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Share-Based Compensation (Summary of Unvested Performance Share Units, Including Changes During the Year (Details) (Performance Share Units [Member], USD $)
3 Months Ended
Mar. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Unvested at December 31, 2014 1,477,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
Granted, units 786,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
Vested, units (337,000)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
Forfeited, units (14,000)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
Unvested at March 31, 2015 1,912,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber [1]
Unvested weighted average grant-date fair value at December 31, 2014 $ 70.90us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
Granted, weighted average grant-date fair value $ 84.14us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
Vested, weighted average grant-date fair value $ 66.00us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue
Forfeited, weighted average grant-date fair value $ 74.76us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue
Unvested weighted average grant-date fair value at March 31, 2015 $ 76.27us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue [1]
Maximum [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Granted, weighted average grant-date fair value $ 85.05us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= dvn_PerformanceShareUnitsMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
Maximum [Member] | Forecast [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Maximum common shares awarded based upon total shareholder return 3,800,000dvn_CommonSharesAwardedBasedUponTotalShareholderReturn
/ us-gaap_AwardTypeAxis
= dvn_PerformanceShareUnitsMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioForecastMember
[1] A maximum of 3.8 million common shares could be awarded based upon Devon’s final total shareholder return ranking.