| **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 Settled                                                                                                               | $ 345           | $ 82 |
| Revisions of Estimates                                                                                                            | 293             | (65) |
| Liabilities Incurred                                                                                                              | 25              | 94 |
| Reclassification to Liabilities Associated with Assets Held for Sale                                                              | 1               | 54 |
| Gulf of Mexico assets                                                                                                             |            |   |
| **Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]** |            |   |
| Liabilities Settled                                                                                                               | 216             |   |
| Greeley Crescent DJ Basin                                                                                                         |            |   |
| **Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]** |            |   |
| Liabilities Settled                                                                                                               |            | 19 |
| Onshore US                                                                                                                        |            |   |
| **Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]** |            |   |
| Liabilities Settled                                                                                                               | 104             | 43 |
| Revisions of Estimates                                                                                                            | 287             |   |
| Wells Offshore Israel                                                                                                             |            |   |
| **Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]** |            |   |
| Revisions of Estimates                                                                                                            | 10              |   |
| Equatorial Guinea [Member]                                                                                                        |            |   |
| **Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]** |            |   |
| Revisions of Estimates                                                                                                            | 9               |   |
| North Sea                                                                                                                         |            |   |
| **Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]** |            |   |
| Revisions of Estimates                                                                                                            | (17)            | (42) |
| Greeley Crescent Assets                                                                                                           |            |   |
| **Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]** |            |   |
| Liabilities Settled                                                                                                               | $ 24            |   |
| 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 |
| US Onshore and Gulf of Mexico                                                                                                     |            |   |
| **Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]** |            |   |
| Revisions of Estimates                                                                                                            |            | (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 |
| Clayton Williams Energy                                                                                                           |            |   |
| **Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]** |            |   |
| Liabilities Incurred                                                                                                              |            | 63 |
| Onshore US                                                                                                                        |            |   |
| **Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]** |            |   |
| Liabilities Incurred                                                                                                              |            | 31 |
| West Africa                                                                                                                       |            |   |
| **Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]** |            |   |
| Revisions of Estimates                                                                                                            |            | $ 15 |

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| - Definition
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