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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 |  | $ 1,072 us-gaap_GainLossOnDispositionOfAssets1 | $ (9)us-gaap_GainLossOnDispositionOfAssets1 | $ 13 us-gaap_GainLossOnDispositionOfAssets1 |
Asset impairments | 1,900 us-gaap_AssetImpairmentCharges | 1,953 us-gaap_AssetImpairmentCharges | 1,976 us-gaap_AssetImpairmentCharges | 2,024 us-gaap_AssetImpairmentCharges |
Asset impairment charges, after taxes |  | 1,948 dvn_AssetImpairmentChargesAfterTax | 1,353 dvn_AssetImpairmentChargesAfterTax | 1,308 dvn_AssetImpairmentChargesAfterTax |
Asset impairment per diluted share | $ 4.79 us-gaap_ImpairmentEffectOnEarningsPerShareAfterTax |  |  |  |
United States And Canada [Member] |  |  |  |  |
Asset impairments |  |  |  |  | 1,900 us-gaap_AssetImpairmentCharges / us-gaap_StatementGeographicalAxis = dvn_UnitedStatesAndCanadaMember
Asset impairment charges, after taxes |  |  |  |  | $ 1,300 dvn_AssetImpairmentChargesAfterTax / us-gaap_StatementGeographicalAxis = dvn_UnitedStatesAndCanadaMember
Asset impairment per diluted share |  |  |  |  | $ 3.25 us-gaap_ImpairmentEffectOnEarningsPerShareAfterTax / us-gaap_StatementGeographicalAxis = dvn_UnitedStatesAndCanadaMember

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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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -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 + Details
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- Definition 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 + Details
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