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Income Taxes - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Feb. 01, 2019 | Dec. 31, 2016
Income Taxes Summary [Line Items] |  |  |  |  |  |
Deferred tax assets, valuation allowance, increase (decrease) |  | $ 206 |  |  |  |
Change in valuation allowance |  | 200 |  |  |  |
Net operating loss carryforwards |  | 1,971 | $ 2,737 |  |  |
Deferred tax assets |  | 2,449 | 3,231 |  |  |
Deferred tax assets, valuation allowance |  | 1,805 | 2,011 |  |  |
Income tax benefit |  | (331) | (10) | $ 2 |  |
Unrecognized tax benefits |  | 74 | 79 | 106 |  | $ 202
Unrecognized tax benefits, liabilities with taxing authorities |  | 32 | 0 | $ 100 |  |
Uncertain tax positions that would impact effective tax rate |  | 29 |  |  |  |
Unrecognized tax benefits, accrued liabilities |  |  | 20 |  |  |
Federal |  |  |  |  |  |
Income Taxes Summary [Line Items] |  |  |  |  |  |
NOL carryforward |  | 7,582 |  |  |  |
Net operating loss carryforwards |  | 1,592 |  |  |  |
State and local |  |  |  |  |  |
Income Taxes Summary [Line Items] |  |  |  |  |  |
NOL carryforward |  | 6,844 |  |  |  |
Net operating loss carryforwards |  | 379 |  |  |  |
Unrecognized tax benefits, receivables with taxing authorities |  | 29 | 29 |  |  |
Unrecognized tax benefits, liabilities with taxing authorities |  |  | $ 32 |  |  |
Wildhorse resource development corporation |  |  |  |  |  |
Income Taxes Summary [Line Items] |  |  |  |  |  |
Deferred tax liabilities |  |  |  |  | $ 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 |  | $ 200 |  |  |  |

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