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General - Narrative (Details) - USD ($) shares in Millions, $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2021 | Dec. 31, 2020
WES Midstream segment |  |
Summary of Significant Accounting Policies [Line Items] |  |
Non-voting general partner interest | 2.00% |
Limited partner interest | 49.10% |
Non-voting limited partner interest | 2.00% |
Effective economic interest | 51.20% |
Discontinued Operations, Held-for-sale | Ghana Operations |  |
Summary of Significant Accounting Policies [Line Items] |  |
Loss from discontinued operations | $ 42 |
Property, plant and equipment, net | 1,200 | $ 1,400
Deferred income taxes, asset retirement obligations and finance lease liability | $ 607 | $ 670
Disposed of by Sale, Not Discontinued Operations | WES Midstream segment |  |
Summary of Significant Accounting Policies [Line Items] |  |
Number of limited partner units sold (in units) | 11.5 |
Proceeds from sale of limited partner units | $ 200 |
Gain on sale | 102 |
Discontinued Operations | Ecuador Operations |  |
Summary of Significant Accounting Policies [Line Items] |  |
Loss from discontinued operations | $ 403 |

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