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Income Taxes (Narrative) (Details) - USD ($)
$ in Millions
2 Months Ended 4 Months Ended 6 Months Ended
Jun. 30, 2021
Apr. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Income Tax Contingency [Line Items]        
Expected income refunds $ 13     $ 13
Deferred payments related to social security taxes $ 60      
Successor [Member]        
Income Tax Contingency [Line Items]        
Federal rate 21.00%      
Predecessor [Member]        
Income Tax Contingency [Line Items]        
Federal rate   21.00% 21.00%  
Valuation allowance   $ 108    
Valuation allowance, Net of federal benefit   $ 85