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Wireless Licenses, Goodwill and Other Intangible Assets - Additional Information (Detail) - Wireless Licenses - USD ($) $ in Millions | 6 Months Ended
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Jun. 30, 2025 | Jun. 30, 2024
Indefinite-lived Intangible Assets [Line Items] |  |
Wireless licenses under development | $ 8,600 | $ 11,800
Interest costs capitalized | $ 234 | $ 338
Average remaining renewal period of wireless license portfolio (in years) | 10 years |

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