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Net Earnings (Loss) Per Share from Continuing Operations (Net Earnings (Loss) Per Share Computations from Continuing Operations) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Net earnings (loss) from continuing operations:
Net earnings (loss) from continuing operations		$ 166	$ (496)	$ (180)	$ (704)
Attributable to participating securities		(2)	(1)	(1)	(1)
Basic and diluted earnings (loss) from continuing operations		$ 164	$ (497)	$ (181)	$ (705)
Common shares:
Common shares outstanding - total		415	521	425	524
Attributable to participating securities		(6)	(6)	(6)	(6)
Common shares outstanding - basic		409	515	419	518
Dilutive effect of potential common shares issuable		2
Common shares outstanding - diluted		411	515	419	518
Net earnings (loss) per share from continuing operations:
Basic		$ 0.40	$ (0.97)	$ (0.43)	$ (1.36)
Diluted		$ 0.40	$ (0.97)	$ (0.43)	$ (1.36)
Antidilutive options	[1]	1	2	1	2
[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.

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