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Acquisitions and Divestitures - Acquisitions (Details) - USD ($) $ in Millions		1 Months Ended	3 Months Ended		9 Months Ended
	Nov. 23, 2021	Feb. 28, 2021	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2024
Business Acquisition [Line Items]
Payments for deposits			$ 449	$ 598
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					$ 100
Spectrum licenses | Spectrum Licenses, C-Band | Projected Clearing Costs
Business Acquisition [Line Items]
Payments for deposits			269	114
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
Contingent consideration	$ 560
Contingent consideration, earn out period	2 years
Contingent consideration payment			$ 52	$ 102

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