v3.26.1
Revenue Recognition - Contract Costs (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Acquisition Costs    
Capitalized Contract Cost [Line Items]    
Beginning of period balance $ 35 $ 51
Cost incurred 3 5
Amortization (6) (8)
Change in contract costs held for sale (8)  
End of period balance 24 48
Acquisition Costs | Held-for-sale | Lumen Mass Markets fiber-to-the-home business    
Capitalized Contract Cost [Line Items]    
Beginning of period balance 6  
Fulfillment Costs    
Capitalized Contract Cost [Line Items]    
Beginning of period balance 48 46
Cost incurred 11 9
Amortization (8) (8)
Change in contract costs held for sale 0  
End of period balance 51 $ 47
Fulfillment Costs | Held-for-sale | Lumen Mass Markets fiber-to-the-home business    
Capitalized Contract Cost [Line Items]    
Beginning of period balance $ 7  
Mass Markets Customers | Weighted Average    
Capitalized Contract Cost [Line Items]    
Length of customer life 50 months  
Business Customers | Weighted Average    
Capitalized Contract Cost [Line Items]    
Length of customer life 38 months