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Supplemental Quarterly Financial Information (Narrative) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended	12 Months Ended			3 Months Ended
	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Mar. 31, 2013
Gain on sale of assets		$ 1,072us-gaap_GainLossOnDispositionOfAssets1	$ (9)us-gaap_GainLossOnDispositionOfAssets1	$ 13us-gaap_GainLossOnDispositionOfAssets1
Asset impairments	1,900us-gaap_AssetImpairmentCharges	1,953us-gaap_AssetImpairmentCharges	1,976us-gaap_AssetImpairmentCharges	2,024us-gaap_AssetImpairmentCharges
Asset impairment charges, after taxes		1,948dvn_AssetImpairmentChargesAfterTax	1,353dvn_AssetImpairmentChargesAfterTax	1,308dvn_AssetImpairmentChargesAfterTax
Asset impairment per diluted share	$ 4.79us-gaap_ImpairmentEffectOnEarningsPerShareAfterTax
United States And Canada [Member]
Asset impairments					1,900us-gaap_AssetImpairmentCharges / us-gaap_StatementGeographicalAxis = dvn_UnitedStatesAndCanadaMember
Asset impairment charges, after taxes					$ 1,300dvn_AssetImpairmentChargesAfterTax / us-gaap_StatementGeographicalAxis = dvn_UnitedStatesAndCanadaMember
Asset impairment per diluted share					$ 3.25us-gaap_ImpairmentEffectOnEarningsPerShareAfterTax / us-gaap_StatementGeographicalAxis = dvn_UnitedStatesAndCanadaMember

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- Definition

Asset impairment charges after tax.

+ References

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- Definition

Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585



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-Publisher FASB

-Name Accounting Standards Codification

-Topic 360

-SubTopic 10

-Section 45

-Paragraph 4

-URI http://asc.fasb.org/extlink&oid=8077374&loc=d3e2420-110228

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Amount of gain (loss) on sale or disposal of assets, including but not limited to property plant and equipment, intangible assets and equity in securities of subsidiaries or equity method investee.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 360

-SubTopic 10

-Section 45

-Paragraph 5

-URI http://asc.fasb.org/extlink&oid=8077374&loc=d3e2443-110228

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After tax earnings per share or per unit impact arising from asset impairment.

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