v3.25.3
Goodwill, Spectrum License Transactions and Other Intangible Assets - Schedule of Other Intangible Assets and Estimated Aggregate Future Amortization Expense (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Finite-Lived Intangible Assets [Line Items]    
Gross Amount $ 9,909 $ 7,633
Accumulated Amortization (5,792) (5,121)
Net Amount 4,117 2,512
Customer relationships    
Finite-Lived Intangible Assets [Line Items]    
Gross Amount 7,597 5,427
Accumulated Amortization (4,650) (4,123)
Net Amount $ 2,947 1,304
Customer relationships | Maximum    
Finite-Lived Intangible Assets [Line Items]    
Intangible assets, useful life 10 years  
Reacquired rights    
Finite-Lived Intangible Assets [Line Items]    
Gross Amount $ 770 770
Accumulated Amortization (393) (323)
Net Amount $ 377 447
Reacquired rights | Maximum    
Finite-Lived Intangible Assets [Line Items]    
Intangible assets, useful life 9 years  
Tradenames and patents    
Finite-Lived Intangible Assets [Line Items]    
Gross Amount $ 418 338
Accumulated Amortization (179) (157)
Net Amount $ 239 181
Tradenames and patents | Maximum    
Finite-Lived Intangible Assets [Line Items]    
Intangible assets, useful life 19 years  
Favorable spectrum leases    
Finite-Lived Intangible Assets [Line Items]    
Gross Amount $ 567 620
Accumulated Amortization (177) (169)
Net Amount $ 390 451
Favorable spectrum leases | Maximum    
Finite-Lived Intangible Assets [Line Items]    
Intangible assets, useful life 27 years  
Other    
Finite-Lived Intangible Assets [Line Items]    
Gross Amount $ 557 478
Accumulated Amortization (393) (349)
Net Amount $ 164 $ 129
Other | Maximum    
Finite-Lived Intangible Assets [Line Items]    
Intangible assets, useful life 10 years