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Stock Based Compensation Plans (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2002
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Weighted-average grant date fair value of incentive/performance unit awards and restricted share/restricted share unit awards granted $ 149.38 $ 122.10 $ 78.37  
Total intrinsic value of incentive/performance unit and restricted share/restricted share unit awards vested during the year. $ 254 $ 235 $ 147  
BlackRock Series C Preferred Stock        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
LTIP - Number of preferred stock shares transferred (shares) 103,064      
LTIP - Total preferred shares held at end of period (shares) 143,458      
BlackRock LTIP        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
BlackRock share transfer agreement (shares)       4,000,000