Impairment Analysis (Details) (Aruba Refinery [Member], USD $) In Millions	9 Months Ended
Sep. 30, 2011
Aruba Refinery [Member]
Impairment Analysis (Textual)
Impairment of long-lived assets held for use	$ 0
Net book value	$ 950

The aggregate amount of write-downs for impairments recognized during the period for long lived assets held for use (including those held for disposal by means other than sale).

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+ Details