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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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