v3.25.4
Goodwill, Spectrum License Transactions and Other Intangible Assets - Schedule of Other Intangible Assets and Estimated Aggregate Future Amortization Expense (Details) - USD ($)
$ in Millions
Dec. 31, 2025
Dec. 31, 2024
Finite-Lived Intangible Assets [Line Items]    
Gross Amount $ 9,920 $ 7,633
Accumulated Amortization (6,077) (5,121)
Net Amount 3,843 2,512
Customer relationships    
Finite-Lived Intangible Assets [Line Items]    
Gross Amount 7,599 5,427
Accumulated Amortization (4,878) (4,123)
Net Amount $ 2,721 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 (416) (323)
Net Amount $ 354 447
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 $ 430 338
Accumulated Amortization (191) (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 $ 564 620
Accumulated Amortization (184) (169)
Net Amount $ 380 451
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 (408) (349)
Net Amount $ 149 $ 129
Other | Maximum    
Finite-Lived Intangible Assets [Line Items]    
Intangible assets, useful life 10 years