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Wireless Licenses, Goodwill and Other Intangible Assets - Additional Information (Detail) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
Indefinite-lived Intangible Assets [Line Items]
Payments for deposits	$ 768	$ 1,859
Wireless Licenses
Indefinite-lived Intangible Assets [Line Items]
Wireless licenses under development	11,300	22,100
Interest costs capitalized	$ 485	1,200
Average remaining renewal period of wireless license portfolio (in years)	10 years
Spectrum licenses | Spectrum Licenses, C-Band | Projected Clearing Costs
Indefinite-lived Intangible Assets [Line Items]
Payments for deposits	$ 269	$ 578

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