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Loans - Net Loans (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans, gross $ 26,309 $ 25,789    
Allowance for loan losses (74) (67) $ (54) $ (53)
Loans, net of allowance 26,235 25,722    
Overdrafts 3,256 5,444    
Domestic        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans, gross 20,528 20,353    
Foreign        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans, gross 5,781 5,436    
Loans to investment funds | Domestic        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans, gross 14,546 15,050    
Loans to investment funds | Foreign        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans, gross 4,662 4,505    
Senior secured bank loans | Domestic        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans, gross 3,342 3,490    
Senior secured bank loans | Foreign        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans, gross 1,119 931    
Loans to municipalities | Domestic        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans, gross 848 902    
Other | Domestic        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans, gross 26 37    
Commercial real estate | Domestic        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans, gross $ 1,766 $ 874