Supplemental Quarterly Financial Information (Schedule Of Unaudited Interim Results Of Operations) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Quarterly Financial Data [Abstract]
Total revenues and other	$ 3,350	$ 4,233	$ 2,488	$ 2,126	$ 2,886	$ 3,601	$ 3,393	$ 3,265	$ 12,197	$ 13,145	$ 20,638
Earnings (loss) before income taxes	375	1,178	(1,745)	(3,685)	(5,542)	(5,623)	(4,479)	(5,624)	(3,877)	(21,268)	4,059
Net earnings (loss) attributable to Devon	$ 331	$ 993	$ (1,570)	$ (3,056)	$ (4,532)	$ (3,507)	$ (2,816)	$ (3,599)	$ (3,302)	$ (14,454)	$ 1,607
Basic net earnings (loss) per share attributable to Devon	$ 0.63	$ 1.90	$ (3.04)	$ (6.44)	$ (11.12)	$ (8.64)	$ (6.94)	$ (8.88)	$ (6.52)	$ (35.55)	$ 3.93
Diluted net earnings (loss) per share attributable to Devon	$ 0.63	$ 1.89	$ (3.04)	$ (6.44)	$ (11.12)	$ (8.64)	$ (6.94)	$ (8.88)	$ (6.52)	$ (35.55)	$ 3.91