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Wireless Licenses, Goodwill and Other Intangible Assets - Composition of Other Intangible Assets, Net (Detail) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Finite-Lived Intangible Assets [Line Items]    
Gross Amount $ 32,515 $ 30,562
Accumulated Amortization (21,458) (19,101)
Net Amount 11,057 11,461
Customer lists    
Finite-Lived Intangible Assets [Line Items]    
Gross Amount 4,335 4,335
Accumulated Amortization (2,193) (1,646)
Net Amount $ 2,142 2,689
Customer lists | Minimum    
Finite-Lived Intangible Assets [Line Items]    
Useful life for finite-lived intangible assets, years 5 years  
Customer lists | Maximum    
Finite-Lived Intangible Assets [Line Items]    
Useful life for finite-lived intangible assets, years 13 years  
Non-Network Internal-Use Software    
Finite-Lived Intangible Assets [Line Items]    
Useful life for finite-lived intangible assets, years 7 years  
Gross Amount $ 25,524 23,421
Accumulated Amortization (17,949) (16,397)
Net Amount 7,575 7,024
Other    
Finite-Lived Intangible Assets [Line Items]    
Gross Amount 2,656 2,806
Accumulated Amortization (1,316) (1,058)
Net Amount $ 1,340 $ 1,748
Other | Minimum    
Finite-Lived Intangible Assets [Line Items]    
Useful life for finite-lived intangible assets, years 4 years  
Other | Maximum    
Finite-Lived Intangible Assets [Line Items]    
Useful life for finite-lived intangible assets, years 25 years