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Acquisitions and Divestitures - Acquisitions (Details) - USD ($) $ in Millions		1 Months Ended		9 Months Ended		15 Months Ended
	Nov. 23, 2021	Oct. 31, 2023	Feb. 28, 2021	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2024
Business Acquisition [Line Items]
Payments for deposits				$ 1,859	$ 2,890
Business acquisition, purchase price in cash				0	(248)
Estimated fair value of the contingent consideration				125
Spectrum licenses | Spectrum Licenses, C-Band
Business Acquisition [Line Items]
Estimated clearing and incentive costs			$ 7,600
Spectrum licenses | Spectrum Licenses, C-Band | Scenario, Forecast
Business Acquisition [Line Items]
Estimated clearing and incentive costs						$ 400
Spectrum licenses | Spectrum Licenses, C-Band | Projected Clearing Costs
Business Acquisition [Line Items]
Payments for deposits				578	1,600
Spectrum licenses | Spectrum Licenses, C-Band | Projected Clearing Costs | Subsequent Event
Business Acquisition [Line Items]
Payments for deposits		$ 3,700
TracFone Wireless, Inc.
Business Acquisition [Line Items]
Business acquisition, purchase price in cash	$ 3,500
Number of shares issuable (in shares)	57,596,544
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable	$ 3,000
Future cash consideration related to achievement of certain performance measures	650
Estimated fair value of the contingent consideration	$ 560
Contingent consideration, earn out period	2 years
Contingent consideration payment				$ 182	113
Cash proceeds from acquisition					$ 248

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