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Acquisitions and Divestitures - Acquisitions (Details) - USD ($) $ in Millions		1 Months Ended	3 Months Ended		21 Months Ended
	Nov. 23, 2021	Feb. 28, 2021	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2024
Business Acquisition [Line Items]
Payments for deposits			$ 598	$ 1,838
Estimated fair value of the contingent consideration			218
Spectrum licenses \| Spectrum Licenses, C-Band
Business Acquisition [Line Items]
Estimated clearing and incentive costs		$ 7,700
Spectrum licenses \| Spectrum Licenses, C-Band \| Scenario, Forecast
Business Acquisition [Line Items]
Estimated clearing and incentive costs					$ 4,700
Spectrum licenses \| Spectrum Licenses, C-Band \| Projected Clearing Costs
Business Acquisition [Line Items]
Payments for deposits			114	$ 1,400
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			$ 102