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Share-Based Compensation (Summary Of The Grant Date Fair Values Of Performance Share Units) (Details) (Performance Share Units [Member], USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Granted, weighted average grant-date fair value | $ 77.77 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue |  |
Volatility factor | 28.80%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsWeightedAverageVolatilityRate | 30.30%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsWeightedAverageVolatilityRate | 30.30%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsWeightedAverageVolatilityRate
Contractual term (in years) | 2 years 10 months 21 days | 3 years | 3 years
Minimum [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Granted, weighted average grant-date fair value | $ 70.18 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = dvn_PerformanceShareUnitsMember / us-gaap_RangeAxis = us-gaap_MinimumMember | 61.27 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = dvn_PerformanceShareUnitsMember / us-gaap_RangeAxis = us-gaap_MinimumMember | 61.27 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = dvn_PerformanceShareUnitsMember / us-gaap_RangeAxis = us-gaap_MinimumMember
Risk-free interest rate |  | 0.26%us-gaap_FairValueAssumptionsRiskFreeInterestRate / us-gaap_AwardTypeAxis = dvn_PerformanceShareUnitsMember / us-gaap_RangeAxis = us-gaap_MinimumMember | 0.26%us-gaap_FairValueAssumptionsRiskFreeInterestRate / us-gaap_AwardTypeAxis = dvn_PerformanceShareUnitsMember / us-gaap_RangeAxis = us-gaap_MinimumMember
Maximum [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Granted, weighted average grant-date fair value | $ 81.05 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = dvn_PerformanceShareUnitsMember / us-gaap_RangeAxis = us-gaap_MaximumMember | 63.48 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = dvn_PerformanceShareUnitsMember / us-gaap_RangeAxis = us-gaap_MaximumMember | 63.48 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = dvn_PerformanceShareUnitsMember / us-gaap_RangeAxis = us-gaap_MaximumMember
Risk-free interest rate | 0.54%us-gaap_FairValueAssumptionsRiskFreeInterestRate / us-gaap_AwardTypeAxis = dvn_PerformanceShareUnitsMember / us-gaap_RangeAxis = us-gaap_MaximumMember | 0.36%us-gaap_FairValueAssumptionsRiskFreeInterestRate / us-gaap_AwardTypeAxis = dvn_PerformanceShareUnitsMember / us-gaap_RangeAxis = us-gaap_MaximumMember | 0.36%us-gaap_FairValueAssumptionsRiskFreeInterestRate / us-gaap_AwardTypeAxis = dvn_PerformanceShareUnitsMember / us-gaap_RangeAxis = us-gaap_MaximumMember

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- Definition Risk-free interest rate assumption used in valuing an instrument. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.D.2) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section D -Subsection 2 + Details
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- Definition Weighted average expected volatility rate of share-based compensation awards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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