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Retirement Plans (Schedule Of Expense Related To These Defined Contribution Plans) (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Defined Benefit Plan Disclosure [Line Items] |  |  |
Expense related to defined contribution plans | $ 69 us-gaap_DefinedContributionPlanCostRecognized | $ 67 us-gaap_DefinedContributionPlanCostRecognized | $ 59 us-gaap_DefinedContributionPlanCostRecognized
401(k) Plan And Enhanced Contribution Plans [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Expense related to defined contribution plans | 49 us-gaap_DefinedContributionPlanCostRecognized / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = dvn_FourZeroOneKPlanAndEnhancedContributionPlansMember | 41 us-gaap_DefinedContributionPlanCostRecognized / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = dvn_FourZeroOneKPlanAndEnhancedContributionPlansMember | 36 us-gaap_DefinedContributionPlanCostRecognized / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = dvn_FourZeroOneKPlanAndEnhancedContributionPlansMember
Canadian Pension And Savings Plans [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Expense related to defined contribution plans | $ 20 us-gaap_DefinedContributionPlanCostRecognized / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = dvn_CanadianPensionAndSavingsPlansMember | $ 26 us-gaap_DefinedContributionPlanCostRecognized / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = dvn_CanadianPensionAndSavingsPlansMember | $ 23 us-gaap_DefinedContributionPlanCostRecognized / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = dvn_CanadianPensionAndSavingsPlansMember

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- Definition The amount of the cost recognized during the period for defined contribution plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6414718&loc=d3e28014-114942 + Details
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