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Impairment (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Mar. 31, 2012 | Mar. 31, 2011 | Dec. 31, 2011
Impairment (Textual) |  |  |
Long-lived assets, carrying value | $ 25,155 |  | $ 25,177
Asset impairment loss | 611 | 0 |
Aruba Refinery [Member] |  |  |
Impairment (Textual) |  |  |
Non-binding purchase offer | 350 |  |
Long-lived assets, fair value | 350 |  |
Long-lived assets, carrying value | 945 |  |
Asset impairment loss | $ 595 |  |

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