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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, 2016
$ / shares
shares
Restricted Stock Awards And Units [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Unvested at December 31, 2015 | shares 4,738
Granted, awards and units | shares 4,390
Vested, awards and units | shares (2,473)
Forfeited, awards and units | shares (248)
Unvested at December 31, 2016 | shares 6,407
Unvested weighted average grant-date fair value at December 31, 2015 | $ / shares $ 62.49
Granted, weighted average grant-date fair value | $ / shares 19.91
Vested, weighted average grant-date fair value | $ / shares 61.44
Forfeited, weighted average grant-date fair value | $ / shares 44.38
Unvested weighted average grant-date fair value at December 31, 2016 | $ / shares $ 34.40
Performance-Based Restricted Stock Awards [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Unvested at December 31, 2015 | shares 434
Granted, awards and units | shares 330
Vested, awards and units | shares (179)
Unvested at December 31, 2016 | shares 585
Unvested weighted average grant-date fair value at December 31, 2015 | $ / shares $ 60.48
Granted, weighted average grant-date fair value | $ / shares 19.22
Vested, weighted average grant-date fair value | $ / shares 59.10
Unvested weighted average grant-date fair value at December 31, 2016 | $ / shares $ 37.60
Performance Share Units [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Unvested at December 31, 2015 | shares 1,859
Granted, awards and units | shares 1,388
Vested, awards and units | shares (602)
Forfeited, awards and units | shares (41)
Unvested at December 31, 2016 | shares 2,604 [1]
Unvested weighted average grant-date fair value at December 31, 2015 | $ / shares $ 76.17
Granted, weighted average grant-date fair value | $ / shares 10.41
Vested, weighted average grant-date fair value | $ / shares 63.37
Forfeited, weighted average grant-date fair value | $ / shares 43.88
Unvested weighted average grant-date fair value at December 31, 2016 | $ / shares $ 46.66
[1] A maximum of 5.2 million common shares could be awarded based upon Devon’s final TSR ranking.