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General - Narrative (Details) - USD ($) shares in Millions, $ in Millions | 1 Months Ended | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Mar. 31, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Jun. 30, 2021 | Dec. 31, 2020
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, Held-for-sale | Ghana Operations |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |
Income (loss) from discontinued operations |  | $ 7 |  | $ (35) |
Property, plant and equipment, net |  | 1,200 |  | 1,200 | $ 1,400
Deferred income taxes, asset retirement obligations and finance lease liability |  | $ 600 |  | $ 600 | $ 670
Discontinued Operations | Ecuador Operations |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |
Income (loss) from discontinued operations |  |  | $ (403) |  |
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% |

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