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Restructuring Costs (Narrative) (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring charges | $ 46 us-gaap_RestructuringCharges | $ 54 us-gaap_RestructuringCharges | $ 74 us-gaap_RestructuringCharges
Office Consolidation [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring costs incurred to date |  | 134 us-gaap_RestructuringAndRelatedCostCostIncurredToDate1 / us-gaap_RestructuringPlanAxis = dvn_OfficeConsolidationMember |
Offshore Divestiture [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring costs incurred to date |  |  | 196 us-gaap_RestructuringAndRelatedCostCostIncurredToDate1 / us-gaap_RestructuringPlanAxis = dvn_OffshoreDivestitureMember
Employee Related And Other Costs [Member] | Canadian Divestitures [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring charges | 46 us-gaap_RestructuringCharges / us-gaap_RestructuringCostAndReserveAxis = dvn_EmployeeRelatedAndOtherCostsMember / us-gaap_RestructuringPlanAxis = dvn_CanadaDivestitureMember |  |
Accelerated Vesting Of Share-Based Grants For Employees [Member] | Canadian Divestitures [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring charges | $ 15 us-gaap_RestructuringCharges / us-gaap_RestructuringCostAndReserveAxis = dvn_AcceleratedVestingOfStockAwardsForEmployeesMember / us-gaap_RestructuringPlanAxis = dvn_CanadaDivestitureMember |  |

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- Definition Amount of costs incurred to date for the specified restructuring cost. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section P -Subsection 3, 4 + Details
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- Definition Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation. + 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 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 5.P.3) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140864-122747 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section P -Subsection 3, 4 + Details
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