Acquisition and Divestitures (Schedule of WPX Revenue and Earnings Included In Devons Consolidated Comprehensive Statements Of Earnings) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Business Acquisition [Line Items]
Total revenues	$ 1,762	$ 2,087
Net earnings (loss)	216	$ (1,815)
WPX
Business Acquisition [Line Items]
Total revenues	772
Net earnings (loss)	$ 166