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Fresh Start Accounting - Debt and Warrants (Details) - USD ($)
Mar. 31, 2021
Feb. 09, 2021
Jun. 28, 2020
Debt Instrument [Line Items]      
Debt instrument, principal amount   $ 1,000,000,000  
Implied stock price (in dollars per share)   $ 20.52  
Expected volatility rate   58.00%  
Class A Warrants      
Debt Instrument [Line Items]      
Warrant, exercise price (in dollars per share)   $ 27.63  
Class B Warrants      
Debt Instrument [Line Items]      
Warrant, exercise price (in dollars per share)   32.13  
Class C Warrants      
Debt Instrument [Line Items]      
Warrant, exercise price (in dollars per share)   $ 36.18  
5.5% senior notes due 2026      
Debt Instrument [Line Items]      
Interest rate, stated percentage 5.50%    
Senior Notes | 5.5% senior notes due 2026      
Debt Instrument [Line Items]      
Debt instrument, principal amount   $ 500,000,000  
Interest rate, stated percentage 0.055% 5.50%  
Senior Notes | 5.875% senior notes due 2029      
Debt Instrument [Line Items]      
Debt instrument, principal amount   $ 500,000,000  
Interest rate, stated percentage 0.05875% 5.875%  
Term Loan | Debtor-in-Possession Credit Agreement      
Debt Instrument [Line Items]      
Debt     $ 1,179,000,000
Secured Debt | Debtor-in-Possession Credit Agreement      
Debt Instrument [Line Items]      
Exit credit facilities borrowing capacity     $ 750,000,000