Consolidated Statements of Comprehensive Earnings - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Revenues		$ 4,673	$ 6,674	$ 8,439
Oil, gas and NGL derivatives		155	(454)	457
Total revenues		4,828	6,220	8,896
Production expenses		1,123	1,197	1,153
Exploration expenses		167	58	128
Depreciation, depletion and amortization		1,300	1,497	1,228
Asset impairments		2,693		156
Asset dispositions		(1)	(48)	(278)
General and administrative expenses		338	475	574
Financing costs, net		270	250	580
Restructuring and transaction costs		49	84	97
Other, net		(34)	4	(7)
Total expenses		7,918	6,329	7,952
Earnings (loss) from continuing operations before income taxes		(3,090)	(109)	944
Income tax expense (benefit)		(547)	(30)	230
Net earnings (loss) from continuing operations		(2,543)	(79)	714
Net earnings (loss) from discontinued operations, net of income taxes		(128)	(274)	2,510
Net earnings (loss)		(2,671)	(353)	3,224
Net earnings attributable to noncontrolling interests		9	2	160
Net earnings (loss) attributable to Devon		$ (2,680)	$ (355)	$ 3,064
Basic net earnings (loss) per share:
Basic earnings (loss) from continuing operations per share		$ (6.78)	$ (0.21)	$ 1.43
Basic earnings (loss) from discontinued operations per share		(0.34)	(0.68)	4.71
Basic net earnings (loss) per share		(7.12)	(0.89)	6.14
Diluted net earnings (loss) per share:
Diluted earnings (loss) from continuing operations per share		(6.78)	(0.21)	1.42
Diluted earnings (loss) from discontinued operations per share		(0.34)	(0.68)	4.68
Diluted net earnings (loss) per share		$ (7.12)	$ (0.89)	$ 6.10
Comprehensive earnings (loss):
Net earnings (loss)		$ (2,671)	$ (353)	$ 3,224
Other comprehensive earnings (loss), net of tax:
Foreign currency translation, discontinued operations			78	(152)
Release of Canadian cumulative translation adjustment, discontinued operations	[1]		(1,237)
Pension and postretirement plans		(8)	13	44
Other comprehensive loss, net of tax		(8)	(1,146)	(108)
Comprehensive earnings (loss):		(2,679)	(1,499)	3,116
Comprehensive earnings attributable to noncontrolling interests		9	2	160
Comprehensive earnings (loss) attributable to Devon		(2,688)	(1,501)	2,956
Oil, Gas and NGL Sales [Member]
Revenues		2,695	3,809	4,085
Marketing and Midstream Revenues [Member]
Revenues		1,978	2,865	4,354
Marketing and Midstream Expenses [Member]
Expenses		$ 2,013	$ 2,812	$ 4,321

[1] In conjunction with the sale of substantially all of its oil and gas assets and operations in Canada, Devon released the cumulative translation adjustment as part of its gain on the disposition of its Canadian business. See Note 19 for additional details.