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Wireless Licenses, Goodwill and Other Intangible Assets - Composition of Other Intangible Assets, Net (Detail) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Finite-Lived Intangible Assets [Line Items]    
Gross Amount $ 35,378 $ 35,042
Accumulated Amortization (24,862) (23,913)
Net Amount 10,516 11,129
Customer Lists    
Finite-Lived Intangible Assets [Line Items]    
Gross Amount 4,245 4,242
Accumulated Amortization (2,997) (2,629)
Net Amount $ 1,248 1,613
Customer Lists | Minimum    
Finite-Lived Intangible Assets [Line Items]    
Other intangible asset, useful life 6 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 $ 28,460 28,136
Accumulated Amortization (20,126) (19,743)
Net Amount $ 8,334 8,393
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 $ 2,673 2,664
Accumulated Amortization (1,739) (1,541)
Net Amount $ 934 $ 1,123
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