputed discount	34
61 - 90 days past due
Financing Receivable, Credit Quality Indicator [Line Items]
EIP receivables, net of unamortized imputed discount	38
61 - 90 days past due | Prime
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in 2024	9
Originated in 2023	4
Originated prior to 2023	0
EIP receivables, net of unamortized imputed discount	13
61 - 90 days past due | Subprime
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in 2024	19
Originated in 2023	6
Originated prior to 2023	0
EIP receivables, net of unamortized imputed discount	25
More than 90 days past due
Financing Receivable, Credit Quality Indicator [Line Items]
EIP receivables, net of unamortized imputed discount	38
More than 90 days past due | Prime
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in 2024	7
Originated in 2023	5
Originated prior to 2023	1
EIP receivables, net of unamortized imputed discount	13
More than 90 days past due | Subprime
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in 2024	17
Originated in 2023	7
Originated prior to 2023	1
EIP receivables, net of unamortized imputed discount	$ 25

Receivables and Related Allow_5

Receivables and Related Allowance for Credit Losses - Schedule of Write Offs Net of Recoveries (Details) $ in Millions	12 Months Ended
	Dec. 31, 2024 USD ($)
Write-offs
Originated in 2024	$ 201
Originated in 2023	309
Originated prior to 2023	68
Total	$ 578

Receivables and Related Allow_6

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	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for credit losses and imputed discount, beginning of period	$ 934	$ 978	$ 776
Bad debt expense	1,192	898	1,026
Write-offs	(1,155)	(964)	(930)
Change in imputed discount on short-term and long-term EIP receivables	199	220	262
Impact on the imputed discount from sales of EIP receivables	(180)	(198)	(156)
Allowance for credit losses and imputed discount, end of period	990	934	978
Accounts Receivable Allowance
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for credit losses and imputed discount, beginning of period	161	167	146
Bad debt expense	592	440	433
Write-offs	(577)	(446)	(412)
Allowance for credit losses and imputed discount, end of period	176	161	167
EIP Receivables Allowance
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for credit losses and imputed discount, beginning of period	773	811	630
Bad debt expense	600	458	593
Write-offs	(578)	(518)	(518)
Change in imputed discount on short-term and long-term EIP receivables	199	220	262
Impact on the imputed discount from sales of EIP receivables	(180)	(198)	(156)
Allowance for credit losses and imputed discount, end of period	$ 814	$ 773	$ 811

Sales of Certain Receivables -

Sales of Certain Receivables - Schedule of Variable Interest Entities - EIP (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Variable Interest Entity [Line Items]
Other current assets	$ 1,853	$ 2,352
Other assets	4,325	4,229
Other current liabilities	1,965	1,296
EIP Securitization Arrangement
Variable Interest Entity [Line Items]
Other current assets	1	348
Other assets	0	103
Other current liabilities	81	0
Other long-term liabilities	32	0
Revolving receivables facility, maximum borrowing capacity	1,300	1,300
Factoring Arrangement | Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Other current assets	0	209
Other current liabilities	328	$ 373
Revolving receivables facility, maximum borrowing capacity	$ 950

Sales of Certain Receivables _2

Sales of Certain Receivables - Schedule of Variable Interest Entities (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Variable Interest Entity [Line Items]
Other current assets	$ 1,853	$ 2,352
Other current liabilities	1,965	1,296
Variable Interest Entity, Not Primary Beneficiary | Factoring Arrangement
Variable Interest Entity [Line Items]
Revolving receivables facility, outstanding borrowings	775	775
Other current assets	0	209
Other current liabilities	$ 328	$ 373

Sales of Certain Receivables _3

Sales of Certain Receivables - Schedule of Factoring Arrangement (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Nov. 01, 2024
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]
Other current assets	$ 1,853	$ 2,352
Other assets	4,325	4,229
Other current liabilities	1,965	1,296
Other long-term liabilities	4,000	3,929
Of which:
Losses from sales of receivables	62	165	$ 214
Variable Interest Entity, Primary Beneficiary | Service Receivable Sale Arrangement
Of which:
Gross receivables				$ 193
Variable Interest Entity, Primary Beneficiary | Service Receivable Sale Arrangement | Collateral Pledged
Of which:
Gross receivables	286
Factoring and EIP Securitization Arrangement | Variable Interest Entity, Primary Beneficiary
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]
Derecognized net service accounts receivable and EIP receivables	1,616	2,388
Other current assets	1	557
Other assets	0	103
Other current liabilities	409	373
Other long-term liabilities	32	0
Net cash proceeds since inception	1,468	1,583
Of which:
Change in net cash proceeds during the year-to-date period	(115)	(114)
Net cash proceeds funded by reinvested collections	1,583	1,697
Losses from sales of receivables	62	165	$ 214
Factoring and EIP Securitization Arrangement | Variable Interest Entity, Primary Beneficiary | Level 3 | Carrying Amount
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]
Carrying amounts of deferred purchase price assets	148	658
Factoring and EIP Securitization Arrangement | Variable Interest Entity, Primary Beneficiary | EIP Sale Arrangement
Of which:
Gross EIP receivables				$ 604
Factoring and EIP Securitization Arrangement | Variable Interest Entity, Primary Beneficiary | EIP Sale Arrangement | Collateral Pledged
Of which:
Gross EIP receivables	505
Factoring and EIP Securitization Arrangement | Variable Interest Entity, Primary Beneficiary | Other current assets - of which, deferred purchase price
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]
Carrying amounts of deferred purchase price assets	0	555
Factoring and EIP Securitization Arrangement | Variable Interest Entity, Primary Beneficiary | Other long-term assets - of which, deferred purchase price
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]
Carrying amounts of deferred purchase price assets	0	103
Factoring and EIP Securitization Arrangement | Variable Interest Entity, Primary Beneficiary | Other current liabilities - of which, deferred purchase price
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]
Carrying amounts of deferred purchase price assets	116	0
Factoring and EIP Securitization Arrangement | Variable Interest Entity, Primary Beneficiary | Other long-term liabilities - of which, deferred purchase price
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]
Carrying amounts of deferred purchase price assets	$ 32	$ 0

Property and Equipment - Schedu

Property and Equipment - Schedule of Components of Property and Equipment, Excluding Amounts Transferred to Held for Sale (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Property, Plant and Equipment [Line Items]
Accumulated depreciation and amortization	$ (56,367)	$ (58,481)
Property and equipment, net	38,533	40,432
Depreciation expense	12,100	12,000	$ 12,700
Depreciation expense for lease devices	54	170	1,100
Capitalized interest	34	104	$ 61
Land
Property, Plant and Equipment [Line Items]
Property, plant and equipment	69	72
Buildings and equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment	4,377	4,465
Wireless communications systems
Property, Plant and Equipment [Line Items]
Property, plant and equipment	65,778	65,628
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment	2,588	2,489
Capitalized software
Property, Plant and Equipment [Line Items]
Property, plant and equipment	18,566	22,573
Leased wireless devices
Property, Plant and Equipment [Line Items]
Property, plant and equipment	145	400
Construction in progress
Property, Plant and Equipment [Line Items]
Property, plant and equipment	$ 3,377	$ 3,286
Maximum | Buildings and equipment
Property, Plant and Equipment [Line Items]
Useful life (in years)	30 years
Maximum | Wireless communications systems
Property, Plant and Equipment [Line Items]
Useful life (in years)	20 years
Maximum | Leasehold improvements
Property, Plant and Equipment [Line Items]
Useful life (in years)	10 years
Maximum | Capitalized software
Property, Plant and Equipment [Line Items]
Useful life (in years)	8 years
Maximum | Leased wireless devices
Property, Plant and Equipment [Line Items]
Useful life (in years)	16 months

Property and Equipment - Sche_2

Property and Equipment - Schedule of Asset Retirement Obligation (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Asset retirement obligations, beginning of year	$ 1,716	$ 1,852
Liabilities incurred	21	28
Liabilities settled	(307)	(399)
Accretion expense	69	71
Changes in estimated cash flows	36	164
Asset retirement obligations, end of period	1,535	1,716
Classified on the consolidated balance sheets	1,535	1,716
Asset retirement costs capitalized, net	423	462
Other current liabilities
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Asset retirement obligations, beginning of year	133
Asset retirement obligations, end of period	109	133
Classified on the consolidated balance sheets	109	133
Other long-term liabilities
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Asset retirement obligations, beginning of year	1,583
Asset retirement obligations, end of period	1,426	1,583
Classified on the consolidated balance sheets	$ 1,426	$ 1,583

Goodwill, Spectrum License Tr_3

Goodwill, Spectrum License Transactions and Other Intangible Assets - Schedule of Changes in Carrying Amount of Goodwill (Details) - USD ($) $ in Millions		12 Months Ended
	May 01, 2024	Dec. 31, 2024	Dec. 31, 2022
Goodwill [Roll Forward]
Beginning balance		$ 12,234
Ending balance		13,005
Accumulated impairment losses		10,984	$ 10,984
Ka Ena Corporation
Goodwill [Roll Forward]
Preliminary goodwill from the Ka’ena Acquisition in 2024	$ 771	$ 771

Goodwill, Spectrum License Tr_4

Goodwill, Spectrum License Transactions and Other Intangible Assets - Schedule of Spectrum Licenses (Details) - Licensing Agreements - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Indefinite-lived Intangible Assets [Roll Forward]
Beginning balance	$ 96,707	$ 95,798	$ 92,606
Spectrum license acquisitions	4,822	103	3,152
Spectrum licenses transferred to held for sale	(1,024)	(2)	(64)
Costs to clear spectrum	53	808	104
Ending balance	$ 100,558	$ 96,707	$ 95,798

Goodwill, Spectrum License Tr_5

Goodwill, Spectrum License Transactions and Other Intangible Assets - Narrative (Details) $ in Millions

1 Months Ended

12 Months Ended

Jan. 13, 2025 USD ($)

Dec. 31, 2024 USD ($)

Dec. 06, 2024 USD ($)

Aug. 05, 2024 USD ($)

Oct. 15, 2023 USD ($)

Sep. 12, 2023 USD ($)

Aug. 25, 2023 USD ($)

Mar. 30, 2023 USD ($) tranche

Aug. 08, 2022 USD ($)

Jul. 01, 2020 USD ($)

Sep. 30, 2022 USD ($) license

Jun. 30, 2022 USD ($)

Jan. 31, 2022 USD ($) license

Dec. 31, 2024 USD ($)

Dec. 31, 2023 USD ($)

Dec. 31, 2022 USD ($)

Oct. 25, 2023 USD ($)

Goodwill [Line Items]

Purchase of spectrum licenses

$ 3,471

$ 1,010

$ 3,331

Spectrum licenses

$ 100,558

100,558

96,707

Amortization expense for intangible assets

857

888

1,200

Spectrum Licenses | N77 License Co LLC

Goodwill [Line Items]

Spectrum licenses

2,700

2,700

2,700

T-Mobile and Sprint | Spectrum Licenses | DISH

Goodwill [Line Items]

Payments for asset acquisition

$ 3,600

$ 3,600

Non-refundable extension fee payable

100

Termination fee payable

72

Terminate and retain the extension fee

$ 100

$ 100

T-Mobile and Sprint | Spectrum Licenses | DISH | Selling, General and Administrative Expenses

Goodwill [Line Items]

Extension fee paid

100

Auction 108

Goodwill [Line Items]

Aggregate purchase price

$ 304

Licensing Agreements | Spectrum Exchange Transactions

Goodwill [Line Items]

Gain (loss) on spectrum exchange transactions

202

$ 0

$ 0

Licensing Agreements | Spectrum Exchange Transactions, Third-Party License Agreements

Goodwill [Line Items]

Gain (loss) on spectrum exchange transactions

137

Licensing Agreements | Channel 51 License Co, LLC and LB License Co, LLC

Goodwill [Line Items]

Consideration transferred

$ 541

$ 2,400

Total cash consideration

$ 3,500

$ 3,500

Number of tranches licenses | tranche

2

Closing period after regulatory approval

180 days

Payment period after closing

40 days

Licensing Agreements | Channel 51 License Co, LLC and LB License Co, LLC | Second Tranche

Goodwill [Line Items]

Total cash consideration

$ 604

$ 1,100

Licensing Agreements | Comcast Corporation

Goodwill [Line Items]

License purchase agreement, minimum period before termination allowed

2 years

Licensing Agreements | Comcast Corporation | Minimum

Goodwill [Line Items]

Total cash consideration

$ 1,200

Licensing Agreements | Comcast Corporation | Minimum | Subsequent Event

Goodwill [Line Items]

Total cash consideration

$ 1,200

Licensing Agreements | Comcast Corporation | Maximum

Goodwill [Line Items]

Total cash consideration

3,300

Licensing Agreements | Comcast Corporation | Maximum | Subsequent Event

Goodwill [Line Items]

Total cash consideration

$ 3,400

Licensing Agreements | Non-Cash Spectrum License Acquisitions | Spectrum Exchange Transactions

Goodwill [Line Items]

Consideration transferred, exchange of licenses

1,200

Licensing Agreements | Non-Cash Spectrum License Acquisitions | Spectrum Exchange Transactions, Third-Party License Agreements

Goodwill [Line Items]

Consideration transferred, exchange of licenses

$ 985

Licensing Agreements | Spectrum Licenses | Channel 51 License Co, LLC and LB License Co, LLC

Goodwill [Line Items]

Total cash consideration

$ 3,500

Licensing Agreements | Auction 108

Goodwill [Line Items]

Number of licenses | license

7,156

Purchase of spectrum licenses

$ 239

$ 65

Licensing Agreements | Auction 110

Goodwill [Line Items]

Number of licenses | license

199

Aggregate purchase price

$ 2,900

Optional Sale Licenses | Comcast Corporation | Minimum

Goodwill [Line Items]

Total cash consideration

$ 2,100

Goodwill, Spectrum License Tr_6

Goodwill, Spectrum License Transactions and Other Intangible Assets - Schedule of Other Intangible Assets and Estimated Aggregate Future Amortization Expense (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Finite-Lived Intangible Assets [Line Items]
Gross Amount	$ 7,633	$ 6,900
Accumulated Amortization	(5,121)	(4,282)
Net Amount	2,512	2,618
Estimated Future Amortization
2025	749
2026	571
2027	404
2028	253
2029	171
Thereafter	364
Net Amount	2,512	2,618
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross Amount	5,427	4,883
Accumulated Amortization	(4,123)	(3,451)
Net Amount	1,304	1,432
Estimated Future Amortization
Net Amount	$ 1,304	1,432
Customer relationships | Maximum
Finite-Lived Intangible Assets [Line Items]
Intangible assets, useful life	8 years
Reacquired rights
Finite-Lived Intangible Assets [Line Items]
Gross Amount	$ 770	770
Accumulated Amortization	(323)	(231)
Net Amount	447	539
Estimated Future Amortization
Net Amount	$ 447	539
Reacquired rights | Maximum
Finite-Lived Intangible Assets [Line Items]
Intangible assets, useful life	9 years
Tradenames and patents
Finite-Lived Intangible Assets [Line Items]
Gross Amount	$ 338	208
Accumulated Amortization	(157)	(134)
Net Amount	181	74
Estimated Future Amortization
Net Amount	$ 181	74
Tradenames and patents | Maximum
Finite-Lived Intangible Assets [Line Items]
Intangible assets, useful life	19 years
Favorable spectrum leases
Finite-Lived Intangible Assets [Line Items]
Gross Amount	$ 620	686
Accumulated Amortization	(169)	(148)
Net Amount	451	538
Estimated Future Amortization
Net Amount	$ 451	538
Favorable spectrum leases | Maximum
Finite-Lived Intangible Assets [Line Items]
Intangible assets, useful life	27 years
Other
Finite-Lived Intangible Assets [Line Items]
Gross Amount	$ 478	353
Accumulated Amortization	(349)	(318)
Net Amount	129	35
Estimated Future Amortization
Net Amount	$ 129	$ 35
Other | Maximum
Finite-Lived Intangible Assets [Line Items]
Intangible assets, useful life	10 years

Fair Value Measurements - Narra

Fair Value Measurements - Narrative (Details) $ in Millions, € in Billions		12 Months Ended
	May 08, 2024 EUR (€)	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Derivative [Line Items]
Denominated debt issued | €	€ 2
Accumulated other comprehensive loss		$ 857	$ 964
Interest Expense
Derivative [Line Items]
Amount amortized from AOCI into interest expense		236	219	$ 203
Amount expected to be amortized from AOCI into interest expense over next 12 months		254
Cross-Currency Swap
Derivative [Line Items]
Amount amortized from AOCI into interest expense		79
Cross-Currency Swap | Cash Flow Hedging | 3.550% Senior Notes due 2029 | Senior Notes
Derivative [Line Items]
Derivative maturity term	5 years
Cross-Currency Swap | Cash Flow Hedging | 3.700% Senior Notes due 2032 | Senior Notes
Derivative [Line Items]
Derivative maturity term	8 years
Cross-Currency Swap | Cash Flow Hedging | 3.850% Senior Notes due 2036 | Senior Notes
Derivative [Line Items]
Derivative maturity term	12 years
Interest Rate Contract
Derivative [Line Items]
Accumulated other comprehensive loss		$ 960	$ 1,100

Fair Value Measurements - Sched

Fair Value Measurements - Schedule of Pretax Cross Currency Swaps (Details) - Cross-Currency Swap $ in Millions	12 Months Ended
	Dec. 31, 2024 USD ($)
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Pre-tax transaction gain on remeasurement of EUR-denominated debt	$ 79
Amount recognized in Other income (expense), net reclassified from Accumulated other comprehensive loss	(79)
Amount recognized in Accumulated other comprehensive loss reclassified to Other income (expense), net	79
Loss associated with the change in fair value of cross-currency swaps recognized in Accumulated other comprehensive loss	$ (58)

Fair Value Measurements - Sch_2

Fair Value Measurements - Schedule of Carrying Values and Fair Values of Long-term Debt (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Carrying Amount | Senior Notes | Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	$ 71,783	$ 70,493
Carrying Amount | Senior Notes | Third Party (EUR-denominated) | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	2,058	0
Carrying Amount | Senior Notes | Related Party | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	1,497	1,496
Carrying Amount | Senior Secured Notes | Third Party | Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	1,361	2,281
Carrying Amount | ABS Notes | Related Party | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	1,566	748
Fair Value | Senior Notes | Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	65,631	65,962
Fair Value | Senior Notes | Third Party (EUR-denominated) | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	2,125	0
Fair Value | Senior Notes | Related Party | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	1,491	1,499
Fair Value | Senior Secured Notes | Third Party | Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	1,330	2,207
Fair Value | ABS Notes | Related Party | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	$ 1,570	$ 748

Debt - Schedule of Debt (Detail

Debt - Schedule of Debt (Details) $ in Millions, € in Billions	Dec. 31, 2024 USD ($)	May 08, 2024 EUR (€)	Dec. 31, 2023 USD ($)
Debt Instrument [Line Items]
Other finance liabilities | €		€ 2
Debt issuance costs and consent fees	$ (278)		$ (263)
Total debt	78,265		75,018
Total long-term debt	74,197		71,399
Affiliates
Debt Instrument [Line Items]
Total long-term debt	1,497		1,496
Nonrelated Party
Debt Instrument [Line Items]
Unamortized premium on debt to third parties	775		1,011
Unamortized discount on debt to third parties	(223)		(223)
Total long-term debt	72,700		69,903
Senior Notes | Nonrelated Party
Debt Instrument [Line Items]
Less: Current portion of Senior Notes	4,068		3,619
7.125% Senior Notes due 2024
Debt Instrument [Line Items]
Other finance liabilities	$ 0		2,500
3.500% Senior Notes due 2025
Debt Instrument [Line Items]
Interest rate, stated percentage	3.50%
Other finance liabilities	$ 3,000		3,000
4.738% Series 2018-1 A-1 Notes due 2025
Debt Instrument [Line Items]
Other finance liabilities	$ 131		656
4.738% Series 2018-1 A-1 Notes due 2025 | Senior Notes
Debt Instrument [Line Items]
Interest rate, stated percentage	4.738%
7.625% Senior Notes due 2025
Debt Instrument [Line Items]
Other finance liabilities	$ 0		1,500
1.500% Senior Notes due 2026
Debt Instrument [Line Items]
Interest rate, stated percentage	1.50%
Other finance liabilities	$ 1,000		1,000
2.250% Senior Notes due 2026
Debt Instrument [Line Items]
Interest rate, stated percentage	2.25%
Other finance liabilities	$ 1,800		1,800
2.625% Senior Notes due 2026
Debt Instrument [Line Items]
Interest rate, stated percentage	2.625%
Other finance liabilities	$ 1,200		1,200
7.625% Senior Notes due 2026
Debt Instrument [Line Items]
Other finance liabilities	$ 1,500		1,500
3.750% Senior Notes due 2027
Debt Instrument [Line Items]
Interest rate, stated percentage	3.75%
Other finance liabilities	$ 4,000		4,000
5.375% Senior Notes due 2027
Debt Instrument [Line Items]
Interest rate, stated percentage	5.375%
Other finance liabilities	$ 500		500
2.050% Senior Notes due 2028
Debt Instrument [Line Items]
Interest rate, stated percentage	2.05%
Other finance liabilities	$ 1,750		1,750
4.750% Senior Notes due 2028
Debt Instrument [Line Items]
Interest rate, stated percentage	4.75%
Other finance liabilities	$ 1,500		1,500
4.750% Senior Notes due 2028 | Affiliates
Debt Instrument [Line Items]
Interest rate, stated percentage	4.75%
Other finance liabilities	$ 1,500		1,500
4.800% Senior Notes due 2028
Debt Instrument [Line Items]
Interest rate, stated percentage	4.80%
Other finance liabilities	$ 900		900
4.910% Class A Senior ABS Notes due 2028
Debt Instrument [Line Items]
Interest rate, stated percentage	4.91%
Other finance liabilities	$ 570		750
4.950% Senior Notes due 2028
Debt Instrument [Line Items]
Interest rate, stated percentage	4.95%
Other finance liabilities	$ 1,000		1,000
5.152% Series 2018-1 A-2 Notes due 2028
Debt Instrument [Line Items]
Other finance liabilities	1,194		1,562
6.875% Senior Notes due 2028
Debt Instrument [Line Items]
Other finance liabilities	$ 2,475		2,475
2.400% Senior Notes due 2029
Debt Instrument [Line Items]
Interest rate, stated percentage	2.40%
Other finance liabilities	$ 500		500
2.625% Senior Notes due 2029
Debt Instrument [Line Items]
Interest rate, stated percentage	2.625%
Other finance liabilities	$ 1,000		1,000
3.375% Senior Notes due 2029
Debt Instrument [Line Items]
Interest rate, stated percentage	3.375%
Other finance liabilities	$ 2,350		2,350
3.550% Senior Notes due 2029 (EUR-denominated)
Debt Instrument [Line Items]
Interest rate, stated percentage	3.55%
Other finance liabilities	$ 621		0
4.200% Senior Notes due 2029
Debt Instrument [Line Items]
Interest rate, stated percentage	4.20%
Other finance liabilities	$ 700		0
4.200% Senior Notes due 2029 | Senior Notes
Debt Instrument [Line Items]
Interest rate, stated percentage	4.20%
4.250% Class A Senior ABS Notes due 2029
Debt Instrument [Line Items]
Interest rate, stated percentage	4.25%
Other finance liabilities	$ 500		0
4.850% Senior Notes due 2029
Debt Instrument [Line Items]
Interest rate, stated percentage	4.85%
Other finance liabilities	$ 1,000		0
4.850% Senior Notes due 2029 | Senior Notes
Debt Instrument [Line Items]
Interest rate, stated percentage	4.85%
5.050% Class A Senior ABS Notes due 2029
Debt Instrument [Line Items]
Interest rate, stated percentage	5.05%
Other finance liabilities	$ 500		0
3.875% Senior Notes due 2030
Debt Instrument [Line Items]
Interest rate, stated percentage	3.875%
Other finance liabilities	$ 7,000		7,000
2.250% Senior Notes due 2031
Debt Instrument [Line Items]
Interest rate, stated percentage	2.25%
Other finance liabilities	$ 1,000		1,000
2.550% Senior Notes due 2031
Debt Instrument [Line Items]
Interest rate, stated percentage	2.55%
Other finance liabilities	$ 2,500		2,500
2.875% Senior Notes due 2031
Debt Instrument [Line Items]
Interest rate, stated percentage	2.875%
Other finance liabilities	$ 1,000		1,000
3.500% Senior Notes due 2031
Debt Instrument [Line Items]
Interest rate, stated percentage	3.50%
Other finance liabilities	$ 2,450		2,450
2.700% Senior Notes due 2032
Debt Instrument [Line Items]
Interest rate, stated percentage	2.70%
Other finance liabilities	$ 1,000		1,000
3.700% Senior Notes due 2032 (EUR-denominated)
Debt Instrument [Line Items]
Interest rate, stated percentage	3.70%
Other finance liabilities	$ 777		0
8.750% Senior Notes due 2032
Debt Instrument [Line Items]
Other finance liabilities	$ 2,000		2,000
5.050% Senior Notes due 2033
Debt Instrument [Line Items]
Interest rate, stated percentage	5.05%
Other finance liabilities	$ 2,600		2,600
5.200% Senior Notes due 2033
Debt Instrument [Line Items]
Other finance liabilities	$ 1,250		1,250
5.200% Senior Notes due 2033 | Senior Notes
Debt Instrument [Line Items]
Interest rate, stated percentage	5.20%
5.150% Senior Notes due 2034
Debt Instrument [Line Items]
Interest rate, stated percentage	5.15%
Other finance liabilities	$ 1,250		0
5.150% Senior Notes due 2034 | Senior Notes
Debt Instrument [Line Items]
Interest rate, stated percentage	5.15%
5.750% Senior Notes due 2034
Debt Instrument [Line Items]
Interest rate, stated percentage	5.75%
Other finance liabilities	$ 1,000		1,000
4.700% Senior Notes due 2035
Debt Instrument [Line Items]
Interest rate, stated percentage	4.70%
Other finance liabilities	$ 900		0
4.700% Senior Notes due 2035 | Senior Notes
Debt Instrument [Line Items]
Interest rate, stated percentage	4.70%
3.850% Senior Notes due 2036 (EUR-denominated)
Debt Instrument [Line Items]
Interest rate, stated percentage	3.85%
Other finance liabilities	$ 673		0
4.375% Senior Notes due 2040
Debt Instrument [Line Items]
Interest rate, stated percentage	4.375%
Other finance liabilities	$ 2,000		2,000
3.000% Senior Notes due 2041
Debt Instrument [Line Items]
Interest rate, stated percentage	3%
Other finance liabilities	$ 2,500		2,500
4.500% Senior Notes due 2050
Debt Instrument [Line Items]
Interest rate, stated percentage	4.50%
Other finance liabilities	$ 3,000		3,000
3.300% Senior Notes due 2051
Debt Instrument [Line Items]
Interest rate, stated percentage	3.30%
Other finance liabilities	$ 3,000		3,000
3.400% Senior Notes due 2052
Debt Instrument [Line Items]
Interest rate, stated percentage	3.40%
Other finance liabilities	$ 2,800		2,800
5.650% Senior Notes due 2053
Debt Instrument [Line Items]
Interest rate, stated percentage	5.65%
Other finance liabilities	$ 1,750		1,750
5.750% Senior Notes due 2054
Debt Instrument [Line Items]
Interest rate, stated percentage	5.75%
Other finance liabilities	$ 1,250		1,250
6.000% Senior Notes due 2054
Debt Instrument [Line Items]
Interest rate, stated percentage	6%
Other finance liabilities	$ 1,000		1,000
5.250% Senior Notes due 2055
Debt Instrument [Line Items]
Interest rate, stated percentage	5.25%
Other finance liabilities	$ 900		0
5.250% Senior Notes due 2055 | Senior Notes
Debt Instrument [Line Items]
Interest rate, stated percentage	5.25%
5.500% Senior Notes due 2055
Debt Instrument [Line Items]
Interest rate, stated percentage	5.50%
Other finance liabilities	$ 750		0
5.500% Senior Notes due 2055 | Senior Notes
Debt Instrument [Line Items]
Interest rate, stated percentage	5.50%
3.600% Senior Notes due 2060
Debt Instrument [Line Items]
Interest rate, stated percentage	3.60%
Other finance liabilities	$ 1,700		1,700
5.800% Senior Notes due 2062
Debt Instrument [Line Items]
Interest rate, stated percentage	5.80%
Other finance liabilities	$ 750		$ 750
Sprint | 7.125% Senior Notes due 2024
Debt Instrument [Line Items]
Interest rate, stated percentage	7.125%
Sprint | 4.738% Series 2018-1 A-1 Notes due 2025 | Senior Notes
Debt Instrument [Line Items]
Interest rate, stated percentage	4.738%
Sprint | 7.625% Senior Notes due 2025
Debt Instrument [Line Items]
Interest rate, stated percentage	7.625%
Sprint | 7.625% Senior Notes due 2026
Debt Instrument [Line Items]
Interest rate, stated percentage	7.625%
Sprint | 5.152% Series 2018-1 A-2 Notes due 2028 | Senior Notes
Debt Instrument [Line Items]
Interest rate, stated percentage	5.152%
Sprint | 6.875% Senior Notes due 2028
Debt Instrument [Line Items]
Interest rate, stated percentage	6.875%
Sprint | 8.750% Senior Notes due 2032
Debt Instrument [Line Items]
Interest rate, stated percentage	8.75%

Debt - Narrative (Details)

Debt - Narrative (Details)		12 Months Ended
	Apr. 01, 2020 USD ($) instrument	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Jan. 31, 2025 USD ($)	Jul. 25, 2023 USD ($)
Debt Instrument [Line Items]
Effective interest rate		4.10%	4%
Weighted-average debt outstanding during period		$ 78,300,000,000	$ 75,400,000,000
Carrying value		78,265,000,000	75,018,000,000
Short-term debt		4,068,000,000	3,619,000,000
Letters of credit, amount outstanding		152,000,000	238,000,000
Spectrum Financing Special Purpose Entity
Debt Instrument [Line Items]
Lease payments (per month)	$ 165,000,000
Sprint
Debt Instrument [Line Items]
Total outstanding obligation		1,300,000,000	2,200,000,000
Revolving Credit Facility
Debt Instrument [Line Items]
Credit facility outstanding balance		0	0
4.738% Series 2018-1 A-1 Notes due 2025 | Sprint
Debt Instrument [Line Items]
Principal Issuances	2,100,000,000
5.152% Series 2018-1 A-2 Notes due 2028 | Sprint
Debt Instrument [Line Items]
Short-term debt		368,000,000
Senior Notes
Debt Instrument [Line Items]
Principal Issuances		$ 7,650,000,000
Senior Notes | Sprint
Debt Instrument [Line Items]
Principal Issuances	$ 3,900,000,000
Senior Notes | Senior Secured Notes Issued in 2021 | Minimum
Debt Instrument [Line Items]
Term preceding maturity date		1 month
Senior Notes | Senior Secured Notes Issued in 2021 | Maximum
Debt Instrument [Line Items]
Term preceding maturity date		3 years
Senior Notes | 3.360% Senior Secured Series 2016-1 A-1 Notes due 2021 | Sprint
Debt Instrument [Line Items]
Payable term	5 years
Principal Issuances	$ 3,500,000,000
Interest rate, stated percentage		3.36%
Securitization program amount	$ 7,000,000,000
Number of instruments | instrument	2
Senior Notes | 4.738% Series 2018-1 A-1 Notes due 2025
Debt Instrument [Line Items]
Interest rate, stated percentage		4.738%
Senior Notes | 4.738% Series 2018-1 A-1 Notes due 2025 | Sprint
Debt Instrument [Line Items]
Interest rate, stated percentage		4.738%
Short-term debt		$ 131,000,000
Senior Notes | 5.152% Series 2018-1 A-2 Notes due 2028 | Sprint
Debt Instrument [Line Items]
Principal Issuances		$ 1,800,000,000
Interest rate, stated percentage		5.152%
Line of Credit | Revolving Credit Facility
Debt Instrument [Line Items]
Financing commitment, amount		$ 7,500,000,000
Line of Credit | Letter of Credit
Debt Instrument [Line Items]
Financing commitment, amount		1,500,000,000
Line of Credit | Bridge Loan
Debt Instrument [Line Items]
Financing commitment, amount		$ 500,000,000
ABS Notes
Debt Instrument [Line Items]
Expected weighted average life		2 years 6 months
Payable term		2 years
Carrying value		$ 1,570,000,000
Gross EIP receivables		2,000,000,000
Commercial Paper
Debt Instrument [Line Items]
Financing commitment, amount					$ 2,000,000,000
Short-term debt		$ 0	$ 0
Loans Payable | Subsequent Event
Debt Instrument [Line Items]
Financing commitment, amount				$ 1,000,000,000

Debt - Schedule of Issuances an

Debt - Schedule of Issuances and Borrowings (Details) - USD ($)						12 Months Ended
	Oct. 09, 2024	Sep. 26, 2024	May 08, 2024	Feb. 14, 2024	Jan. 12, 2024	Dec. 31, 2024
Senior Notes
Debt Instrument [Line Items]
Principal Issuances						$ 7,650,000,000
Discounts and Issuance Costs, Net						(58,000,000)
Net Proceeds from Issuance of Long-Term Debt						7,592,000,000
Secured Debt
Debt Instrument [Line Items]
Principal Issuances						1,000,000,000
Discounts and Issuance Costs, Net						(5,000,000)
Net Proceeds from Issuance of Long-Term Debt						$ 995,000,000
4.850% Senior Notes due 2029
Debt Instrument [Line Items]
Interest rate, stated percentage						4.85%
4.850% Senior Notes due 2029 | Senior Notes
Debt Instrument [Line Items]
Interest rate, stated percentage						4.85%
Principal Issuances					$ 1,000,000,000
Discounts and Issuance Costs, Net					(6,000,000)
Net Proceeds from Issuance of Long-Term Debt					994,000,000
5.150% Senior Notes due 2034
Debt Instrument [Line Items]
Interest rate, stated percentage						5.15%
5.150% Senior Notes due 2034 | Senior Notes
Debt Instrument [Line Items]
Interest rate, stated percentage						5.15%
Principal Issuances					1,250,000,000
Discounts and Issuance Costs, Net					(11,000,000)
Net Proceeds from Issuance of Long-Term Debt					1,239,000,000
5.500% Senior Notes due 2055
Debt Instrument [Line Items]
Interest rate, stated percentage						5.50%
5.500% Senior Notes due 2055 | Senior Notes
Debt Instrument [Line Items]
Interest rate, stated percentage						5.50%
Principal Issuances					750,000,000
Discounts and Issuance Costs, Net					(7,000,000)
Net Proceeds from Issuance of Long-Term Debt					$ 743,000,000
3.550% Senior Notes due 2029 | Senior Notes
Debt Instrument [Line Items]
Interest rate, stated percentage						3.55%
Principal Issuances			$ 645,000,000
Discounts and Issuance Costs, Net			(3,000,000)
Net Proceeds from Issuance of Long-Term Debt			642,000,000
3.700% Senior Notes due 2032 | Senior Notes
Debt Instrument [Line Items]
Interest rate, stated percentage						3.70%
Principal Issuances			806,000,000
Discounts and Issuance Costs, Net			(4,000,000)
Net Proceeds from Issuance of Long-Term Debt			802,000,000
3.850% Senior Notes due 2036 | Senior Notes
Debt Instrument [Line Items]
Interest rate, stated percentage						3.85%
Principal Issuances			699,000,000
Discounts and Issuance Costs, Net			(7,000,000)
Net Proceeds from Issuance of Long-Term Debt			$ 692,000,000
4.200% Senior Notes due 2029
Debt Instrument [Line Items]
Interest rate, stated percentage						4.20%
4.200% Senior Notes due 2029 | Senior Notes
Debt Instrument [Line Items]
Interest rate, stated percentage						4.20%
Principal Issuances		$ 700,000,000
Discounts and Issuance Costs, Net		(4,000,000)
Net Proceeds from Issuance of Long-Term Debt		696,000,000
4.700% Senior Notes due 2035
Debt Instrument [Line Items]
Interest rate, stated percentage						4.70%
4.700% Senior Notes due 2035 | Senior Notes
Debt Instrument [Line Items]
Interest rate, stated percentage						4.70%
Principal Issuances		900,000,000
Discounts and Issuance Costs, Net		(6,000,000)
Net Proceeds from Issuance of Long-Term Debt		894,000,000
5.250% Senior Notes due 2055
Debt Instrument [Line Items]
Interest rate, stated percentage						5.25%
5.250% Senior Notes due 2055 | Senior Notes
Debt Instrument [Line Items]
Interest rate, stated percentage						5.25%
Principal Issuances		900,000,000
Discounts and Issuance Costs, Net		(10,000,000)
Net Proceeds from Issuance of Long-Term Debt		$ 890,000,000
5.050% Class A Senior ABS Notes due 2029
Debt Instrument [Line Items]
Interest rate, stated percentage						5.05%
5.050% Class A Senior ABS Notes due 2029 | ABS Notes due 2029
Debt Instrument [Line Items]
Interest rate, stated percentage						5.05%
Principal Issuances				$ 500,000,000
Discounts and Issuance Costs, Net				(3,000,000)
Net Proceeds from Issuance of Long-Term Debt				$ 497,000,000
4.250% Class A Senior ABS Notes due 2029
Debt Instrument [Line Items]
Interest rate, stated percentage						4.25%
4.250% Class A Senior ABS Notes due 2029 | ABS Notes due 2029
Debt Instrument [Line Items]
Interest rate, stated percentage						4.25%
Principal Issuances	$ 500,000,000
Discounts and Issuance Costs, Net	(2,000,000)
Net Proceeds from Issuance of Long-Term Debt	$ 498,000,000

Debt - Schedule of Debt Instrum

Debt - Schedule of Debt Instrument Redemption and Repayments (Details)	Dec. 31, 2024 USD ($)
Debt Instrument [Line Items]
Principal Amount	$ 1,073,000,000
4.910% Class A Senior ABS Notes due 2028
Debt Instrument [Line Items]
Interest rate, stated percentage	4.91%
Principal Amount	$ 180,000,000
Senior Notes | Affiliates
Debt Instrument [Line Items]
Principal Amount	$ 4,000,000,000
Senior Notes | 7.125% Senior Notes due 2024
Debt Instrument [Line Items]
Interest rate, stated percentage	7.125%
Principal Amount	$ 2,500,000,000
Senior Notes | 7.625% Senior Notes due 2025
Debt Instrument [Line Items]
Principal Amount	$ 1,500,000,000
Senior Notes | 4.738% Series 2018-1 A-1 Notes due 2025
Debt Instrument [Line Items]
Interest rate, stated percentage	4.738%
Principal Amount	$ 525,000,000
Senior Notes | 5.152% Series 2018-1 A-2 Notes due 2028
Debt Instrument [Line Items]
Interest rate, stated percentage	5.152%
Principal Amount	$ 368,000,000

Debt - Schedule of Maturities o

Debt - Schedule of Maturities of ABS Notes (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Debt Instrument [Line Items]
Total	$ 78,265	$ 75,018
ABS Notes
Debt Instrument [Line Items]
2025	570
2026	594
2027	406
Total	$ 1,570

Debt - Schedule of Variable Int

Debt - Schedule of Variable Interest Entities (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Debt Instrument [Line Items]
Equipment installment plan receivables, net	$ 4,379	$ 4,456
Equipment installment plan receivables due after one year, net	2,209	2,042
Other current assets	1,853	2,352
Accounts payable and accrued liabilities	8,463	10,373
Short-term debt	4,068	3,619
Long-term debt	74,197	71,399
Variable Interest Entity, Primary Beneficiary
Debt Instrument [Line Items]
Equipment installment plan receivables, net	1,472	739
Equipment installment plan receivables due after one year, net	352	168
Other current assets	151	101
Accounts payable and accrued liabilities	2	1
Short-term debt	570	198
Long-term debt	$ 996	$ 550

Tower Obligations - Narrative (

Tower Obligations - Narrative (Details) $ in Millions			12 Months Ended
	Jan. 03, 2022 USD ($)	Apr. 01, 2020 USD ($) tower_site renewal_option	Dec. 31, 2012 USD ($) tower_site	Dec. 31, 2024 USD ($) tower_site
Sale Leaseback Transaction [Line Items]
Number of renewal options | renewal_option		0
Tower obligation payments, due next year				$ 380
Tower obligation payments, due within two and three years				788
Tower obligation payment, due within four and five years				835
Tower obligation payments due thereafter				3,700
Lease liability				$ 29,690
Minimum
Sale Leaseback Transaction [Line Items]
Lessee leasing arrangements, operating leases, term of contract (years)				5 years
Maximum
Sale Leaseback Transaction [Line Items]
Lessee leasing arrangements, operating leases, term of contract (years)				15 years
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 (in 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				900
Lease liability				$ 251
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

Tower Obligations - Schedule of

Tower Obligations - Schedule of Impacts to Consolidated Balance Sheets (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Property and equipment, net
Sale Leaseback Transaction [Line Items]
Sale-leasebacks	$ 2,069	$ 2,220
Tower obligations
Sale Leaseback Transaction [Line Items]
Sale-leasebacks	3,664	3,777
Other long-term liabilities
Sale Leaseback Transaction [Line Items]
Sale-leasebacks	$ 554	$ 554

Revenue from Contracts with C_3

Revenue from Contracts with Customers - Schedule of Disaggregation of Revenue (Details) $ in Millions	12 Months Ended
	Dec. 31, 2024 USD ($) customer_category	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Disaggregation of Revenue [Line Items]
Number of customer categories | customer_category	3
Revenues	$ 81,400	$ 78,558	$ 79,571
Postpaid phone revenues
Disaggregation of Revenue [Line Items]
Revenues	45,762	43,449	41,711
Postpaid other revenues
Disaggregation of Revenue [Line Items]
Revenues	6,578	5,243	4,208
Total postpaid service revenues
Disaggregation of Revenue [Line Items]
Revenues	$ 52,340	$ 48,692	$ 45,919

Revenue from Contracts with C_4

Revenue from Contracts with Customers - Schedule of Contract Liability and Receivable Balances (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Revenue from Contract with Customer [Abstract]
Contract Assets	$ 720	$ 607
Contract Liabilities	1,219	812
Change in contract assets included in other current assets	113
Change in contracts liabilities included in deferred revenue	407
Current portion of contract assets	492	495
Amounts included in the beginning of year contract liability balance	$ 787	$ 747	$ 760

Revenue from Contracts with C_5

Revenue from Contracts with Customers - Remaining Performance Obligations, Branded Postpaid Contracts (Details) $ in Billions	12 Months Ended
	Dec. 31, 2024 USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	$ 1.4
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	1.4
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	$ 1.7
Minimum
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining contract duration (in years)	1 year
Maximum
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining contract duration (in years)	7 years
Total postpaid service revenues
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	$ 1.5
Remaining contract duration (in years)	24 months

Revenue from Contracts with C_6

Revenue from Contracts with Customers - Contract Costs (Details) - USD ($)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Capitalized Contract Cost [Abstract]
Deferred incremental costs to obtain contracts	$ 2,000,000,000	$ 2,100,000,000
Average amortization period, deferred contract costs (in months)	24 months
Amortization of deferred costs	$ 2,000,000,000	1,800,000,000	$ 1,500,000,000
Impairment losses recognized on deferred contract cost assets	$ 0	$ 0	$ 0

Revenue from Contracts with C_7

Revenue from Contracts with Customers - Remaining Performance Obligations (Details)	Dec. 31, 2024
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01
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]: 2026-01-01
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]: 2027-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation, expected timing of satisfaction, period

Segment Reporting (Details)

Segment Reporting (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Segment Reporting Information [Line Items]
Total revenues	$ 81,400	$ 78,558	$ 79,571
Less: Significant and other segment expenses
Advertising expense	3,100	2,500	2,300
Bad debt expense	1,192	898	1,026
Impairment expense	0	0	477
(Gain) loss on disposal group held for sale	0	(25)	1,087
Interest expense, net	3,411	3,335	3,364
Other (income) expense, net	(113)	(68)	33
Income tax expense	3,373	2,682	556
Net income	11,339	8,317	2,590
Equipment revenues
Segment Reporting Information [Line Items]
Total revenues	14,263	14,138	17,130
Less: Significant and other segment expenses
Cost of equipment sales	18,882	18,533	21,540
Wireless
Segment Reporting Information [Line Items]
Total revenues	81,400	78,558	79,571
Less: Significant and other segment expenses
Employee expenses	7,041	7,629	7,626
Lease expense	5,066	5,398	6,998
Advertising expense	3,067	2,515	2,306
Bad debt expense	1,192	898	1,026
Other segment items	15,223	16,526	18,317
Impairment expense	0	0	477
(Gain) loss on disposal group held for sale	0	(25)	1,087
Depreciation and amortization	12,919	12,818	13,651
Interest expense, net	3,411	3,335	3,364
Other (income) expense, net	(113)	(68)	33
Income tax expense	3,373	2,682	556
Net income	11,339	8,317	2,590
Wireless | Equipment revenues
Less: Significant and other segment expenses
Cost of equipment sales	$ 18,882	$ 18,533	$ 21,540

Employee Compensation and Ben_3

Employee Compensation and Benefit Plans - Narrative (Details)	12 Months Ended
	Dec. 31, 2024 shares
Restricted Stock and Unit Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (in years)	3 years
Performance Restricted Stock Units | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (in years)	3 years
2023 Incentive Award Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized for issuance (in shares)	33,000,000
Number of shares available for future grants (in shares)	29,000,000

Employee Compensation and Ben_4

Employee Compensation and Benefit Plans - Schedule of Stock-based Compensation Expense and Related Income Tax Benefits (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 649	$ 667	$ 595
Restricted Stock Units and Performance Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	649	667	596
Income tax benefit related to stock-based compensation	$ 129	$ 130	$ 114
Weighted average fair value per stock award granted (in USD per share)	$ 162.99	$ 143.09	$ 126.89
Unrecognized compensation expense	$ 645	$ 637	$ 635
Weighted-average period to be recognized (years)	1 year 9 months 18 days	1 year 9 months 18 days	1 year 9 months 18 days
Fair value of stock awards vested	$ 820	$ 889	$ 743

Employee Compensation and Ben_5

Employee Compensation and Benefit Plans - Schedule of Restricted Stock and Unit Awards and Performance Restricted Stock Units Activity (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value [Abstract]
Taxes paid related to net share settlement of stock awards	$ 269	$ 297	$ 243
Minimum
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value [Abstract]
Share payout percentage	0%
Maximum
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value [Abstract]
Share payout percentage	200%
Restricted Stock Unit
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Nonvested, beginning (in shares)	7,755,943
Prior year grant adjustment (in shares)	(351)
Granted (in shares)	3,775,434
Vested (in shares)	(4,375,499)
Forfeited (in shares)	(518,292)
Nonvested, ending (in shares)	6,637,235	7,755,943
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Nonvested, beginning (in USD per share)	$ 136.67
Prior year grant adjustment (in USD per share)	142.60
Granted (in USD per share)	163.72
Vested (in USD per share)	135.88
Forfeited (in USD per share)	149.33
Nonvested, ending (in USD per share)	$ 151.55	$ 136.67
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]
Nonvested, December 31, 2023	9 months 18 days	10 months 24 days
Nonvested, December 31, 2024	9 months 18 days	10 months 24 days
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value [Abstract]
Nonvested, Aggregate Intrinsic Value, beginning	$ 1,465	$ 1,244
Nonvested, Aggregate Intrinsic Value, ending	$ 1,465	$ 1,244
Performance Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Nonvested, beginning (in shares)	689,806
Granted (in shares)	146,154
Performance award achievement adjustments (in shares)	95,503
Vested (in shares)	(372,099)
Nonvested, ending (in shares)	559,364	689,806
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Nonvested, beginning (in USD per share)	$ 145.32
Granted (in USD per share)	164.65
Performance award achievement adjustments (in USD per share)	131.26
Vested (in USD per share)	127.55
Nonvested, ending (in USD per share)	$ 159.79	$ 145.32
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]
Nonvested, December 31, 2023	10 months 24 days	1 year
Nonvested, December 31, 2024	10 months 24 days	1 year
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value [Abstract]
Nonvested, Aggregate Intrinsic Value, beginning	$ 123	$ 111
Nonvested, Aggregate Intrinsic Value, ending	$ 123	$ 111
Restricted Stock Units and Performance Stock Units
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Granted (in USD per share)	$ 162.99	$ 143.09	$ 126.89
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value [Abstract]
Shares paid for tax withholding for share based compensation (in shares)	1,552,111	2,027,800	1,900,710

Employee Compensation and Ben_6

Employee Compensation and Benefit Plans - Employee Stock Purchase Plan (Details) - shares	1 Months Ended	12 Months Ended
	Jun. 30, 2023	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]
Contribution percentage (up to)		15%
Stock purchase discount percentage		15%
ESPP, offering period		6 months
ESPP plan increasing shares reserve (in shares)	14,000,000
Number of securities remaining available for future sale and issuance under ESPP (in shares)		11,772,709
Common Stock
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]
Number of shares issued under ESPP (in shares)		1,519,242	1,771,475	2,079,086

Employee Compensation and Ben_7

Employee Compensation and Benefit Plans - Schedule of Pension Plan (Details) - USD ($) $ in Millions	1 Months Ended	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Expected long-term rate of return on plan assets		7%	7%
Actual rate of return on plan assets during period		6%	11%
Expected long-term rate of return on investments		8%
Interest on projected benefit obligations		$ 83	$ 86	$ 65
Gain on settlement and amortization of actuarial gain		(119)	(59)	0
Expected return on pension plan assets		(99)	(97)	(71)
Net pension benefit		$ (135)	$ (70)	$ (6)
Percent at quoted price		26%	17%
Percent at similar assets		62%	79%
Percent supported at unobservable inputs		12%	4%
Postretirement benefit plan assets	$ 626	$ 626	$ 1,300
Projected benefit obligations	895	895	1,600
Underfunded plan	$ 269	$ 269	$ 350
Discount rate	6%	6%	5%
Contributions to benefit plan		$ 52	$ 32
Expected future contributions	$ 66	66
Expected payment, year one	51	51
Expected payment, years two and three	110	110
Expected payment, years four and five	119	119
Expected payment, thereafter	320	$ 320
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Interest Cost, Statement of Income or Comprehensive Income [Extensible Enumeration]		Other income (expense), net	Other income (expense), net	Other income (expense), net
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Excluding Service Cost, Statement of Income or Comprehensive Income [Extensible Enumeration]		Other income (expense), net	Other income (expense), net	Other income (expense), net
Sprint Retirement Pension Plan
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Settlement for a portion of retiree obligations	572
Gain on settlement of pension plan obligation	$ 80
Defined Benefit Plan, Equity Securities, US
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Target allocation, percentage	48%	48%
Fixed Income Securities
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Target allocation, percentage	39%	39%
Defined Benefit Plan, Real Estate
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Target allocation, percentage	13%	13%

Employee Compensation and Ben_8

Employee Compensation and Benefit Plans - Employee Retirement Savings Plan (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Share-Based Payment Arrangement [Abstract]
Employer retirement savings plan, matching contributions	$ 159	$ 171	$ 175

Income Taxes - Schedule of Inco

Income Taxes - Schedule of Income Tax Domestic and Foreign (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Income Tax Disclosure [Abstract]
U.S. income	$ 14,607	$ 10,943	$ 3,116
Foreign income	105	56	30
Income before income taxes	$ 14,712	$ 10,999	$ 3,146

Income Taxes - Schedule of Comp

Income Taxes - Schedule of Components of Income Tax Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Current tax (expense) benefit
Federal	$ (57)	$ (42)	$ 22
State	(179)	(28)	(64)
Foreign	(17)	(12)	(22)
Total current tax expense	(253)	(82)	(64)
Deferred tax (expense) benefit
Federal	(2,743)	(2,150)	(628)
State	(348)	(417)	77
Foreign	(29)	(33)	59
Total deferred tax expense	(3,120)	(2,600)	(492)
Total income tax expense	$ (3,373)	$ (2,682)	$ (556)

Income Taxes - Schedule of Effe

Income Taxes - Schedule of Effective Income Tax Rate Reconciliation (Details)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Effective Income Tax Rate Reconciliation, Percent [Abstract]
Federal statutory income tax rate	21%	21%	21%
State taxes, net of federal benefit	3.30%	4.20%	4.50%
Effect of law and rate changes	0.10%	(0.10%)	(5.30%)
Change in valuation allowance	(0.20%)	(0.20%)	(0.80%)
Foreign taxes	0.30%	0.40%	0.70%
Permanent differences	0.30%	(0.10%)	(0.20%)
Federal tax credits	(1.10%)	(0.80%)	(2.40%)
Equity-based compensation	(0.30%)	(0.40%)	(1.20%)
Non-deductible compensation	(0.10%)	0.50%	1.20%
Other, net	(0.40%)	(0.10%)	0.20%
Effective income tax rate	22.90%	24.40%	17.70%

Income Taxes - Schedule of Defe

Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Deferred tax assets
Loss carryforwards	$ 3,844	$ 6,227
Lease liabilities	7,781	8,355
Reserves and accruals	958	1,177
Other	3,959	4,459
Deferred tax assets, gross	16,542	20,218
Valuation allowance	(259)	(306)	$ (375)
Deferred tax assets, net	16,283	19,912
Deferred tax liabilities
Spectrum licenses	19,527	19,006
Property and equipment	5,874	6,142
Lease right-of-use assets	6,508	7,043
Other	1,074	1,179
Total deferred tax liabilities	32,983	33,370
Net deferred tax liabilities	$ 16,700	$ 13,458

Income Taxes - Narrative (Detai

Income Taxes - Narrative (Details) - USD ($)	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Valuation Allowance [Line Items]
Indirect tax effects excluded	$ 181,000,000
Valuation allowance	259,000,000	$ 306,000,000	$ 375,000,000
Unrecognized tax benefits that would impact effective tax rate	1,300,000,000	$ 1,300,000,000	$ 962,000,000
Federal
Valuation Allowance [Line Items]
Unrecognized tax benefits, net operating loss	2,900,000,000
Operating loss carryforwards	167,000,000
Federal | Research Tax Credit Carryforward
Valuation Allowance [Line Items]
Federal and state tax credits	582,000,000
State
Valuation Allowance [Line Items]
Unrecognized tax benefits, net operating loss	1,600,000,000
Operating loss carryforwards	701,000,000
Foreign Tax Authority
Valuation Allowance [Line Items]
Unrecognized tax benefits, net operating loss	4,000,000
Operating loss carryforwards	4,000,000
Federal and State Tax Authorities | Research Tax Credit Carryforward
Valuation Allowance [Line Items]
Unrecognized tax benefits, net operating loss	$ 2,800,000,000

Income Taxes - Schedule of Unre

Income Taxes - Schedule of Unrecognized Tax Benefits (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Unrecognized tax benefits, beginning of year	$ 1,477	$ 1,254	$ 1,217
Gross increases to tax positions in prior periods	140	19	31
Gross decreases to tax positions in prior periods	(201)	(39)	(65)
Gross increases to current period tax positions	132	256	77
Gross decreases due to settlements with taxing authorities	(11)	0	(3)
Gross decreases due to statute of limitations lapse	(67)	(13)	(3)
Unrecognized tax benefits, end of year	$ 1,470	$ 1,477	$ 1,254

Stockholder Return Programs (De

Stockholder Return Programs (Details) - USD ($) $ / shares in Units, $ in Millions

1 Months Ended

3 Months Ended

9 Months Ended

12 Months Ended

Mar. 13, 2025

Dec. 12, 2024

Sep. 12, 2024

Jun. 13, 2024

Mar. 14, 2024

Dec. 15, 2023

Jan. 24, 2025

Dec. 31, 2024

Sep. 30, 2024

Jun. 30, 2024

Mar. 31, 2024

Sep. 30, 2023

Sep. 30, 2023

Dec. 31, 2024

Dec. 31, 2023

Dec. 31, 2022

Dec. 13, 2024

Sep. 06, 2023

Sep. 08, 2022

Equity, Class of Treasury Stock [Line Items]

Purchase price

$ 11,206

$ 13,255

$ 3,000

Common stock, dividends declared (in USD per share)

$ 3.71

$ 0.65

Dividends on common stock

$ 3,300

$ 747

$ 0

2022 Stock Repurchase Program

Equity, Class of Treasury Stock [Line Items]

Stock repurchase program, authorized amount

$ 14,000

Repurchases of common stock (in shares)

77,460,937

Average price paid per share (in USD per share)

$ 141.57

Purchase price

$ 11,000

2023-2024 Stockholder Return Program

Equity, Class of Treasury Stock [Line Items]

Stock repurchase program, authorized amount

$ 19,000

Repurchases of common stock (in shares)

59,376,922

15,464,107

Average price paid per share (in USD per share)

$ 187.07

$ 144.95

Purchase price

$ 11,100

$ 2,200

Common stock, dividends paid (in USD per share)

$ 0.88

$ 0.65

$ 0.65

$ 0.65

$ 0.65

Dividends on common stock

3,300

747

2023-2024 Stockholder Return Program | DT

Equity, Class of Treasury Stock [Line Items]

Dividends on common stock

$ 1,700

$ 393

2023-2024 Stockholder Return Program | O 2023 Q4 Dividends

Equity, Class of Treasury Stock [Line Items]

Common stock, dividends declared (in USD per share)

$ 0.65

2023-2024 Stockholder Return Program | 2024 Q1 Dividends Declared

Equity, Class of Treasury Stock [Line Items]

Common stock, dividends declared (in USD per share)

$ 0.65

2023-2024 Stockholder Return Program | 2024 Q2 Dividends Declared

Equity, Class of Treasury Stock [Line Items]

Common stock, dividends declared (in USD per share)

$ 0.65

2023-2024 Stockholder Return Program | 2024 Q3 Dividends Declared

Equity, Class of Treasury Stock [Line Items]

Common stock, dividends declared (in USD per share)

$ 0.65

2023-2024 Stockholder Return Program | 2024 Q4 Dividends Declared

Equity, Class of Treasury Stock [Line Items]

Common stock, dividends declared (in USD per share)

$ 0.88

2025 Stockholder Return Program

Equity, Class of Treasury Stock [Line Items]

Stock repurchase program, authorized amount

$ 14,000

Repurchases of common stock (in shares)

0

Dividends payable

$ 1,000

$ 1,000

Stock repurchase authorization amount

14,000

14,000

2025 Stockholder Return Program | Subsequent Event

Equity, Class of Treasury Stock [Line Items]

Repurchases of common stock (in shares)

2,855,113

Average price paid per share (in USD per share)

$ 216.03

Purchase price

$ 617

Stock repurchase authorization amount

$ 13,400

2025 Stockholder Return Program | Forecast

Equity, Class of Treasury Stock [Line Items]

Common stock, dividends paid (in USD per share)

$ 0.88

2025 Stockholder Return Program | DT

Equity, Class of Treasury Stock [Line Items]

Dividends payable

$ 518

$ 518

2025 Stockholder Return Program | 2024 Q4 Dividends Declared

Equity, Class of Treasury Stock [Line Items]

Common stock, dividends declared (in USD per share)

$ 0.88

Earnings Per Share - Schedule o

Earnings Per Share - Schedule of Computation of Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Earnings Per Share [Abstract]
Net income	$ 11,339	$ 8,317	$ 2,590
Weighted-average shares outstanding - basic (in shares)	1,169,195,373	1,185,121,562	1,249,763,934
Effect of dilutive securities:
Outstanding stock options, unvested stock awards and SoftBank contingent consideration (in shares)	4,018,525	15,164,702	5,612,835
Weighted-average shares outstanding - diluted (in shares)	1,173,213,898	1,200,286,264	1,255,376,769
Earnings per share - basic (in USD per share)	$ 9.70	$ 7.02	$ 2.07
Earnings per share - diluted (in USD per share)	$ 9.66	$ 6.93	$ 2.06
Outstanding stock options and unvested stock awards
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potentially dilutive securities (in shares)	25,652	148,537	16,616
SoftBank contingent consideration
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potentially dilutive securities (in shares)	0	0	48,751,557
Ka’ena Acquisition contingent consideration
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potentially dilutive securities (in shares)	750,162	0	0

Earnings Per Share - Narrative

Earnings Per Share - Narrative (Details) $ / shares in Units, $ in Millions			12 Months Ended
		Dec. 22, 2023 USD ($) d $ / shares	Dec. 31, 2024 d $ / shares shares	Dec. 31, 2023 USD ($) shares
Class of Stock [Line Items]
SoftBank contingent shares settlement | $	[1]			$ 52
SoftBank contingent consideration
Class of Stock [Line Items]
Number of trailing trading-day | d		45	45
Threshold price, weighted average price per share (in USD per share)			$ 150
Number of shares issued if threshold not met (in USD per share)		$ 149.35
SoftBank contingent shares settlement | $		$ 6,900
Mandatory Convertible Preferred Stock Series A
Class of Stock [Line Items]
Preferred shares authorized (in shares) | shares			100,000,000
Preferred stock, par value (in USD per share)			$ 0.00001
Preferred shares outstanding (in shares) | shares			0	0
[1]Represents the issuance of the SoftBank Specified Shares pursuant to the Letter Agreement. See Note 1 6 – Earnings Per Share of the Notes to the Consolidated Financial Statements for more information.

Leases - Narrative (Details)

Leases - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Lessee, Lease, Description [Line Items]
Interest payments for financing leases	$ 111	$ 79	$ 68
Leases not yet commenced	$ 24
Minimum
Lessee, Lease, Description [Line Items]
Lessee leasing arrangements, operating leases, term of contract (years)	5 years
Lessee, operating lease, renewal term (years)	5 years
Lessee leasing arrangements, finance leases, term of contract	3 years
Maximum
Lessee, Lease, Description [Line Items]
Lessee leasing arrangements, operating leases, term of contract (years)	15 years
Lessee, operating lease, renewal term (years)	50 years
Lessee leasing arrangements, finance leases, term of contract	5 years

Leases - Schedule of Components

Leases - Schedule of Components of Lease Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Leases [Abstract]
Operating lease expense	$ 4,787	$ 4,987	$ 6,514
Financing lease expense:
Amortization of right-of-use assets	787	684	733
Interest on lease liabilities	111	79	68
Total financing lease expense	898	763	801
Variable lease expense	279	411	484
Total lease expense	$ 5,964	$ 6,161	$ 7,799

Leases - Schedule of Informatio

Leases - Schedule of Information Related to Lease Term and Discount Rate (Details)	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Weighted-Average Remaining Lease Term (Years)
Operating leases	8 years	9 years	10 years
Financing leases	2 years	2 years	2 years
Weighted-Average Discount Rate
Operating leases	4.40%	4.30%	4.10%
Financing leases	5.30%	4.60%	3.20%

Leases - Schedule of Maturity o

Leases - Schedule of Maturity of Operating and Finance Lease Liabilities (Details) $ in Millions	Dec. 31, 2024 USD ($)
Operating Leases
2025	$ 4,491
2026	4,400
2027	4,093
2028	3,763
2029	3,478
Thereafter	15,664
Total lease payments	35,889
Less: imputed interest	6,199
Total	29,690
Finance Leases
2025	1,242
2026	809
2027	357
2028	25
2029	4
Thereafter	0
Total lease payments	2,437
Less: imputed interest	111
Total	$ 2,326

Commitments and Contingencies (

Commitments and Contingencies (Details) $ in Millions

3 Months Ended

12 Months Ended

24 Months Ended

Jan. 13, 2025 USD ($)

Dec. 31, 2024 USD ($)

Dec. 06, 2024 USD ($)

Aug. 05, 2024 USD ($)

May 24, 2024 USD ($)

Sep. 12, 2023 USD ($)

Aug. 25, 2023 USD ($)

Mar. 30, 2023 USD ($)

Jan. 05, 2023 customer_account

Aug. 08, 2022 USD ($)

Jun. 30, 2025 USD ($)

Dec. 31, 2024 USD ($)

Dec. 31, 2025 USD ($)

Dec. 31, 2024 USD ($)

Dec. 31, 2023 USD ($)

Dec. 31, 2022 USD ($)

Dec. 31, 2028 USD ($)

Dec. 20, 2024

Sep. 30, 2022 USD ($)

Jun. 30, 2022 USD ($)

Loss Contingencies [Line Items]

Purchase commitment, due next year

$ 4,600

$ 4,600

$ 4,600

Purchase commitment, due within two and three years

5,100

5,100

5,100

Purchase commitment, due within four and five years

2,200

2,200

2,200

Purchase commitment, due thereafter

2,300

2,300

2,300

Estimated incremental future minimum lease payments

24

24

24

Lease and service credit commitment, due next year

289

289

289

Lease and service credit commitment, due within two and three years

613

613

613

Lease and service credit commitment, due within four and five years

641

641

641

Lease and service credit commitment, due thereafter

$ 3,800

3,800

3,800

Legal settlement paid

$ 350

Aggregate incremental expense

$ 150

$ 150

Number of customer accounts impacted | customer_account

37,000,000

Selling, General and Administrative Expenses

Loss Contingencies [Line Items]

Aggregate incremental expense

$ 400

$ 400

Reimbursements from insurance carriers for costs

$ 105

$ 50

$ 100

Minimum

Loss Contingencies [Line Items]

Lessee leasing arrangements, operating leases, term of contract (years)

5 years

5 years

5 years

Maximum

Loss Contingencies [Line Items]

Lessee leasing arrangements, operating leases, term of contract (years)

15 years

15 years

15 years

Channel 51 License Co, LLC and LB License Co, LLC | Licensing Agreements

Loss Contingencies [Line Items]

Total cash consideration

$ 3,500

$ 3,500

Consideration transferred

$ 541

$ 2,400

Channel 51 License Co, LLC and LB License Co, LLC | Licensing Agreements | Second Tranche

Loss Contingencies [Line Items]

Total cash consideration

$ 604

$ 1,100

Comcast Corporation | Licensing Agreements | Minimum

Loss Contingencies [Line Items]

Total cash consideration

$ 1,200

Comcast Corporation | Licensing Agreements | Minimum | Subsequent Event

Loss Contingencies [Line Items]

Total cash consideration

$ 1,200

Comcast Corporation | Licensing Agreements | Maximum

Loss Contingencies [Line Items]

Total cash consideration

$ 3,300

Comcast Corporation | Licensing Agreements | Maximum | Subsequent Event

Loss Contingencies [Line Items]

Total cash consideration

$ 3,400

Spectrum Licenses | Channel 51 License Co, LLC and LB License Co, LLC | Licensing Agreements

Loss Contingencies [Line Items]

Total cash consideration

$ 3,500

UScellular Wireless Assets Operations | Purchase Agreement

Loss Contingencies [Line Items]

Payments for asset acquisition

$ 4,400

Asset acquisition, maximum transferred liabilities incurred

$ 2,000

Vistar Media Inc.

Loss Contingencies [Line Items]

Business acquisition, outstanding (percent)

100%

Forecast | UScellular Wireless Assets Operations | Purchase Agreement

Loss Contingencies [Line Items]

Lessee leasing arrangements, operating leases, term of contract (years)

15 years

Estimated incremental future minimum lease payments

$ 1,400

Lumos | Forecast

Loss Contingencies [Line Items]

Expected investment to acquire interest in joint venture

$ 950

$ 500

Ownership interest in joint venture (percent)

50%

Metronet | Forecast

Loss Contingencies [Line Items]

Expected investment to acquire interest in joint venture

$ 4,900

Ownership interest in joint venture (percent)

50%

Restructuring Costs - Schedule

Restructuring Costs - Schedule of Restructuring Plan Expenses Incurred (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	$ 95	$ 337	$ 1,196
Incurred to Date	$ 2,903
Restructuring Incurred Cost Statement Of Income Or Comprehensive Income Extensible Enumeration Not Disclosed Flag	Total restructuring plan expenses
Contract termination costs
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	$ 4	45	231
Incurred to Date	472
Severance costs
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	0	3	169
Incurred to Date	574
Network decommissioning
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	91	$ 289	$ 796
Incurred to Date	$ 1,857

Restructuring Costs - Narrative

Restructuring Costs - Narrative (Details) $ in Millions	1 Months Ended	12 Months Ended
	Aug. 31, 2023 position	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Restructuring Cost and Reserve [Line Items]
Amortization of the right-of-use assets on lease contracts | $		$ 91	$ 390	$ 1,700
2023 Workforce Reduction
Restructuring Cost and Reserve [Line Items]
Number of positions | position	5,000
Restructuring and related cost, workforce reduction size of percentage	7%

Restructuring Costs - Schedul_2

Restructuring Costs - Schedule of Activity Related to Reduction Initiative Expenses Incurred (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Restructuring Cost and Reserve [Line Items]
Incurred to Date	$ 2,903
Severance costs
Restructuring Cost and Reserve [Line Items]
Incurred to Date	574
Severance costs | 2023 Workforce Reduction
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	(5)	$ 462
Incurred to Date	$ 457

Additional Financial Informat_3

Additional Financial Information - Schedule of Accounts Payable and Accrued Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Accounts Payable and Accrued Liabilities [Line Items]
Accounts payable	$ 4,242	$ 5,573
Payroll and related benefits	1,072	1,142
Property and other taxes, including payroll	1,524	1,704
Accrued interest	905	818
Other accrued liabilities	720	1,136
Accounts payable and accrued liabilities	8,463	10,373
Accounts Payable and Accrued Liabilities
Accounts Payable and Accrued Liabilities [Line Items]
Outstanding checks	$ 460	$ 740

Additional Financial Informat_4

Additional Financial Information - Schedule of Related Party Transactions (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Accounts Payable and Accrued Liabilities [Line Items]
Dividends on common stock	$ 3,300	$ 747	$ 0
2023-2024 Stockholder Return Program
Accounts Payable and Accrued Liabilities [Line Items]
Dividends on common stock	3,300	747
2023-2024 Stockholder Return Program | DT
Accounts Payable and Accrued Liabilities [Line Items]
Dividends on common stock	1,700	393
Affiliates
Accounts Payable and Accrued Liabilities [Line Items]
Fees incurred for use of the T-Mobile brand	80	80	80
International long distance agreement	19	20	25
Reimbursement of certain administrative expenses	$ 4	$ 4	$ 4

Additional Financial Informat_5

Additional Financial Information - Schedule of Supplemental Consolidated Statements of Cash Flows Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Supplemental Financial Statement Elements [Abstract]
Interest payments, net of amounts capitalized	$ 3,683	$ 3,546	$ 3,485
Operating lease payments	5,162	5,062	4,205
Income tax payments	211	149	76
Non-cash investing and financing activities
Non-cash beneficial interest obtained in exchange for securitized receivables	2,421	3,990	4,192
Change in accounts payable and accrued liabilities for purchases of property and equipment	105	(860)	133
Increase in Tower obligations from contract modification	0	0	1,158
Operating lease right-of-use assets obtained in exchange for lease obligations	1,741	2,141	7,462
Financing lease right-of-use assets obtained in exchange for lease obligations	1,222	1,224	1,256
Contingent and other deferred consideration related to the Ka’ena Acquisition	$ 218	$ 0	$ 0

Additional Financial Informat_6

Additional Financial Information - Schedule of Cash and Cash Equivalents, Including Restricted Cash (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Supplemental Financial Statement Elements [Abstract]
Cash and cash equivalents	$ 5,409	$ 5,135
Restricted cash (included in Other current assets)	231	101
Restricted cash (included in Other assets)	73	71
Cash and cash equivalents, including restricted cash	$ 5,713	$ 5,307

Subsequent Events (Details)

Subsequent Events (Details) - USD ($) $ / shares in Units, $ in Millions	1 Months Ended	12 Months Ended
	Jan. 24, 2025	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Jan. 31, 2025
Subsequent Event [Line Items]
Purchase price		$ 11,206	$ 13,255	$ 3,000
2025 Stockholder Return Program
Subsequent Event [Line Items]
Shares repurchased (in shares)		0
Subsequent Event | Loans Payable
Subsequent Event [Line Items]
Financing commitment, amount					$ 1,000
Subsequent Event | 2025 Stockholder Return Program
Subsequent Event [Line Items]
Shares repurchased (in shares)	2,855,113
Average price paid per share (in USD per share)	$ 216.03
Purchase price	$ 617