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Commitments and Contingencies (Details) (USD $) In Millions, unless otherwise specified |  | 1 Months Ended | 3 Months Ended
--- | --- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 Aruba Refinery [Member] employees | Mar. 31, 2013 Aruba Refinery [Member] | Dec. 31, 2012 Aruba Refinery [Member]
Commitments and Contingencies (Textual) |  |  |  |
Minimum range of possible loss contingency | $ 0 |  |  |
Maximum range of possible loss contingency | 200 |  |  |
Number of employees notified of termination |  | 495 |  |
Termination date |  | Nov. 15, 2012 |  |
Severance liability |  | 41 |  |
Severance payments |  |  | $ (10) | $ (31)

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