| **Asset Retirement Obligations - Narrative (Details) - USD ($) $ in Millions**                                                    | 12 Months Ended |
|-----------------------------------------------------------------------------------------------------------------------------------|-----------------|
||
| **Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]** |            |   |
| Liabilities Incurred                                                                                                              | $ 94            | $ 21 |
| Liabilities Settled                                                                                                               | 82              | 120 |
| Revision of Estimate                                                                                                              | (65)            | (3) |
| Reclassification to Liabilities Associated with Assets Held for Sale                                                              | 54              | 0 |
| Onshore US                                                                                                                        |            |   |
| **Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]** |            |   |
| Liabilities Settled                                                                                                               | 43              | 49 |
| Greeley Crescent DJ Basin [Member]                                                                                                |            |   |
| **Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]** |            |   |
| Liabilities Settled                                                                                                               | 19              |   |
| Marcellus Shale                                                                                                                   |            |   |
| **Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]** |            |   |
| Liabilities Settled                                                                                                               | 12              |   |
| Other Offshore International and US Properties                                                                                    |            |   |
| **Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]** |            |   |
| Liabilities Settled                                                                                                               | 8               |   |
| North Sea                                                                                                                         |            |   |
| **Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]** |            |   |
| Liabilities Settled                                                                                                               |            | 1 |
| Revision of Estimate                                                                                                              | 42              |   |
| US Onshore and Gulf of Mexico                                                                                                     |            |   |
| **Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]** |            |   |
| Revision of Estimate                                                                                                              | (38)            |   |
| Southwest Royalties                                                                                                               |            |   |
| **Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]** |            |   |
| Reclassification to Liabilities Associated with Assets Held for Sale                                                              | 42              |   |
| Tamar Field, Offshore Israel                                                                                                      |            |   |
| **Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]** |            |   |
| Reclassification to Liabilities Associated with Assets Held for Sale                                                              | 12              |   |
| Gulf of Mexico                                                                                                                    |            |   |
| **Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]** |            |   |
| Liabilities Settled                                                                                                               |            | 65 |
| Israel                                                                                                                            |            |   |
| **Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]** |            |   |
| Liabilities Settled                                                                                                               |            | $ 5 |
| Clayton Williams Energy                                                                                                           |            |   |
| **Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]** |            |   |
| Liabilities Incurred                                                                                                              | 63              |   |
| West Africa                                                                                                                       |            |   |
| **Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]** |            |   |
| Revision of Estimate                                                                                                              | 15              |   |
| Onshore US                                                                                                                        |            |   |
| **Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]** |            |   |
| Liabilities Incurred                                                                                                              | $ 31            |   |

| X                                                                                                                                                                                                                                                                                                                                                                           |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Asset Retirement Obligation, Reclassification to Liabilities Associated With Assets Held for Sale
+ References
No definition available.
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| - Definition
Amount of asset retirement obligations incurred during the period.
+ References
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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.
+ References
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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.
+ References
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| - Definition
Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.
+ References
No definition available.
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