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The carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees.

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Amount of accretion expense recognized during the period that is associated with an asset retirement obligation. Accretion expense measures and incorporates changes due to the passage of time into the carrying amount of the liability.

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Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Includes, but is not limited to, one-time termination benefits, termination of an operating lease or other contract, consolidating or closing facilities, and relocating employees, and termination benefits associated with an ongoing benefit arrangement. Excludes expenses associated with special or contractual termination benefits, a discontinued operation or an asset retirement obligation.

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Overall income (loss) from a disposal group that is classified as a component of the entity, before income tax, reported as a separate component of income before extraordinary items. Includes the following (before income tax): income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal.

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Amount classified as accrued liabilities attributable to disposal group held for sale or disposed of.

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Amount of sales or other form of revenues attributable to the disposal group, including a component of the entity (discontinued operation), during the reporting period.

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Discontinued Operations (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended			3 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Jun. 30, 2014	Dec. 31, 2011
Discontinued Operations (Textual)
Asset impairment losses	$ 0us-gaap_AssetImpairmentCharges	$ 0us-gaap_AssetImpairmentCharges	$ 86us-gaap_AssetImpairmentCharges
Asset retirement obligation recognized	91us-gaap_AssetRetirementObligation	31us-gaap_AssetRetirementObligation	108us-gaap_AssetRetirementObligation		87us-gaap_AssetRetirementObligation
Asset retirement obligation charged to accretion expense	1	2	5
Aruba Refinery [Member]
Selected Results of Operations of the Aruba Refinery
Operating revenues	0	0	857
Income (loss) before income taxes	(64)	6	(1,034)
Discontinued Operations (Textual)
Asset impairment losses			928
Severance costs			41
Asset retirement obligation recognized				59
Asset retirement obligation charged to accretion expense				59
Liabilities recognized for obligations under certain contracts				$ 4