Net Earnings (Loss) Per Share Attributable To Devon (Earnings Per Share Computations) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Net earnings (loss) per share attributable to Devon:
Net earnings (loss) attributable to Devon	$ (3,599)us-gaap_NetIncomeLoss	$ 324us-gaap_NetIncomeLoss
Net earnings (loss) attributable to Devon, Common Shares	410	407
Attributable to participating securities, Earnings (loss)	(1)	(2)
Attributable to participating securities, Common Shares	(4)	(4)
Basic net earnings (loss) per share, Earnings (loss)	(3,600)	322
Basic net earnings (loss) per share, Common Shares	406	403
Basic net earnings (loss) per share	$ (8.88)us-gaap_EarningsPerShareBasic	$ 0.80us-gaap_EarningsPerShareBasic
Dilutive effect of potential common shares issuable, Common Shares		2
Diluted net earnings (loss) per share, Earnings (loss)	$ (3,600)	$ 322
Diluted net earnings (loss) per share, Common Shares	406	405
Diluted net earnings (loss) per share	$ (8.88)us-gaap_EarningsPerShareDiluted	$ 0.79us-gaap_EarningsPerShareDiluted
Antidilutive securities excluded from the computation of net earnings (loss) per share, amount	4.1	6.3

Weighted Average Number Of Shares Outstanding Basic Before Exclusion Of Antidilutive Securities.

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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Net Income or Loss Available to Common Stockholders plus adjustments resulting from the assumption that dilutive convertible securities were converted, options or warrants were exercised, or that other shares were issued upon the satisfaction of certain conditions.

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