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Supplemental Quarterly Financial Information (Schedule Of Unaudited Interim Results Of Operations) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Quarterly Financial Data [Abstract]
Operating revenues	$ 5,995us-gaap_Revenues	$ 5,336us-gaap_Revenues	$ 4,510us-gaap_Revenues	$ 3,725us-gaap_Revenues	$ 2,624us-gaap_Revenues	$ 2,714us-gaap_Revenues	$ 3,088us-gaap_Revenues	$ 1,971us-gaap_Revenues	$ 19,566us-gaap_Revenues	$ 10,397us-gaap_Revenues	$ 9,501us-gaap_Revenues
Earnings (loss) before income taxes	291us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	1,654us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	1,554us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	560us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	475us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	639us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	997us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	(1,962)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	4,059us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	149us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	(317)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Net earnings (loss) attributable to Devon	$ (408)us-gaap_NetIncomeLoss	$ 1,016us-gaap_NetIncomeLoss	$ 675us-gaap_NetIncomeLoss	$ 324us-gaap_NetIncomeLoss	$ 207us-gaap_NetIncomeLoss	$ 429us-gaap_NetIncomeLoss	$ 683us-gaap_NetIncomeLoss	$ (1,339)us-gaap_NetIncomeLoss	$ 1,607us-gaap_NetIncomeLoss	$ (20)us-gaap_NetIncomeLoss	$ (206)us-gaap_NetIncomeLoss
Basic net earnings (loss) per share attributable to Devon	$ (1.01)us-gaap_EarningsPerShareBasic	$ 2.48us-gaap_EarningsPerShareBasic	$ 1.65us-gaap_EarningsPerShareBasic	$ 0.80us-gaap_EarningsPerShareBasic	$ 0.51us-gaap_EarningsPerShareBasic	$ 1.06us-gaap_EarningsPerShareBasic	$ 1.69us-gaap_EarningsPerShareBasic	$ (3.34)us-gaap_EarningsPerShareBasic	$ 3.93us-gaap_EarningsPerShareBasic	$ (0.06)us-gaap_EarningsPerShareBasic	$ (0.52)us-gaap_EarningsPerShareBasic
Diluted net earnings (loss) per share attributable to Devon	$ (1.01)us-gaap_EarningsPerShareDiluted	$ 2.47us-gaap_EarningsPerShareDiluted	$ 1.64us-gaap_EarningsPerShareDiluted	$ 0.79us-gaap_EarningsPerShareDiluted	$ 0.51us-gaap_EarningsPerShareDiluted	$ 1.05us-gaap_EarningsPerShareDiluted	$ 1.68us-gaap_EarningsPerShareDiluted	$ (3.34)us-gaap_EarningsPerShareDiluted	$ 3.91us-gaap_EarningsPerShareDiluted	$ (0.06)us-gaap_EarningsPerShareDiluted	$ (0.52)us-gaap_EarningsPerShareDiluted

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