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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
3 Months Ended
Mar. 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 4,261
Vested, awards and units | shares (1,167)
Forfeited, awards and units | shares (74)
Unvested at March 31, 2016 | shares 7,758
Unvested weighted average grant-date fair value at December 31, 2015 | $ / shares $ 62.49
Granted, weighted average grant-date fair value | $ / shares 19.31
Vested, weighted average grant-date fair value | $ / shares 62.55
Forfeited, weighted average grant-date fair value | $ / shares 60.24
Unvested weighted average grant-date fair value at March 31, 2016 | $ / shares $ 38.79
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 (102)
Forfeited, awards and units | shares
Unvested at March 31, 2016 | shares 662
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 $ 62.55
Forfeited, weighted average grant-date fair value | $ / shares
Unvested weighted average grant-date fair value at March 31, 2016 | $ / shares $ 39.57
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 (7)
Unvested at March 31, 2016 | shares 2,638 [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 81.67
Unvested weighted average grant-date fair value at March 31, 2016 | $ / shares 46.52
Maximum [Member] | Performance Share Units [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Granted, weighted average grant-date fair value | $ / shares $ 10.61
Maximum common shares that could be awarded based upon total shareholder return | shares 5,300
[1] A maximum of 5.3 million common shares could be awarded based upon Devon's final TSR ranking relative to Devon's peer group established under applicable award agreements.