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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
12 Months Ended
Dec. 31, 2017
$ / shares
shares
Restricted Stock Awards And Units [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Unvested at December 31, 2016 | shares 6,407
Granted, awards and units | shares 2,691
Vested, awards and units | shares (2,431)
Forfeited, awards and units | shares (339)
Unvested at December 31, 2017 | shares 6,328
Unvested weighted average grant-date fair value at December 31, 2016 | $ / shares $ 34.40
Granted, weighted average grant-date fair value | $ / shares 44.87
Vested, weighted average grant-date fair value | $ / shares 39.51
Forfeited, weighted average grant-date fair value | $ / shares 35.92
Unvested weighted average grant-date fair value at December 31, 2017 | $ / shares $ 36.81
Performance-Based Restricted Stock Awards [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Unvested at December 31, 2016 | shares 585
Granted, awards and units | shares 223
Vested, awards and units | shares (233)
Unvested at December 31, 2017 | shares 575
Unvested weighted average grant-date fair value at December 31, 2016 | $ / shares $ 37.60
Granted, weighted average grant-date fair value | $ / shares 44.85
Vested, weighted average grant-date fair value | $ / shares 41.27
Unvested weighted average grant-date fair value at December 31, 2017 | $ / shares $ 38.92
Performance Share Units [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Unvested at December 31, 2016 | shares 2,604
Granted, awards and units | shares 1,010
Vested, awards and units | shares (832)
Forfeited, awards and units | shares (24)
Unvested at December 31, 2017 | shares 2,758 [1]
Unvested weighted average grant-date fair value at December 31, 2016 | $ / shares $ 46.66
Granted, weighted average grant-date fair value | $ / shares 52.58
Vested, weighted average grant-date fair value | $ / shares 78.19
Forfeited, weighted average grant-date fair value | $ / shares 40.70
Unvested weighted average grant-date fair value at December 31, 2017 | $ / shares $ 41.21
[1] A maximum of 5.5 million common shares could be awarded based upon Devon’s final TSR ranking.