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Asset Retirement Obligations (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Asset Retirement Obligations, Beginning Balance	$ 377	$ 253
Liabilities Incurred	43	23
Liabilities Settled	(112)	(24)
Revision of Estimate	102	105
Accretion Expense	22	20
Other	(30)	0
Asset Retirement Obligations, Ending Balance	402	377
Offshore US [Member]
Liabilities Incurred	6
Liabilities Settled	(20)
Revision of Estimate	54
Deepwater Gulf of Mexico [Member]
Liabilities Incurred	8
Revision of Estimate	6
Offshore Israel [Member]
Liabilities Incurred	30
Revision of Estimate	26
North Sea [Member]
Liabilities Settled	(55)
Leviathan-2 Appraisal [Member]
Liabilities Settled	(34)
Offshore China [Member]
Revision of Estimate	$ 16

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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- Definition

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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