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Revenue Recognition - Capitalized Contract Costs (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Acquisition Costs        
Capitalized Contract Cost [Roll Forward]        
Balance at beginning of period $ 210 $ 185 $ 203 $ 182
Costs incurred 34 36 106 104
Amortization (30) (32) (95) (97)
Change in contract costs held for sale 0   0  
Balance at End of period 214 189 214 189
Fulfillment Costs        
Capitalized Contract Cost [Roll Forward]        
Balance at beginning of period 241 204 222 184
Costs incurred 57 41 166 126
Amortization (41) (36) (117) (101)
Change in contract costs held for sale (3)   (17)  
Balance at End of period 254 $ 209 254 $ 209
Fulfillment Costs | Held for sale | Mass Markets Fiber-to-the Home Business        
Capitalized Contract Cost [Roll Forward]        
Balance at beginning of period 14      
Balance at End of period $ 17   $ 17