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Long-Term Debt (Long-Term Debt) (Details) - USD ($)
$ in Millions
4 Months Ended 8 Months Ended 12 Months Ended
Apr. 30, 2021
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Successor [Member]        
Debt Instrument [Line Items]        
Principal debt outstanding, beginning   $ 6,794    
New borrowings   1,000    
Repayment of long-term debt at maturity   (17)    
Principal debt outstanding, ending $ 6,794 7,777    
Less: Unamortized debt issuance costs   (13)    
Plus: Unamortized fair value adjustment   219    
Less: Long-term debt due within one year (15) (15)    
Carrying amount of Total debt 7,015 7,996    
Long-term debt   7,968    
Amortization   $ 18    
Weighted average interest rate   5.702%    
Predecessor [Member]        
Debt Instrument [Line Items]        
Principal debt outstanding, beginning 16,769 $ 6,794    
Issuance of incremental term loan 225      
Issuance of Takeback Notes 750      
New borrowings 225   $ 4,950 $ 1,650
Conversion of Unsecured Senior Notes (10,949)      
Repayment of long term subsidiary debt at maturity (1)      
Principal debt outstanding, ending 6,794   16,769  
Less: Unamortized debt issuance costs (2)      
Less: Unamortized premium (discount) (39)      
Less: Long-term debt due within one year (15)   (5,781)  
Carrying amount of Total debt 6,738   5,820  
Fresh start accounting fair value adjustment 277      
Long-term debt 7,015    
Long-term debt, fair value adjustment $ (236)