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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)

X

- Definition

The estimated maximum amount of possible loss from the contingency.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 450

-SubTopic 20

-Section 50

-Paragraph 4

-Subparagraph (b)

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-Paragraph 9

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-URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14557-108349

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X

- Definition

The estimated minimum amount of possible loss from the contingency.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Standards Codification

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- Definition

Amount of cash payments made as the result of exit or disposal activities. Excludes payments associated with a discontinued operation or an asset retirement obligation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585

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- Definition

Date the exit and disposal activities were completed or are expected to be completed, in CCYY-MM-DD format.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 5

-Section P

-Subsection 4



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-Name Accounting Standards Codification

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-Paragraph 1

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- Definition

The expected number of positions to be eliminated as a result of restructuring activities.

+ References

No definition available.

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Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan.

+ References

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-Section S99

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-Subparagraph (SAB TOPIC 5.P.4(b))

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