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Fresh Start Accounting - Fresh Start Adjustments (Details) - USD ($)
$ in Millions
1 Months Ended 2 Months Ended 3 Months Ended
Feb. 09, 2021
Mar. 31, 2021
Mar. 31, 2022
Reorganization, Chapter 11 [Line Items]      
AOCI, after tax $ 0    
Inflation factor 2.00%    
Average credit-adjusted risk-free rate 5.18%    
Income tax effects on accumulated other comprehensive income $ 57    
Income tax benefit 57 $ 0 $ 46
Fresh Start Adjustments      
Reorganization, Chapter 11 [Line Items]      
AOCI, after tax (48)   (9)
Income tax effects on accumulated other comprehensive income     $ 57
Senior Notes | 5.50% senior notes due 2026      
Reorganization, Chapter 11 [Line Items]      
Debt, fair value adjustments 22    
Senior Notes | 5.875% senior notes due 2029      
Reorganization, Chapter 11 [Line Items]      
Debt, fair value adjustments $ 30