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Wireless Licenses, Goodwill and Other Intangible Assets - Amortization Expense for Other Intangible Assets (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract]      
Amortization expense for other intangible assets $ 2,687 $ 2,507 $ 2,087