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Debt - Additional Information (Details) - USD ($)
1 Months Ended 12 Months Ended
Nov. 25, 2019
Jan. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Oct. 18, 2019
Sep. 03, 2019
Aug. 15, 2019
Debt Instrument [Line Items]              
Principal amount issued     $ 4,595,000,000 $ 4,343,000,000      
Gain (loss) on extinguishment of debt     10,000,000 73,000,000      
Debtor-in-possession financing, borrowings outstanding     148,000,000 0      
Senior Secured Note due May 1, 2024              
Debt Instrument [Line Items]              
Principal amount issued   $ 1,092,000,000   1,092,000,000      
Gain (loss) on extinguishment/modification of debt   (12,000,000)          
Gain (loss) on extinguishment of debt   $ 53,000,000          
Unsecured Debt              
Debt Instrument [Line Items]              
Gain (loss) on extinguishment of debt     10,000,000 32,000,000      
Repayments of outstanding amount     40,000,000 49,000,000      
Aggregate principal amount repurchased     50,000,000 84,000,000      
Senior Secured Notes due February 15, 2025              
Debt Instrument [Line Items]              
Principal amount issued     1,000,000,000 1,000,000,000      
Cash interest payment due, not paid             $ 40,000,000
Debt instrument, face amount         $ 138,000,000    
Senior Unsecured Notes due September 1, 2022              
Debt Instrument [Line Items]              
Principal amount issued     182,000,000 182,000,000      
Cash interest payment due, not paid           $ 7,000,000  
Debtor-In-Possession Senior Secured Superpriority Revolving Credit Facility              
Debt Instrument [Line Items]              
Debtor-in-possession financing, amount arranged $ 315,000,000            
Debtor-in possession financing, remaining borrowing capacity     150,000,000        
Debtor-in-possession financing, borrowings outstanding     148,000,000 $ 0      
Debt instrument, face amount 629,000,000            
Letter of Credit              
Debt Instrument [Line Items]              
Debtor-in possession financing, maximum borrowing capacity $ 50,000,000            
Debtor-in-possession financing, letters of credit outstanding     $ 17,000,000        
LIBOR | Debtor-In-Possession Senior Secured Superpriority Revolving Credit Facility              
Debt Instrument [Line Items]              
Debtor-In Possession Financing, basis spread on variable rate 3.50%            
Debt Instrument Variable Rate Alternate Base Rate | Debtor-In-Possession Senior Secured Superpriority Revolving Credit Facility              
Debt Instrument [Line Items]              
Debtor-In Possession Financing, basis spread on variable rate 2.50%            
Debtor-In Possession Financing, unused capacity, commitment fee percentage 0.50%