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Background - Change in Accounting Estimates and Correction of Immaterial Errors (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2024
Jan. 01, 2024
Dec. 31, 2023
Sep. 30, 2023
Jan. 01, 2023
Change in Accounting Estimate [Line Items]            
Member's equity $ 1,877 $ 1,877   $ 3,644    
Change in Accounting Method Accounted for as Change in Estimate            
Change in Accounting Estimate [Line Items]            
Depreciation (6) (5)        
Depreciation, net $ (20) $ (15)        
Fiber Network Assets            
Change in Accounting Estimate [Line Items]            
Useful life     30 years 25 years    
Correction of Error from Understatement of Revenues and Network Expenses Prior to 2021            
Change in Accounting Estimate [Line Items]            
Member's equity         $ (23) $ (23)