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Wireless Licenses, Goodwill and Other Intangible Assets - Additional Information (Detail) - Wireless Licenses - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024
Indefinite-lived Intangible Assets [Line Items]
Wireless licenses under development	$ 7,900	$ 11,300
Interest costs capitalized	$ 338	$ 485
Average remaining renewal period of wireless license portfolio (in years)	10 years

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