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Derivative Financial Instruments (Schedule Of Derivative Financial Instruments Included In The Consolidated Balance Sheets) (Details) (USD $) In Millions, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Derivatives, Fair Value [Line Items] |  |
Fair value of derivative assets | $ 2,004 us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAssetAtFairValue | $ 103 us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAssetAtFairValue
Fair value of derivative liabilities | 57 us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsLiabilityAtFairValue | 121 us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsLiabilityAtFairValue
Oil, Gas And NGL Commodity Derivatives [Member] | Other Current Assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Fair value of derivative assets | 1,967 us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAssetAtFairValue / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherCurrentAssetsMember / us-gaap_DerivativeInstrumentRiskAxis = dvn_OilGasAndNGLCommodityDerivativesMember | 75 us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAssetAtFairValue / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherCurrentAssetsMember / us-gaap_DerivativeInstrumentRiskAxis = dvn_OilGasAndNGLCommodityDerivativesMember
Oil, Gas And NGL Commodity Derivatives [Member] | Other Long-Term Assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Fair value of derivative assets | 1 us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAssetAtFairValue / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherNoncurrentAssetsMember / us-gaap_DerivativeInstrumentRiskAxis = dvn_OilGasAndNGLCommodityDerivativesMember | 28 us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAssetAtFairValue / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherNoncurrentAssetsMember / us-gaap_DerivativeInstrumentRiskAxis = dvn_OilGasAndNGLCommodityDerivativesMember
Oil, Gas And NGL Commodity Derivatives [Member] | Other Current Liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Fair value of derivative liabilities | 25 us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsLiabilityAtFairValue / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherCurrentLiabilitiesMember / us-gaap_DerivativeInstrumentRiskAxis = dvn_OilGasAndNGLCommodityDerivativesMember | 58 us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsLiabilityAtFairValue / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherCurrentLiabilitiesMember / us-gaap_DerivativeInstrumentRiskAxis = dvn_OilGasAndNGLCommodityDerivativesMember
Oil, Gas And NGL Commodity Derivatives [Member] | Other Long-Term Liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Fair value of derivative liabilities | 26 us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsLiabilityAtFairValue / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherNoncurrentLiabilitiesMember / us-gaap_DerivativeInstrumentRiskAxis = dvn_OilGasAndNGLCommodityDerivativesMember | 62 us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsLiabilityAtFairValue / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherNoncurrentLiabilitiesMember / us-gaap_DerivativeInstrumentRiskAxis = dvn_OilGasAndNGLCommodityDerivativesMember
Midstream Commodity Derivatives [Member] | Other Current Assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Fair value of derivative assets | 17 us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAssetAtFairValue / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherCurrentAssetsMember / us-gaap_DerivativeInstrumentRiskAxis = dvn_MidstreamCommodityDerivativesMember |
Midstream Commodity Derivatives [Member] | Other Long-Term Assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Fair value of derivative assets | 10 us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAssetAtFairValue / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherNoncurrentAssetsMember / us-gaap_DerivativeInstrumentRiskAxis = dvn_MidstreamCommodityDerivativesMember |
Midstream Commodity Derivatives [Member] | Other Current Liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Fair value of derivative liabilities | 3 us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsLiabilityAtFairValue / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherCurrentLiabilitiesMember / us-gaap_DerivativeInstrumentRiskAxis = dvn_MidstreamCommodityDerivativesMember |
Midstream Commodity Derivatives [Member] | Other Long-Term Liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Fair value of derivative liabilities | 2 us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsLiabilityAtFairValue / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherNoncurrentLiabilitiesMember / us-gaap_DerivativeInstrumentRiskAxis = dvn_MidstreamCommodityDerivativesMember |
Interest Rate Derivatives [Member] | Other Current Assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Fair value of derivative assets | 1 us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAssetAtFairValue / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherCurrentAssetsMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateContractMember |
Interest Rate Derivatives [Member] | Other Current Liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Fair value of derivative liabilities | 1 us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsLiabilityAtFairValue / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherCurrentLiabilitiesMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateContractMember |
Foreign Currency Derivatives [Member] | Other Current Assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Fair value of derivative assets | 8 us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAssetAtFairValue / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherCurrentAssetsMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember |
Foreign Currency Derivatives [Member] | Other Current Liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Fair value of derivative liabilities |  | $ 1 us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsLiabilityAtFairValue / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherCurrentLiabilitiesMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember

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- Definition Fair value as of the balance sheet date of derivative instrument not designated as hedging instrument and classified as an asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624163-113959 + Details
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- Definition Fair value as of the balance sheet date of derivative instrument not designated as hedging instrument and classified as a liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624163-113959 + Details
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