Asset Retirement Obligations (Details) - USD ($) $ in Millions	9 Months Ended
Sep. 30, 2017	Sep. 30, 2016
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Asset Retirement Obligations, Beginning Balance	$ 935	$ 989
Liabilities Incurred	83	5
Liabilities Settled	(53)	(87)
Revision of Estimate	(56)	4
Accretion Expense	35	37
Asset Retirement Obligations, Ending Balance	944	$ 948
Onshore US
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Liabilities Incurred	25
West Africa
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Revision of Estimate	15
Clayton Williams Energy
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Liabilities Incurred	58
Onshore US
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Liabilities Settled	(37)
Marcellus Shale
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Liabilities Settled	(12)
Other Offshore International and US Properties
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Liabilities Settled	(4)
North Sea
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Revision of Estimate	42
US Onshore and Gulf of Mexico
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Revision of Estimate	$ 29

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.

+ 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

+ Details

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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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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.

+ References

No definition available.

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