Wireless Licenses, Goodwill and Other Intangible Assets - Composition of Other Intangible Assets, Net (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Finite-Lived Intangible Assets [Line Items]
Gross Amount	$ 30,562	$ 28,485
Accumulated Amortization	(19,101)	(16,808)
Net Amount	11,461	11,677
Customer lists
Finite-Lived Intangible Assets [Line Items]
Gross Amount	4,335	4,201
Accumulated Amortization	(1,646)	(1,126)
Net Amount	$ 2,689	3,075
Customer lists | Minimum
Finite-Lived Intangible Assets [Line Items]
Useful life for finite-lived intangible assets, years	5 years
Customer lists | Maximum
Finite-Lived Intangible Assets [Line Items]
Useful life for finite-lived intangible assets, years	13 years
Non-Network Internal-Use Software
Finite-Lived Intangible Assets [Line Items]
Useful life for finite-lived intangible assets, years	7 years
Gross Amount	$ 23,421	21,310
Accumulated Amortization	(16,397)	(14,897)
Net Amount	7,024	6,413
Other
Finite-Lived Intangible Assets [Line Items]
Gross Amount	2,806	2,974
Accumulated Amortization	(1,058)	(785)
Net Amount	$ 1,748	$ 2,189
Other | Minimum
Finite-Lived Intangible Assets [Line Items]
Useful life for finite-lived intangible assets, years	4 years
Other | Maximum
Finite-Lived Intangible Assets [Line Items]
Useful life for finite-lived intangible assets, years	25 years