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Net Earnings (Loss) Per Share Attributable To Devon (Earnings Per Share Computations) (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Net earnings (loss):        
Net earnings (loss) attributable to Devon $ (3,507) $ 1,016 $ (9,922) $ 2,015
Attributable to participating securities (1) (11) (3) (20)
Basic and diluted earnings (loss) $ (3,508) $ 1,005 $ (9,925) $ 1,995
Common shares:        
Common shares outstanding - total 411 409 411 408
Attributable to participating securities (5) (4) (5) (4)
Common shares outstanding - basic 406 405 406 404
Dilutive effect of potential common shares issuable   2   2
Common shares outstanding - diluted 406 407 406 406
Net earnings (loss) per share attributable to Devon:        
Basic $ (8.64) $ 2.48 $ (24.45) $ 4.94
Diluted $ (8.64) $ 2.47 $ (24.45) $ 4.91
Antidilutive options [1] 4 1 4 3
[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.