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Derivative Financial Instruments (Schedule Of Derivative Financial Instruments Included In The Consolidated Comprehensive Statements Of Earnings) (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Derivatives, Fair Value [Line Items] |  |  |
Net gain (losses) recognized in comprehensive statements of earnings | $ 2,070 us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet | $ (135)us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet | $ 660 us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet
Oil, Gas And NGL Commodity Derivatives [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Net gain (losses) recognized in comprehensive statements of earnings | 1,989 us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet / us-gaap_DerivativeInstrumentRiskAxis = dvn_OilGasAndNGLCommodityDerivativesMember | (191)us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet / us-gaap_DerivativeInstrumentRiskAxis = dvn_OilGasAndNGLCommodityDerivativesMember | 693 us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet / us-gaap_DerivativeInstrumentRiskAxis = dvn_OilGasAndNGLCommodityDerivativesMember
Midstream Commodity Derivatives [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Net gain (losses) recognized in comprehensive statements of earnings | 22 us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet / us-gaap_DerivativeInstrumentRiskAxis = dvn_MidstreamCommodityDerivativesMember |  |
Interest Rate Derivatives [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Net gain (losses) recognized in comprehensive statements of earnings | (1)us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateContractMember |  | (15)us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateContractMember
Foreign Currency Derivatives [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Net gain (losses) recognized in comprehensive statements of earnings | $ 60 us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember | $ 56 us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember | $ (18)us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember

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- Definition Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624171-113959 + Details
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