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Income Taxes - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Feb. 01, 2019 | Dec. 31, 2017
Income Taxes Summary [Line Items] |  |  |  |  |  |
Change in valuation allowance |  | $ 2,010 |  |  |  |
Net operating loss carryforwards |  | 2,066 | $ 1,971 |  |  |
Deferred tax assets |  | 3,811 | 2,449 |  |  |
Deferred tax assets, valuation allowance |  | 3,808 | 1,805 |  |  |
Deferred tax assets, valuation allowance, increase (decrease) |  | 2,003 |  |  |  |
Income tax benefit |  | (19) | (331) | $ (10) |  |
Unrecognized tax benefits |  | 74 | 74 | $ 79 |  | $ 106
Uncertain tax positions that would impact effective tax rate |  | 29 |  |  |  |
Federal |  |  |  |  |  |
Income Taxes Summary [Line Items] |  |  |  |  |  |
NOL carryforward |  | 7,803 |  |  |  |
Net operating loss carryforwards |  | 1,639 |  |  |  |
State and local |  |  |  |  |  |
Income Taxes Summary [Line Items] |  |  |  |  |  |
NOL carryforward |  | 7,784 |  |  |  |
Net operating loss carryforwards |  | 427 |  |  |  |
Unrecognized tax benefits, receivables with taxing authorities |  | 29 |  |  |  |
Wildhorse resource development corporation |  |  |  |  |  |
Income Taxes Summary [Line Items] |  |  |  |  |  |
Deferred tax liabilities |  |  | $ 314 |  | $ 314 |
Income tax benefit | $ 314 |  |  |  |  |
Deferred tax liability, plant, property and equipment and prepaid compensation | 401 |  |  |  |  |
Deferred tax assets, operating loss carryforward, limitations |  | 61 |  |  |  |
Wildhorse resource development corporation | Federal |  |  |  |  |  |
Income Taxes Summary [Line Items] |  |  |  |  |  |
Net operating loss carryforwards | $ 87 |  |  |  |  |
Income tax expense (benefit) |  |  |  |  |  |
Income Taxes Summary [Line Items] |  |  |  |  |  |
Change in valuation allowance |  | $ 2,010 |  |  |  |

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