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Debt - Senior Secured Notes (Details) - USD ($)
6 Months Ended 12 Months Ended
Apr. 10, 2019
Nov. 14, 2018
Nov. 01, 2018
Dec. 31, 2018
Jul. 01, 2018
Dec. 31, 2020
Dec. 31, 2019
Jul. 15, 2019
Oct. 10, 2018
Jul. 02, 2018
May 09, 2018
Debt Instrument [Line Items]                      
Repayments of debt       $ 83,000,000 $ 153,000,000 $ 132,000,000 $ 34,000,000        
Interest expense on debt       237,000,000 $ 37,000,000 338,000,000 440,000,000        
Total debt principal           6,177,000,000 6,759,000,000        
Cash collateral securing Senior Notes           66,000,000          
Restricted cash portion of cash collateral securing Senior Notes           197,000,000 242,000,000        
Accounts pledged as collateral for Senior Secured Notes                      
Debt Instrument [Line Items]                      
Restricted cash portion of cash collateral securing Senior Notes           30,000,000 24,000,000        
Exploration and production equipment | West Rigel                      
Debt Instrument [Line Items]                      
Fair value of consideration received                     $ 126,000,000
Secured Debt | Senior Secured Notes                      
Debt Instrument [Line Items]                      
Debt, face amount                   $ 880,000,000  
Debt instrument, interest rate (as percent)                   12.00%  
Stated interest rate, cash portion (as a percent)         4.00%         4.00%  
Stated interest rate, paid-in-kind portion (as a percent)         8.00%         8.00%  
Compounded paid-in-kind interest           39,000,000   $ 18,000,000   $ 10,000,000  
Repayments of debt $ 342,000,000 $ 100,000 $ 121,000,000                
Interest expense on debt     $ 5,000,000 $ 50,000,000 $ 0 60,000,000 66,000,000        
Tender offer, aggregate repurchase amount                 $ 56,000,000    
Repurchased principal amount 311,000,000                    
Purchase premium and accrued interest included in debt repayment $ 31,000,000                    
Premium percentage 7.00%                    
Total debt principal $ 476,000,000         $ 515,000,000 $ 476,000,000