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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, 2019
Dec. 31, 2017
Oct. 10, 2018
Jul. 02, 2018
May 09, 2018
Debt Instrument [Line Items]                    
Repayments of debt       $ 83,000,000 $ 153,000,000 $ 34,000,000 $ 754,000,000      
Interest expense on debt       237,000,000 $ 37,000,000 440,000,000 286,000,000      
Total debt principal       7,086,000,000   6,759,000,000        
Sale of West Rigel                    
Debt Instrument [Line Items]                    
Fair value of consideration received             126,000,000      
Exploration and production equipment | Sale of 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                 $ 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 66,000,000 $ 0      
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     $ 769,000,000   $ 476,000,000