| **Divestitures (Details) (USD $)In Millions, unless otherwise specified**                                                         | 3 Months Ended |
|-----------------------------------------------------------------------------------------------------------------------------------|----------------|
||
| **Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]** |           |   |
| Sales Proceeds                                                                                                                    | $ 92           | $ 76 |
| Asset Retirement Obligations Associated with Assets Sold                                                                          | 14             | 10 |
| Loss on Divestitures                                                                                                              | (1)            | 15 |
| **Discontinued Operation, Income (Loss) from Discontinued Operation Disclosures [Abstract]**                                      |           |   |
| Discontinued Operations, Net of Tax                                                                                               | 0              | 29 |
| North Sea Assets Sold [Member]                                                                                                    |           |   |
| **Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]** |           |   |
| Sales Proceeds                                                                                                                    |           | 38 |
| **Discontinued Operation, Income (Loss) from Discontinued Operation Disclosures [Abstract]**                                      |           |   |
| Oil and Gas Sales                                                                                                                 |           | 10 |
| Income Before Income Taxes                                                                                                        |           | (1) |
| Income Tax Expense                                                                                                                |           | 7 |
| Operating Income (Loss), Net of Tax                                                                                               |           | (8) |
| Gain on Sale, Net of Tax                                                                                                          |           | 37 |
| Discontinued Operations, Net of Tax                                                                                               |           | 29 |
| US Onshore Assets Sold [Member]                                                                                                   |           |   |
| **Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]** |           |   |
| Sales Proceeds                                                                                                                    | 92             |   |
| Net Book Value of Assets Sold                                                                                                     | (106)          |   |
| Goodwill Allocated to Assets Sold                                                                                                 | (6)            |   |
| Asset Retirement Obligations Associated with Assets Sold                                                                          | 20             |   |
| Other Closing Adjustments                                                                                                         | (1)            |   |
| Loss on Divestitures                                                                                                              | $ (1)          |   |

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| - Definition
For the disposal group, obligations not otherwise itemized.
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Write-off of the carrying amount (book value) associated with assets sold in 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 gain (loss), after tax expense or benefit and not previously recognized, resulting from the sale of a business component.
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Overall income (loss) from a disposal group that is classified as a component of the entity, before income tax, reported as a separate component of income before extraordinary items. Includes the following (before income tax): income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal.
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Tax effect allocated to a disposal group that is classified as a component of the entity reported as a separate component of income before extraordinary items. Includes the tax effects of the following: income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal.
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| - Definition
Amount of sales or other form of revenues attributable to the disposal group, including a component of the entity (discontinued operation), during the reporting period.
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| - Definition
Amount of gain (loss) on sale or disposal of proven and unproven oil and gas properties.
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| - Definition
Amount of divestiture of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.
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| - Definition
Amount of income (loss) from a disposal group, net of income tax before extraordinary items allocable to noncontrolling interests. Includes, net of tax, income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal.
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Amount of income (loss) from a disposal group, net of income tax, reported as a separate component of income before extraordinary items after deduction or consideration of the amount allocable to noncontrolling interests. Includes, net of tax, income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal.
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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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