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Income Taxes - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Mar. 31, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Business Acquisition [Line Items] |  |  |  |  |  |
Effective income tax rate | 0.10% |  |  |  |  |
Deferred income tax expense |  | $ 10 |  |  | $ (10) | $ (314)
Deferred tax liabilities |  | $ 10 |  |  |  |
Income tax benefit | $ 0 |  | $ 1 |  | $ 13 | $ 315
Ownership change, cumulative shift |  |  |  |  | 40.00% |
Wildhorse Resource Development Corporation |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Deferred tax liabilities |  |  |  | $ 314 |  |
Income tax benefit |  |  |  | 314 | $ 13 |
Deferred tax liability, plant, property and equipment and prepaid compensation |  |  |  | 401 |  |
Deferred tax asset, operating loss carryforward, limitations | $ 61 |  |  |  | $ 61 |
Wildhorse Resource Development Corporation | Federal |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Deferred tax asset, operating loss carryforward |  |  |  | $ 87 |  |

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