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Wireless Licenses, Goodwill and Other Intangible Assets - Composition of Other Intangible Assets, Net (Detail) - USD ($)
$ in Millions
Sep. 30, 2023
Dec. 31, 2022
Finite-Lived Intangible Assets [Line Items]    
Gross Amount $ 31,834 $ 30,562
Accumulated Amortization (20,882) (19,101)
Net Amount 10,952 11,461
Customer Lists    
Finite-Lived Intangible Assets [Line Items]    
Gross Amount 4,335 4,335
Accumulated Amortization (2,049) (1,646)
Net Amount $ 2,286 2,689
Customer Lists | Minimum    
Finite-Lived Intangible Assets [Line Items]    
Other intangible asset, useful life 5 years  
Customer Lists | Maximum    
Finite-Lived Intangible Assets [Line Items]    
Other intangible asset, useful life 13 years  
Non-Network Internal-Use Software    
Finite-Lived Intangible Assets [Line Items]    
Other intangible asset, useful life 7 years  
Gross Amount $ 24,853 23,421
Accumulated Amortization (17,586) (16,397)
Net Amount 7,267 7,024
Other    
Finite-Lived Intangible Assets [Line Items]    
Gross Amount 2,646 2,806
Accumulated Amortization (1,247) (1,058)
Net Amount $ 1,399 $ 1,748
Other | Minimum    
Finite-Lived Intangible Assets [Line Items]    
Other intangible asset, useful life 4 years  
Other | Maximum    
Finite-Lived Intangible Assets [Line Items]    
Other intangible asset, useful life 25 years