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Asset Retirement Obligations (Summary Of Changes In Asset Retirement Obligations) (Details) - USD ($) $ in Millions		9 Months Ended
		Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Dec. 31, 2014	Sep. 30, 2014
Asset Retirement Obligations [Line Items]
Asset retirement obligations as of beginning of period		$ 1,399	$ 2,228
Liabilities incurred		46	79
Liabilities settled and divested	[1]	(48)	(987)
Revision of estimated obligation		62	75
Accretion expense on discounted obligation		56	70
Foreign currency translation adjustment		(80)	(55)
Asset retirement obligations as of end of period		$ 1,399	2,228	$ 1,435	$ 1,399	$ 1,410
Less current portion				58		62
Asset retirement obligations, long-term				$ 1,377	$ 1,339	$ 1,348
Canadian And U.S. Oil And Gas Properties [Member]
Asset Retirement Obligations [Line Items]
Liabilities settled and divested			$ (949)
[1] During the first nine months of 2014, Devon reduced its asset retirement obligations by $949 million related to its asset divestiture program discussed in Note 2.

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Asset Retirement Obligations [Line Items]

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The carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees.

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Amount of accretion expense recognized during the period that is associated with an asset retirement obligation. Accretion expense measures and incorporates changes due to the passage of time into the carrying amount of the liability.

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Current portion of the carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees.

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Amount of the Increase or Decrease in the amount of asset retirement obligations for the period associated with foreign currency translation (to the extent that the entity accounts for the foreign currency effects as a separate component of the change in the liability).

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Noncurrent portion of the carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees.

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