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Share-Based Compensation - Equity-Classified Compensation Table (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
May 05, 2020
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based compensation expense $ 18        
Restricted stock and stock options          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based compensation expense   $ 7 $ 8 $ 17 $ 26
Restricted stock and stock options | General and administrative expenses          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based compensation expense   7 6 15 21
Restricted stock and stock options | Oil and natural gas properties          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based compensation expense   0 1 1 2
Restricted stock and stock options | Oil, natural gas and NGL production expenses          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based compensation expense   $ 0 $ 1 $ 1 $ 3