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Wireless Licenses, Goodwill and Other Intangible Assets - Composition of Other Intangible Assets, Net (Detail) - USD ($)
$ in Millions
Sep. 30, 2024
Dec. 31, 2023
Finite-Lived Intangible Assets [Line Items]    
Gross Amount $ 33,894 $ 32,515
Accumulated Amortization (23,220) (21,458)
Net Amount 10,674 11,057
Customer Lists    
Finite-Lived Intangible Assets [Line Items]    
Gross Amount 4,242 4,335
Accumulated Amortization (2,503) (2,193)
Net Amount $ 1,739 2,142
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]    
Gross Amount $ 26,989 25,524
Accumulated Amortization (19,240) (17,949)
Net Amount $ 7,749 7,575
Non-Network Internal-Use Software | Minimum    
Finite-Lived Intangible Assets [Line Items]    
Other intangible asset, useful life 3 years  
Non-Network Internal-Use Software | Maximum    
Finite-Lived Intangible Assets [Line Items]    
Other intangible asset, useful life 7 years  
Other    
Finite-Lived Intangible Assets [Line Items]    
Gross Amount $ 2,663 2,656
Accumulated Amortization (1,477) (1,316)
Net Amount $ 1,186 $ 1,340
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