Wireless Licenses, Goodwill and Other Intangible Assets - Additional Information (Detail) - Wireless Licenses - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2025	Mar. 31, 2024
Indefinite-lived Intangible Assets [Line Items]
Wireless licenses under development	$ 9,400	$ 13,900
Interest costs capitalized	$ 122	$ 180
Average remaining renewal period of wireless license portfolio (in years)	15 years

Amount of structure or a modification to a structure under construction. Includes recently completed structures or modifications to structures that have not been placed into service.

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Amount of interest capitalized during the period.

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