| **Asset Retirement Obligations - Narrative (Details) - USD ($) $ in Millions**                                                    | 9 Months Ended |
|-----------------------------------------------------------------------------------------------------------------------------------|----------------|
||
| **Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]** |           |   |
| Liabilities Settled                                                                                                               | $ 309          | $ 53 |
| (Increase) decrease of estimates                                                                                                  | (67)           | 56 |
| Liabilities Incurred                                                                                                              | 16             | 83 |
| Gulf of Mexico properties                                                                                                         |           |   |
| **Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]** |           |   |
| Liabilities Settled                                                                                                               | 216            |   |
| Greeley Crescent assets                                                                                                           |           |   |
| **Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]** |           |   |
| Liabilities Settled                                                                                                               | 24             |   |
| Onshore US                                                                                                                        |           |   |
| **Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]** |           |   |
| Liabilities Settled                                                                                                               | 69             | 37 |
| (Increase) decrease of estimates                                                                                                  | (84)           |   |
| North Sea abandonment project                                                                                                     |           |   |
| **Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]** |           |   |
| (Increase) decrease of estimates                                                                                                  | 11             | 42 |
| Wells offshore Israel                                                                                                             |           |   |
| **Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]** |           |   |
| (Increase) decrease of estimates                                                                                                  | $ 6            |   |
| Other US onshore wells and facilities placed into service                                                                         |           |   |
| **Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]** |           |   |
| Liabilities Incurred                                                                                                              |           | 25 |
| Marcellus Shale upstream divestiture                                                                                              |           |   |
| **Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]** |           |   |
| Liabilities Settled                                                                                                               |           | 12 |
| Other offshore international and US properties [Member]                                                                           |           |   |
| **Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]** |           |   |
| Liabilities Settled                                                                                                               |           | 4 |
| US onshore and Gulf Of Mexico                                                                                                     |           |   |
| **Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]** |           |   |
| (Increase) decrease of estimates                                                                                                  |           | 29 |
| West Africa                                                                                                                       |           |   |
| **Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]** |           |   |
| (Increase) decrease of estimates                                                                                                  |           | (15) |
| Clayton Williams Energy                                                                                                           |           |   |
| **Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]** |           |   |
| Liabilities Incurred                                                                                                              |           | $ 58 |

| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of asset retirement obligations incurred during the period.
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| - Definition
Amount of asset retirement obligations settled, or otherwise disposed of, during the period. This may include asset retirement obligations transferred to third parties associated with the sale of a long-lived asset.
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| - Definition
Amount of increase (decrease) in the asset retirement obligation from changes in the amount or timing of the estimated cash flows associated with the settlement of the obligation.
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