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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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