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
		Mar. 31, 2020	Mar. 31, 2019
Net loss from continuing operations:
Net loss from continuing operations		$ (1,691)	$ (378)
Attributable to participating securities		(1)
Basic and diluted loss from continuing operations		$ (1,692)	$ (378)
Common shares:
Common shares outstanding - total		383	434
Attributable to participating securities		(6)	(6)
Common shares outstanding - basic and diluted		377	428
Net loss per share from continuing operations:
Basic		$ (4.48)	$ (0.89)
Diluted		$ (4.48)	$ (0.89)
Antidilutive options	[1]		1

[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.