| **Fair Value Measurements and Disclosures of Assets and Liabilities Measured on a Nonrecurring Basis (Details 2) - USD ($)** | 3 Months Ended | 9 Months Ended |
|------------------------------------------------------------------------------------------------------------------------------|----------------|----------------|
||
| **Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]**                             |                |           |   |   |   |
| Inventory Write-down                                                                                                         |                | $ 14,000,000   | $ 0 | $ 14,000,000 | $ 0 |
| Asset Impairment Charges                                                                                                     |                |           |   | 0 |   |
| **Asset Impairment Charges [Abstract]**                                                                                      |                |           |   |   |   |
| Impaired of Oil and Gas Properties                                                                                           |                | 0              | 0 | 0 | 43,000,000 |
| Impairment Of Materials And Supply Inventory                                                                                 |                |           |   | 14,000,000 |   |
| Assets Held For Sale, Net Book Value                                                                                         |                | 65,000,000     |   | 65,000,000 |   |
| Impairments On Assets Held For Sale                                                                                          |                |           |   | 23,000,000 |   |
| Material and Supply Inventory, Net Book Value                                                                                |                |           |   | 105,000,000 |   |
| Oil and Gas Property, Full Cost Method, Net                                                                                  | [1]            |           |   | 0 | 43,000,000 |
| Gain (Loss) on Disposition of Oil and Gas Property                                                                           |                | 0              | $ 0 | (23,000,000) | 0 |
| Quoted Prices in Active Markets (Level 1)                                                                                    |                |           |   |   |   |
| **Asset Impairment Charges [Abstract]**                                                                                      |                |           |   |   |   |
| Impaired of Oil and Gas Properties                                                                                           |                |           |   | 0 | 0 |
| Impairment Of Materials And Supply Inventory                                                                                 |                |           |   | 0 |   |
| Loss On Assets Held For Sale                                                                                                 |                | 0              |   | 0 |   |
| Significant Other Observable Inputs (Level 2)                                                                                |                |           |   |   |   |
| **Asset Impairment Charges [Abstract]**                                                                                      |                |           |   |   |   |
| Impaired of Oil and Gas Properties                                                                                           |                |           |   | 0 | 0 |
| Impairment Of Materials And Supply Inventory                                                                                 |                |           |   | 0 |   |
| Loss On Assets Held For Sale                                                                                                 |                | 0              |   | 0 |   |
| Significant Unobservable Inputs (Level 3)                                                                                    |                |           |   |   |   |
| **Asset Impairment Charges [Abstract]**                                                                                      |                |           |   |   |   |
| Impaired of Oil and Gas Properties                                                                                           |                |           |   | 0 | $ 0 |
| Impairment Of Materials And Supply Inventory                                                                                 |                |           |   | 91,000,000 |   |
| Loss On Assets Held For Sale                                                                                                 |                | $ 42,000,000   |   | $ 42,000,000 |   |
|                                                                                                                              |
| [1]Amount represents net book value at the date of assessment.                                                               |

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Loss On Assets Held For Sale
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| X                                                                                                                                                                                                                                                      |
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.
+ 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.
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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
The expense recorded to reduce the value of oil and gas assets consisting of proved properties and unproved properties as the estimate of future successful production from these properties is reduced.
+ References
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| - Definition
Amount of loss from reductions in inventory due to subsequent measurement adjustments, including, but not limited to, physical deterioration, obsolescence, or changes in price levels.
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