v3.10.0.1
Loans, Lending Commitments and Allowance for Credit Losses (Loans by Type) (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Loans Held for Investment        
Loans held for investment, gross $ 100,053 $ 93,177    
Allowance for loan losses (238) (224) $ (274) $ (225)
Loans held for investment, net 99,815 92,953    
Loans Held for Sale        
Loans held for sale, gross 15,764 11,173    
Allowance for loan losses 0 0    
Loans held for sale, net 15,764 11,173    
Total Loans        
Total loans, gross 115,817 104,350    
Allowance for loan losses (238) (224)    
Total loans, net 115,579 104,126    
Fixed rate loans, net 15,632 13,339    
Floating or adjustable rate loans, net 99,947 90,787    
Loans to non-U.S. borrowers, net 17,568 9,977    
Pass        
Loans Held for Investment        
Loans held for investment, gross 98,845 92,010    
Special Mention        
Loans Held for Investment        
Loans held for investment, gross 809 394    
Substandard        
Loans Held for Investment        
Loans held for investment, gross 399 766    
Doubtful        
Loans Held for Investment        
Loans held for investment, gross 0 7    
Loss        
Loans Held for Investment        
Loans held for investment, gross 0 0    
Corporate        
Loans Held for Investment        
Loans held for investment, gross 36,909 29,754    
Allowance for loan losses (144) (126) (195) (166)
Loans Held for Sale        
Loans held for sale, gross 13,886 9,456    
Total Loans        
Total loans, gross 50,795 39,210    
Corporate | Pass        
Loans Held for Investment        
Loans held for investment, gross 36,217 29,166    
Corporate | Special Mention        
Loans Held for Investment        
Loans held for investment, gross 492 188    
Corporate | Substandard        
Loans Held for Investment        
Loans held for investment, gross 200 393    
Corporate | Doubtful        
Loans Held for Investment        
Loans held for investment, gross 0 7    
Corporate | Loss        
Loans Held for Investment        
Loans held for investment, gross 0 0    
Consumer        
Loans Held for Investment        
Loans held for investment, gross 27,868 26,808    
Allowance for loan losses (7) (4) (4) (5)
Loans Held for Sale        
Loans held for sale, gross 0 0    
Total Loans        
Total loans, gross 27,868 26,808    
Consumer | Pass        
Loans Held for Investment        
Loans held for investment, gross 27,863 26,802    
Consumer | Special Mention        
Loans Held for Investment        
Loans held for investment, gross 5 6    
Consumer | Substandard        
Loans Held for Investment        
Loans held for investment, gross 0 0    
Consumer | Doubtful        
Loans Held for Investment        
Loans held for investment, gross 0 0    
Consumer | Loss        
Loans Held for Investment        
Loans held for investment, gross 0 0    
Residential Real Estate        
Loans Held for Investment        
Loans held for investment, gross 27,466 26,635    
Allowance for loan losses (20) (24) (20) (17)
Loans Held for Sale        
Loans held for sale, gross 22 35    
Total Loans        
Total loans, gross 27,488 26,670    
Residential Real Estate | Pass        
Loans Held for Investment        
Loans held for investment, gross 27,387 26,562    
Residential Real Estate | Special Mention        
Loans Held for Investment        
Loans held for investment, gross 0 0    
Residential Real Estate | Substandard        
Loans Held for Investment        
Loans held for investment, gross 79 73    
Residential Real Estate | Doubtful        
Loans Held for Investment        
Loans held for investment, gross 0 0    
Residential Real Estate | Loss        
Loans Held for Investment        
Loans held for investment, gross 0 0    
Wholesale Real Estate        
Loans Held for Investment        
Loans held for investment, gross 7,810 9,980    
Allowance for loan losses (67) (70) $ (55) $ (37)
Loans Held for Sale        
Loans held for sale, gross 1,856 1,682    
Total Loans        
Total loans, gross 9,666 11,662    
Wholesale Real Estate | Pass        
Loans Held for Investment        
Loans held for investment, gross 7,378 9,480    
Wholesale Real Estate | Special Mention        
Loans Held for Investment        
Loans held for investment, gross 312 200    
Wholesale Real Estate | Substandard        
Loans Held for Investment        
Loans held for investment, gross 120 300    
Wholesale Real Estate | Doubtful        
Loans Held for Investment        
Loans held for investment, gross 0 0    
Wholesale Real Estate | Loss        
Loans Held for Investment        
Loans held for investment, gross $ 0 $ 0