v3.10.0.1
Segment, Geographic and Revenue Information (Assets by Business Segment) (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Segment Reporting Information    
Assets $ 853,531 $ 851,733
Institutional Securities    
Segment Reporting Information    
Assets 646,427 664,974
Wealth Management    
Segment Reporting Information    
Assets 202,392 182,009
Investment Management    
Segment Reporting Information    
Assets $ 4,712 $ 4,750