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Share-Based Compensation (Summary Of Unvested Restricted Stock Awards and Units, Performance-Based Restricted Stock Awards And Performance Share Units) (Details)
shares in Thousands
6 Months Ended
Jun. 30, 2018
$ / shares
shares
Restricted Stock Awards And Units [Member]  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Unvested at December 31, 2017 | shares 6,328
Granted, awards and units | shares 3,501
Vested, awards and units | shares (2,843)
Forfeited, awards and units | shares (551)
Unvested at June 30, 2018 | shares 6,435
Unvested weighted average grant-date fair value at December 31, 2017 | $ / shares $ 36.81
Granted, weighted average grant-date fair value | $ / shares 35.89
Vested, weighted average grant-date fair value | $ / shares 38.83
Forfeited, weighted average grant-date fair value | $ / shares 35.54
Unvested weighted average grant-date fair value at June 30, 2018 | $ / shares $ 35.52
Performance-Based Restricted Stock Awards [Member]  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Unvested at December 31, 2017 | shares 575
Vested, awards and units | shares (231)
Unvested at June 30, 2018 | shares 344
Unvested weighted average grant-date fair value at December 31, 2017 | $ / shares $ 38.92
Vested, weighted average grant-date fair value | $ / shares 43.05
Unvested weighted average grant-date fair value at June 30, 2018 | $ / shares $ 36.14
Performance Share Units [Member]  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Unvested at December 31, 2017 | shares 2,758
Granted, awards and units | shares 845
Vested, awards and units | shares (571)
Forfeited, awards and units | shares (91)
Unvested at June 30, 2018 | shares 2,941 [1]
Unvested weighted average grant-date fair value at December 31, 2017 | $ / shares $ 41.21
Granted, weighted average grant-date fair value | $ / shares 37.40
Vested, weighted average grant-date fair value | $ / shares 84.22
Forfeited, weighted average grant-date fair value | $ / shares 33.37
Unvested weighted average grant-date fair value at June 30, 2018 | $ / shares $ 30.25
[1] A maximum of 5.9 million common shares could be awarded based upon Devon’s final TSR ranking relative to Devon’s peer group established under applicable award agreements.