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Wireless Licenses, Goodwill and Other Intangible Assets - Additional Information (Detail) - USD ($) $ in Millions	1 Months Ended	9 Months Ended
	Oct. 31, 2023	Sep. 30, 2023	Sep. 30, 2022
Indefinite-lived Intangible Assets [Line Items]
Payments for deposits		$ 1,859	$ 2,890
Wireless Licenses
Indefinite-lived Intangible Assets [Line Items]
Wireless licenses under development		22,100	45,400
Interest costs capitalized		$ 1,200	1,300
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		$ 578	$ 1,600
Spectrum licenses | Spectrum Licenses, C-Band | Projected Clearing Costs | Subsequent Event
Indefinite-lived Intangible Assets [Line Items]
Payments for deposits	$ 3,700

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