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Employee Incentive, Deferred Compensation, And Retirement Plans (Schedule Of Unvested Restricted Stock Award Roll Forward) (Details) - Restricted Stock Units and Restricted Stock Awards [Member]
shares in Thousands
12 Months Ended
Dec. 31, 2018
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Unvested, Beginning balance | shares 13,938
Granted | shares 2,496
Vested | shares (2,030)
Cancelled | shares (287)
Unvested, Ending balance | shares 14,117
Unvested, Weighted-average grant date fair value, Beginning balance | $ / shares $ 44.31
Granted, Weighted-average grant date fair value | $ / shares 55.94
Vested | $ / shares 41.18
Cancelled, Weighted-average grant date fair value | $ / shares 47.98
Unvested, Weighted-average grant date fair value, Ending balance | $ / shares $ 46.75