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Revenue Recognition - 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 [Line Items]        
Balance at beginning of period $ 46 $ 56 $ 51 $ 58
Cost Incurred 5 6 16 25
Amortization (7) (9) (23) (30)
Change in contract costs held for sale 0   0  
Balance at end of period 44 53 44 53
Fulfillment Costs        
Capitalized Contract Cost [Line Items]        
Balance at beginning of period 44 47 46 46
Cost Incurred 11 7 32 26
Amortization (8) (8) (25) (26)
Change in contract costs held for sale (1)   (7)  
Balance at end of period 46 $ 46 46 $ 46
Fulfillment Costs | Held-for-sale | Lumen Mass Markets fiber-to-the-home business        
Capitalized Contract Cost [Line Items]        
Balance at beginning of period 6      
Balance at end of period $ 7   $ 7