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Asset Impairments (Summary of Asset Impairments) (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |  |
Goodwill, Impairment Loss |  | $ 1,941 us-gaap_GoodwillImpairmentLoss | $ 0 us-gaap_GoodwillImpairmentLoss | $ 0 us-gaap_GoodwillImpairmentLoss
Goodwill, Impairment Loss, Net of Tax |  | 1,941 us-gaap_GoodwillImpairmentLossNetOfTax |  |
Asset impairment charges, gross | 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
U.S. Oil And Gas Assets [Member] |  |  |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |  |
Asset impairment charges, gross |  |  | 1,110 us-gaap_AssetImpairmentCharges / us-gaap_ImpairedLongLivedAssetsHeldAndUsedByTypeAxis = dvn_USOilAndGasAssetsMember | 1,793 us-gaap_AssetImpairmentCharges / us-gaap_ImpairedLongLivedAssetsHeldAndUsedByTypeAxis = dvn_USOilAndGasAssetsMember
Asset impairment charges, after taxes |  |  | 707 dvn_AssetImpairmentChargesAfterTax / us-gaap_ImpairedLongLivedAssetsHeldAndUsedByTypeAxis = dvn_USOilAndGasAssetsMember | 1,142 dvn_AssetImpairmentChargesAfterTax / us-gaap_ImpairedLongLivedAssetsHeldAndUsedByTypeAxis = dvn_USOilAndGasAssetsMember
Canada Oil And Gas Assets [Member] |  |  |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |  |
Asset impairment charges, gross |  |  | 843 us-gaap_AssetImpairmentCharges / us-gaap_ImpairedLongLivedAssetsHeldAndUsedByTypeAxis = dvn_CanadaOilAndGasAssetsMember | 163 us-gaap_AssetImpairmentCharges / us-gaap_ImpairedLongLivedAssetsHeldAndUsedByTypeAxis = dvn_CanadaOilAndGasAssetsMember
Asset impairment charges, after taxes |  |  | 632 dvn_AssetImpairmentChargesAfterTax / us-gaap_ImpairedLongLivedAssetsHeldAndUsedByTypeAxis = dvn_CanadaOilAndGasAssetsMember | 122 dvn_AssetImpairmentChargesAfterTax / us-gaap_ImpairedLongLivedAssetsHeldAndUsedByTypeAxis = dvn_CanadaOilAndGasAssetsMember
Midstream Assets [Member] |  |  |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |  |
Asset impairment charges, gross |  | 12 us-gaap_AssetImpairmentCharges / us-gaap_ImpairedLongLivedAssetsHeldAndUsedByTypeAxis = dvn_MidstreamAssetsMember | 23 us-gaap_AssetImpairmentCharges / us-gaap_ImpairedLongLivedAssetsHeldAndUsedByTypeAxis = dvn_MidstreamAssetsMember | 68 us-gaap_AssetImpairmentCharges / us-gaap_ImpairedLongLivedAssetsHeldAndUsedByTypeAxis = dvn_MidstreamAssetsMember
Asset impairment charges, after taxes |  | $ 7 dvn_AssetImpairmentChargesAfterTax / us-gaap_ImpairedLongLivedAssetsHeldAndUsedByTypeAxis = dvn_MidstreamAssetsMember | $ 14 dvn_AssetImpairmentChargesAfterTax / us-gaap_ImpairedLongLivedAssetsHeldAndUsedByTypeAxis = dvn_MidstreamAssetsMember | $ 44 dvn_AssetImpairmentChargesAfterTax / us-gaap_ImpairedLongLivedAssetsHeldAndUsedByTypeAxis = dvn_MidstreamAssetsMember

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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 loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + 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 350 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13854-109267 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13777-109266 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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- Definition Amount after tax of loss recognized that results from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References No definition available. + Details
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