Net Earnings (Loss) Per Share Attributable To Devon (Earnings Per Share Computations) (Details) - USD ($) $ / shares in Units, shares in Millions, $ 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
Net earnings (loss):
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
Attributable to participating securities										(2)	(5)	(17)
Basic and diluted earnings (loss)										$ (3,304)	$ (14,459)	$ 1,590
Common shares:
Common shares outstanding - total										513	412	409
Attributable to participating securities										(6)	(5)	(4)
Common shares outstanding - basic										507	407	405
Dilutive effect of potential common shares issuable												2
Common shares outstanding - diluted										507	407	407
Net earnings (loss) per share attributable to Devon:
Basic		$ 0.63	$ 1.90	$ (3.04)	$ (6.44)	$ (11.12)	$ (8.64)	$ (6.94)	$ (8.88)	$ (6.52)	$ (35.55)	$ 3.93
Diluted		$ 0.63	$ 1.89	$ (3.04)	$ (6.44)	$ (11.12)	$ (8.64)	$ (6.94)	$ (8.88)	$ (6.52)	$ (35.55)	$ 3.91
Antidilutive options	[1]									3	4	3

[1] Amounts represent options to purchase shares of Devon’s common stock that are excluded from the diluted net earnings per share calculations because the options are antidilutive.