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Acquisitions and Divestitures (Details) - USD ($) $ / shares in Units, $ in Millions				1 Months Ended	9 Months Ended
	Oct. 17, 2024	Sep. 04, 2024	Nov. 23, 2021	Feb. 28, 2021	Sep. 30, 2024	Sep. 30, 2023
Business Acquisition [Line Items]
Payments for deposits					$ 768	$ 1,859
Spectrum Licenses, United States Cellular Corporation (UScellular) \| Subsequent Event
Business Acquisition [Line Items]
Asset acquisition, consideration transferred	$ 1,000
Spectrum licenses \| Spectrum Licenses, C-Band
Business Acquisition [Line Items]
Estimated clearing and incentive costs				$ 7,500
Spectrum licenses \| Spectrum Licenses, C-Band \| Projected Clearing Costs
Business Acquisition [Line Items]
Payments for deposits					269	578
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	$ 182
Frontier
Business Acquisition [Line Items]
Business acquisition, share price (in dollars per share)		$ 38.50
Business combination, termination fee		$ 590
Frontier \| Frontier
Business Acquisition [Line Items]
Business combination, termination fee		$ 320