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Revenue Recognition - Governmental Funding (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended 84 Months Ended
Mar. 31, 2022
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2020
Dec. 31, 2021
Government Assistance [Line Items]            
Government Assistance, Income, Increase (Decrease), Statement of Income or Comprehensive Income [Extensible Enumeration]   OPERATING REVENUE OPERATING REVENUE      
Government funding   $ 83 $ 85      
State Universal Service Fund Support Programs            
Government Assistance [Line Items]            
Government assistance (as a percent)   18.00% 17.00%      
CAF II Program            
Government Assistance [Line Items]            
Government funding $ 59         $ 500
RDOF Phase I Program            
Government Assistance [Line Items]            
Government funding     $ 17 $ 17    
Allocated support payments   $ 16     $ 6,400  
Support payments period (in years)         10 years  
Government funding receivable         $ 17  
Government assistance, allocated support payment, each year thereafter   15        
Government assistance, liability   $ 10