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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 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Net earnings (loss) from continuing operations:        
Net earnings (loss) from continuing operations $ (679) $ 151 $ (2,370) $ (227)
Attributable to participating securities   (2) (1) (1)
Basic and diluted earnings (loss) from continuing operations $ (679) $ 149 $ (2,371) $ (228)
Common shares:        
Common shares outstanding - total 383 415 383 425
Attributable to participating securities (6) (6) (6) (6)
Common shares outstanding - basic 377 409 377 419
Dilutive effect of potential common shares issuable   2    
Common shares outstanding - diluted 377 411 377 419
Net earnings (loss) per share from continuing operations:        
Basic $ (1.80) $ 0.37 $ (6.29) $ (0.54)
Diluted $ (1.80) $ 0.37 $ (6.29) $ (0.54)
Antidilutive options [1]   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.