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Income Taxes (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 4 Months Ended 5 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Apr. 30, 2021
Sep. 30, 2021
Sep. 30, 2020
Income Tax Contingency [Line Items]          
Valuation allowance $ 111     $ 111  
Deferred payments related to social security taxes 60     60  
Valuation allowance, net of federal benefit $ 88     $ 88  
Successor [Member]          
Income Tax Contingency [Line Items]          
Federal rate 21.00%     21.00%  
Predecessor [Member]          
Income Tax Contingency [Line Items]          
Federal rate   21.00% 21.00%   21.00%