Supplemental Quarterly Financial Information (Unaudited) (Schedule Of Unaudited Interim Results Of Operations) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended																12 Months Ended
	Dec. 31, 2019		Sep. 30, 2019		Jun. 30, 2019		Mar. 31, 2019		Dec. 31, 2018		Sep. 30, 2018		Jun. 30, 2018		Mar. 31, 2018		Dec. 31, 2019		Dec. 31, 2018		Dec. 31, 2017
Quarterly Financial Data [Abstract]
Total revenues	$ 1,589	[1]	$ 1,746	[1]	$ 1,806	[1]	$ 1,079	[1]	$ 3,530	[1]	$ 1,974	[1]	$ 1,727	[1]	$ 1,665	[1]	$ 6,220	[1]	$ 8,896	[1]	$ 6,501
Asset dispositions			(1)	[2]	(2)	[2]	(45)	[2]	(242)	[2]	(6)	[2]	(18)	[2]	(12)	[2]	(48)	[2]	(278)	[2]	(219)
Earnings (loss) from continuing operations before income taxes	(21)		190		219		(497)		1,799	[3]	(105)	[3]	(486)	[3]	(264)	[3]	(109)		944	[3]	40
Net earnings (loss) from continuing operations	12		136		151		(378)		1,378		96		(499)		(261)		(79)		714		33
Net earnings (loss) from discontinued operations, net of income tax expense (benefit)	(652)	[4]	(27)	[4]	344	[4]	61	[4]	(230)	[4]	2,469	[4]	163	[4]	108	[4]	(274)	[4]	2,510	[4]	1,045
Net earnings (loss) attributable to Devon	$ (642)		$ 109		$ 495		$ (317)		$ 1,149		$ 2,537		$ (425)		$ (197)		$ (355)		$ 3,064		$ 898
Basic net earnings (loss) per share attributable to Devon	$ (1.70)		$ 0.27		$ 1.20		$ (0.74)		$ 2.50		$ 5.17		$ (0.83)		$ (0.38)		$ (0.89)		$ 6.14		$ 1.71
Diluted net earnings (loss) per share attributable to Devon	$ (1.70)		$ 0.27		$ 1.19		$ (0.74)		$ 2.48		$ 5.14		$ (0.83)		$ (0.38)		$ (0.89)		$ 6.10		$ 1.70

[1] Includes noncash commodity hedge valuation changes of approximately $600 million loss in the first quarter of 2019 and approximately $1.4 billion gain in the fourth quarter of 2018.

[2] Additional discussion regarding asset dispositions can be found in Note 2.

[3] Includes asset impairments of approximately $150 million in the second quarter of 2018. Additional discussion regarding asset impairments can be found in Note 5.

[4] 2019 includes a $748 million asset impairment recognized in connection with the announced sale of Devon’s Barnett Shale assets in the fourth quarter of 2019. In addition, 2019 includes a gain of $425 million (after-tax) on the sale of its Canadian business during 2019, and 2018 includes a gain on sale associated with the divestment of Devon’s aggregate ownership interests in EnLink and the General Partner of approximately $2.2 billion (after-tax) in the third quarter of 2018. Additional discussion can be found in Note 18.