| **Divestitures (Details) $ in Millions**                                                                                          | 3 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% |   |   |
| Sales Proceeds                                                                                                                    |           | $ 238  |   | $ 119 |   |
| Alon A And Alon C [Member]                                                                                                        |           |   |   |   |   |
| **Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]** |           |   |   |   |   |
| Equity method investment, ownership percentage                                                                                    |           |   |   |   | 47.00% |
| Total transaction value                                                                                                           |           |   |   |   | $ 73 |
| 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   |   |   |   |
| Subsequent Event [Member] | Weld County, Colorado [Member]                                                                        |           |   |   |   |   |
| **Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]** |           |   |   |   |   |
| Purchase and sales agreement, area | a                                                                                            | 33,100         |   |   |   |   |
| Purchase and sales agreement, consideration                                                                                       | $ 505          |   |   |   |   |

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| X                                                                                                                                                                                                                                                                                             |
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount classified as accounts, notes and loans receivable attributable to disposal group held for sale or disposed of.
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount classified as cash and cash equivalents attributable to disposal group held for sale or disposed of.
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
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Amount of consideration received or receivable for the disposal of assets and liabilities, including discontinued operation.
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| - Definition
The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.
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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.
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The cash inflow to dispose of long-lived, physical assets and mineral interests in oil and gas properties used for normal oil and gas operations.
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