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Long-Term Debt - 9.875% Junior-Priority Secured Notes, Due 2023 - Additional Information (Details) - Junior-Priority Secured Notes - USD ($)
$ in Millions
12 Months Ended
Feb. 02, 2021
Jun. 29, 2020
Jun. 22, 2018
Dec. 31, 2021
Dec. 31, 2020
Jun. 23, 2019
Junior-Priority Secured Notes at 9.875% Due 2023            
Debt Instrument [Line Items]            
Debt instrument, offering date       Jun. 22, 2018    
Debt instrument aggregate principal amount     $ 1,770      
Debt instrument stated interest rate 9.875%   11.00% 9.875% 9.875% 9.875%
Debt instrument redemption description       plus a “make-whole” premium, as described in the indenture governing the 9⅞% Junior-Priority Secured Notes due 2023.    
Extinguishment of debt amount       $ 2    
Tender offer commencement date       Oct. 30, 2020    
Tender offer expiration date       Nov. 30, 2020    
Junior-Priority Secured Notes at 9.875% Due 2023 | Debt Instrument, Redemption, Period One            
Debt Instrument [Line Items]            
Debt instrument redemption price percentage   109.875% 100.00%      
Maximum principal redeemable using proceeds from a public equity offering, as a percentage of principal amount   40.00%        
Junior-Priority Secured Notes at 9.875% Due 2023 | Debt Instrument, Redemption, Period Two            
Debt Instrument [Line Items]            
Minimum period notice for redemption of debt     15 days      
Maximum period notice for redemption of debt     60 days      
Junior-Priority Secured Notes at 6.875% Due 2029            
Debt Instrument [Line Items]            
Debt instrument, offering date Feb. 02, 2021          
Debt instrument aggregate principal amount $ 1,775          
Debt instrument stated interest rate 6.875%     6.875% 6.875%  
Debt instrument redemption price percentage 100.00%          
Debt instrument redemption description plus a “make-whole” premium, as described in the indenture governing the 6⅞% Junior-Priority Secured Notes due 2029          
Junior-Priority Secured Notes at 6.875% Due 2029 | Debt Instrument, Redemption, Period One            
Debt Instrument [Line Items]            
Debt instrument redemption price percentage 103.438%          
Junior-Priority Secured Notes at 6.875% Due 2029 | Debt Instrument, Redemption, Period Two            
Debt Instrument [Line Items]            
Debt instrument redemption price percentage 101.719%