| **Divestitures (Details) $ in Millions**                                                                                          | 3 Months Ended | 6 Months Ended |        |        |        |        |
|-----------------------------------------------------------------------------------------------------------------------------------|----------------|----------------|--------|--------|--------|--------|
||
| **Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]** |           |           |   |   |   |   |   |   |
| Percentage of divestiture farmed out                                                                                              | 35.00%         |           | 35.00% |   |   |   | 35.00% |   |
| Sales Proceeds                                                                                                                    |           |           | $ 767  | $ 151  |   |   |   |   |
| Gain (Loss) on Disposition of Oil and Gas Property                                                                                | $ (23)         | $ 1            | (23)   | $ 0    |   |   |   |   |
| Bowdoin property, Northern Montana [Member]                                                                                       |           |           |   |   |   |   |   |   |
| **Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]** |           |           |   |   |   |   |   |   |
| Sales Proceeds                                                                                                                    |           |           | 43     |   |   |   |   |   |
| Gain (Loss) on Disposition of Oil and Gas Property                                                                                |           |           | 23     |   |   |   |   |   |
| Alon A And Alon C [Member]                                                                                                        |           |           |   |   |   |   |   |   |
| **Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]** |           |           |   |   |   |   |   |   |
| Total transaction value                                                                                                           |           |           |   |   |   |   |   | $ 73 |
| Percentage of divestiture farmed out                                                                                              |           |           |   |   |   |   | 47.00% |   |
| Cyprus Block 12 [Member]                                                                                                          |           |           |   |   |   |   |   |   |
| **Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]** |           |           |   |   |   |   |   |   |
| Total transaction value                                                                                                           |           |           |   |   |   |   | $ 171 |   |
| Proceeds received from farm-out agreement                                                                                         |           |           |   |   |   | $ 131  |   |   |
| Consideration subject to post-close adjustments                                                                                   |           |           |   |   |   | $ 40   |   |   |
| Certain US Crude Oil And Natural Gas Properties [Member]                                                                          |           |           |   |   |   |   |   |   |
| **Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]** |           |           |   |   |   |   |   |   |
| Sales Proceeds                                                                                                                    |           |           | 20     |   |   |   |   |   |
| Weld County, Colorado [Member]                                                                                                    |           |           |   |   |   |   |   |   |
| **Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]** |           |           |   |   |   |   |   |   |
| Purchase and sales agreement, consideration                                                                                       | $ 505          |           | 505    |   |   |   |   |   |
| Producing and Undeveloped Net Acres in the DJ Basin [Member]                                                                      |           |           |   |   |   |   |   |   |
| **Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]** |           |           |   |   |   |   |   |   |
| Sales Proceeds                                                                                                                    |           |           | $ 486  |   |   |   |   |   |
| Purchase and sales agreement, area | a                                                                                            |           |           | 33,100 |   |   |   |   |   |
| Wells Ranch Development Area [Member]                                                                                             |           |           |   |   |   |   |   |   |
| **Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]** |           |           |   |   |   |   |   |   |
| Disposal Group, Including Discontinued Operations, Purchase And Sales Agreement, Land Exchanged | a                               |           |           | 11,700 |   |   |   |   |   |
| Bronco Development Area [Member]                                                                                                  |           |           |   |   |   |   |   |   |
| **Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]** |           |           |   |   |   |   |   |   |
| Purchase and sales agreement, area | a                                                                                            |           |           | 13,500 |   |   |   |   |   |
| Subsequent Event [Member] | Tamar Field, Offshore Israel [Member]                                                                 |           |           |   |   |   |   |   |   |
| **Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]** |           |           |   |   |   |   |   |   |
| Percentage of divestiture farmed out                                                                                              |           |           |   |   | 3.00%  |   |   |   |
| Purchase and sales agreement, consideration                                                                                       |           |           |   |   | $ 369  |   |   |   |
| Disposal Group, Not Discontinued Operation, Additional Percentage Purchase Option                                                 |           |           |   |   | 1.00%  |   |   |   |

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Amount classified as cash and cash equivalents attributable to disposal group held for sale or disposed of.
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Amount of gain (loss) on sale or disposal of proven and unproven oil and gas properties.
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