v3.25.4
Summary of Significant Accounting Policies - Government Assistance and Advertising Costs (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Summary of Significant Accounting Policies    
Grant proceeds received for capital expenditures $ 24 $ 54
Government Assistance, Operating Income, Increase (Decrease) $ 5 $ 3
Government Assistance, Operating Income, Increase (Decrease), Statement of Income or Comprehensive Income [Extensible Enumeration] Revenue from Contract with Customer, Excluding Assessed Tax Revenue from Contract with Customer, Excluding Assessed Tax
Advertising costs $ 7 $ 7
Federal government grants to construct broadband    
Summary of Significant Accounting Policies    
Grant proceeds received for capital expenditures 24 54
Short-term deferred revenue 6 3
Long-term deferred revenue $ 108 $ 92
Federal government grants to construct broadband | Minimum    
Summary of Significant Accounting Policies    
Government assistance transaction duration 10 years  
Federal government grants to construct broadband | Maximum    
Summary of Significant Accounting Policies    
Government assistance transaction duration 22 years