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Acquisition and Divestitures (Schedule of WPX Revenue and Earnings Included In Devon's Consolidated Comprehensive Statements Of Earnings) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Business Acquisition [Line Items]
Total revenues	$ 3,466	$ 1,067	$ 7,933	$ 3,548
Net earnings (loss)	844	$ (90)	1,321	$ (2,573)
WPX
Business Acquisition [Line Items]
Total revenues	1,564		3,977
Net earnings (loss)	$ 414		$ 969

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