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Revenue Recognition (Disaggregated Revenue) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Disaggregation of Revenue [Line Items]        
Interest revenue $ 1,590 $ 1,127 $ 3,011 $ 2,182
Interest expense (183) (74) (341) (129)
Net interest revenue 1,407 1,053 2,670 2,053
Asset management and administration fees 814 845 1,665 1,668
Trading revenue 180 157 381 349
Other 85 75 168 141
Total net revenues 2,486 2,130 4,884 4,211
Mutual funds and ETF service fees [Member]        
Disaggregation of Revenue [Line Items]        
Asset management and administration fees 458 513 951 1,019
Advice solutions [Member]        
Disaggregation of Revenue [Line Items]        
Asset management and administration fees 283 256 565 500
Other [Member]        
Disaggregation of Revenue [Line Items]        
Asset management and administration fees 73 76 149 149
Commissions [Member]        
Disaggregation of Revenue [Line Items]        
Trading revenue 157 142 346 320
Principal Transactions [Member]        
Disaggregation of Revenue [Line Items]        
Trading revenue $ 23 $ 15 $ 35 $ 29