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Share-Based Compensation - Equity-Classified Compensation (Details) - USD ($) $ in Millions |  | 12 Months Ended
--- | --- | ---
May 05, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
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 |  | $ 22 | $ 32 | $ 39
Restricted stock and stock options | General and administrative expenses |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based compensation expense |  | 20 | 26 | 31
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 |  | 1 | 2 | 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 |  | 1 | 3 | 5
Restricted stock and stock options | Exploration expenses |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based compensation expense |  | $ 0 | $ 1 | $ 1

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