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Revenue Recognition (Disaggregated Revenue) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Disaggregation of Revenue [Line Items]        
Interest revenue $ 1,755 $ 1,176 $ 4,766 $ 3,358
Interest expense (228) (94) (569) (223)
Net interest revenue 1,527 1,082 4,197 3,135
Asset management and administration fees 809 861 2,474 2,529
Trading revenue 176 151 557 500
Other 67 71 235 212
Total net revenues 2,579 2,165 7,463 6,376
Mutual funds and ETF service fees [Member]        
Disaggregation of Revenue [Line Items]        
Asset management and administration fees 435 519 1,386 1,538
Advice solutions [Member]        
Disaggregation of Revenue [Line Items]        
Asset management and administration fees 294 265 859 765
Other [Member]        
Disaggregation of Revenue [Line Items]        
Asset management and administration fees 80 77 229 226
Commissions [Member]        
Disaggregation of Revenue [Line Items]        
Trading revenue 155 136 501 456
Principal Transactions [Member]        
Disaggregation of Revenue [Line Items]        
Trading revenue $ 21 $ 15 $ 56 $ 44