Asset Retirement Obligations (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2016	Dec. 31, 2015
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Asset Retirement Obligations, Beginning Balance	$ 989	$ 751
Liabilities Incurred	21	67
Liabilities Settled	(120)	(38)
Revision of Estimate	(3)	166
Accretion Expense	48	43
Asset Retirement Obligations, Ending Balance	935	989
Deepwater Gulf of Mexico
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Liabilities Incurred		16
Liabilities Settled		(2)
Revision of Estimate		35
Eagle Ford Shale and Permian Delaware Basin
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Liabilities Incurred		29
DJ Basin (Onshore US)
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Liabilities Settled		(23)
Revision of Estimate		96
Onshore US
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Liabilities Incurred		22
Equatorial Guinea
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Revision of Estimate		(10)
Eastern Mediterranean
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Revision of Estimate		48
Non-Core Onshore US
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Revision of Estimate		(3)
North Sea
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Liabilities Settled		$ (13)
Onshore US
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Liabilities Incurred	49
Deepwater Gulf of Mexico
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Liabilities Incurred	65
Tamar Field, Offshore Israel
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Liabilities Incurred	5
North Sea
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Liabilities Incurred	$ 1

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.

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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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.

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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.

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Amount of increase (decrease) in the asset retirement obligation from changes in the amount or timing of the estimated cash flows associated with the settlement of the obligation.

+ 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)(4)
-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 35
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=6392603&loc=d3e7123-110846

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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.

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