| **Fair Value Measurements and Disclosures of Assets and Liabilities Measured on a Nonrecurring Basis (Details 2) - USD ($) $ in Millions**                                                                                                                                   | 3 Months Ended |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|----------------|
||
| **Asset Impairment Charges [Abstract]**                                                                                                                                                                                                                                      |                |   |   |
| Impaired of Oil and Gas Properties                                                                                                                                                                                                                                           | [1]            | $ 0 | $ 27 |
| Oil and Gas Property, Full Cost Method, Net                                                                                                                                                                                                                                  | [2]            | 0 | 27 |
| Quoted Prices in Active Markets (Level 1)                                                                                                                                                                                                                                    |                |   |   |
| **Asset Impairment Charges [Abstract]**                                                                                                                                                                                                                                      |                |   |   |
| Impaired of Oil and Gas Properties                                                                                                                                                                                                                                           |                | 0 | 0 |
| Significant Other Observable Inputs (Level 2)                                                                                                                                                                                                                                |                |   |   |
| **Asset Impairment Charges [Abstract]**                                                                                                                                                                                                                                      |                |   |   |
| Impaired of Oil and Gas Properties                                                                                                                                                                                                                                           |                | 0 | 0 |
| Significant Unobservable Inputs (Level 3)                                                                                                                                                                                                                                    |                |   |   |
| **Asset Impairment Charges [Abstract]**                                                                                                                                                                                                                                      |                |   |   |
| Impaired of Oil and Gas Properties                                                                                                                                                                                                                                           |                | $ 0 | $ 0 |
|                                                                                                                                                                                                                                                                              |
| [1]Impairments during 2015 were related to facility costs at South Raton (Deepwater Gulf of Mexico) and increases in expected field abandonment cost for the Noa and Pinnacles fields (Eastern Mediterranean).[2]Amount represents net book value at the date of assessment. |

| X                                                                                                                                                                                                                                                      |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Oil and Gas Property, Net Book Value
+ References
No definition available.
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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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