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Commitments and Contingencies (Details) (USD $) In Millions, unless otherwise specified | 1 Months Ended | 3 Months Ended
--- | --- | ---
Sep. 30, 2012 employees | Mar. 31, 2013 | Dec. 31, 2012
Commitments and Contingencies (Textual) |  |  |
Minimum range of possible loss contingency |  | $ 0 |
Maximum range of possible loss contingency |  | 250 |
Aruba Refinery [Member] |  |  |
Commitments and Contingencies (Textual) |  |  |
Number of employees notified of termination | 495 |  |
Termination date | Nov. 15, 2012 |  |
Severance liability | 41 |  |
Severance payments |  | $ (10) | $ (31)

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