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Background - Change in Accounting Estimates and Correction of Immaterial Errors (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2024
Jan. 01, 2024
Dec. 31, 2023
Jan. 01, 2023
Change in Accounting Estimate [Line Items]        
Member's equity $ 2,034   $ 3,644  
Fiber Network Assets        
Change in Accounting Estimate [Line Items]        
Useful life   30 years 25 years  
Fiber Network Assets | Change in Accounting Method Accounted for as Change in Estimate        
Change in Accounting Estimate [Line Items]        
Depreciation 7      
Depreciation, net $ 5      
Correction of Error from Understatement of Revenues and Network Expenses Prior to 2021        
Change in Accounting Estimate [Line Items]        
Member's equity       $ 23