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Discontinued Operations (Amounts Reported as Discontinued Operations in the Consolidated Statements of Comprehensive Earnings) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2020
Discontinued Operations And Disposal Groups [Abstract]    
Oil, gas and NGL sales $ 94 $ 263
Total revenues 94 263
Production expenses 66 214
Asset impairment charges [1] 3 182
Asset dispositions   (2)
General and administrative expenses 2 3
Financing costs, net (1) (3)
Other, net 26 19
Total expenses 96 413
Loss from discontinued operations before income taxes (2) (150)
Income tax expense (benefit) (15) (47)
Net earnings (loss) from discontinued operations, net of tax $ 13 $ (103)
[1] Devon recognized $182 million of asset impairments in the first nine months of 2020 related to the Barnett Shale assets primarily due to the difference between the net carrying value and the purchase price, net of estimated customary purchase price adjustments, which qualified as a level 2 fair value measurement.