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

No definition available.

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Period Type:	duration

- Definition

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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-Glossary Antidilution

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-Glossary Diluted Earnings Per Share

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- Definition

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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- Definition

The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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- Definition

This element represents nonvested share-based payment awards that contain non-forfeitable rights to dividends or dividend equivalents (whether paid or unpaid). Basic and dilutive earnings per share are generally disclosed for such shares using the two-class method.

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-Glossary Participating Security

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- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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-Glossary Other Comprehensive Income

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- Definition

Net income after adjustments for dividends on preferred stock (declared in the period) and/or cumulative preferred stock (accumulated for the period).

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- Definition

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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- Definition

Amount of earnings (loss) distributed and earnings (loss) allocated to participating securities for the basic earnings (loss) per share or per unit calculation under the two-class method.

+ References

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- Definition

The sum of dilutive potential common shares or units used in the calculation of the diluted per-share or per-unit computation.

+ References

+ Details

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Data Type:	xbrli:sharesItemType
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Period Type:	duration

- Definition

The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

+ References

+ Details

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- Definition

Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

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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								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
Net earnings (loss) per share attributable to Devon:
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
Net earnings (loss) attributable to Devon, Common Shares									409	406	404
Attributable to participating securities, Earnings (loss)									(17)	(2)	(3)
Attributable to participating securities, Common Shares									(4)	(4)	(4)
Basic net earnings (loss) per share, Earnings (loss)									1,590	(22)	(209)
Basic net earnings (loss) per share, Common Shares									405	402	400
Basic net earnings (loss) per share	$ (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
Dilutive effect of potential common shares issuable, Common Shares									2
Diluted net earnings (loss) per share, Earnings (loss)									$ 1,590	$ (22)	$ (209)
Diluted net earnings (loss) per share, Common Shares									407	402	400
Diluted net earnings (loss) per share	$ (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
Antidilutive securities excluded from computation of earnings per share, amount									3	7	9