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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
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Derivatives, Fair Value [Line Items]
Net gain (losses) recognized in comprehensive statements of earnings	$ 2,070us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet	$ (135)us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet	$ 660us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet
Oil, Gas And NGL Commodity Derivatives [Member]
Derivatives, Fair Value [Line Items]
Net gain (losses) recognized in comprehensive statements of earnings	1,989us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet / us-gaap_DerivativeInstrumentRiskAxis = dvn_OilGasAndNGLCommodityDerivativesMember	(191)us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet / us-gaap_DerivativeInstrumentRiskAxis = dvn_OilGasAndNGLCommodityDerivativesMember	693us-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	22us-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	$ 60us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember	$ 56us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember	$ (18)us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember

X

- 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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