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Background - Change in Accounting Estimates and Correction of Immaterial Errors (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2024
Jan. 01, 2024
Dec. 31, 2023
Jan. 01, 2023
Change in Accounting Estimate [Line Items]          
Retained Earnings (Accumulated Deficit) $ 1,437 $ 1,437   $ 706  
Fiber Network Assets          
Change in Accounting Estimate [Line Items]          
Property, Plant and Equipment, 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 (6) (12)      
Depreciation, Net Of Tax (4) (9)      
Competitive Local Exchange Carriers Fixed Assets | Change in Accounting Method Accounted for as Change in Estimate          
Change in Accounting Estimate [Line Items]          
Depreciation (24) (48)      
Depreciation, Net Of Tax $ (18) $ (36)      
Correction Of Error From Understatement Of Revenues And Network Expenses Prior To 2021          
Change in Accounting Estimate [Line Items]          
Retained Earnings (Accumulated Deficit)         $ 13