Asset Retirement Obligations (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2015	Dec. 31, 2014
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Asset Retirement Obligations, Beginning Balance	$ 751	$ 586
Liabilities Incurred	67	75
Liabilities Settled	(38)	(101)
Revision of Estimate	166	155
Accretion Expense	43	36
Asset Retirement Obligations, Ending Balance	989	751
Deepwater Gulf of Mexico
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Liabilities Incurred	16	25
Liabilities Settled	(2)	(62)
Revision of Estimate	35	29
Eagle Ford Shale and Permian Delaware Basin
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Liabilities Incurred	29
Cameroon
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Liabilities Incurred		2
DJ Basin (Onshore US)
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Liabilities Settled	(23)	(33)
Revision of Estimate	96	33
Onshore US
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Liabilities Incurred	22	20
Equatorial Guinea
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Liabilities Incurred		18
Revision of Estimate	(10)	16
Eastern Mediterranean
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Liabilities Incurred		10
Revision of Estimate	48	8
Non-Core Onshore US
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Liabilities Settled		(28)
Revision of Estimate	(3)
Offshore China
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Other		1
North Sea
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Liabilities Settled	$ (13)	(23)
Revision of Estimate		$ 69

Asset Retirement Obligation, Other

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 410
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Asset Retirement Obligation
-URI http://asc.fasb.org/extlink&oid=6505190

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 410
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (c)(3)
-URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 410
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6392676&loc=d3e7480-110848

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Amount of asset retirement obligations incurred during the period.

+ References

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Amount of asset retirement obligations settled, or otherwise disposed of, during the period. This may include asset retirement obligations transferred to third parties associated with the sale of a long-lived asset.

+ References

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- Definition

Amount of the Increase or Decrease in the amount of the asset retirement obligation during the current period for changes in the amount or timing of the estimated cash flows associated with the settlement of the obligation.

+ References

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

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