v3.4.0.3
Loans and Allowance for Credit Losses (Outstanding Loans and Credit Quality) (Details) - USD ($)
$ in Millions
Mar. 31, 2016
Dec. 31, 2015
Mar. 31, 2015
Dec. 31, 2014
Loans Held for Investments        
Loans held for investments, gross $ 75,896 $ 72,784 $ 60,611  
Allowance for loan losses (330) (225) (165) $ (149)
Loans held for investment, net 75,566 72,559    
Loans Held for Sale        
Loans held for sale, gross 13,236 13,200    
Loans held for sale, net 13,236 13,200    
Total Loans        
Total loans, gross 89,132 85,984    
Allowance for loan losses (330) (225)    
Total loans, net 88,802 85,759    
Total loans, net of allowance, made to foreign borrowers 9,470 9,789    
Loans at fixed interest rate 9,384 8,471    
Loans at floating or adjustable interest rate 79,418 77,288    
Pass        
Loans Held for Investments        
Loans held for investments, gross 73,864 71,235    
Special Mention        
Loans Held for Investments        
Loans held for investments, gross 437 300    
Substandard        
Loans Held for Investments        
Loans held for investments, gross 1,489 1,237    
Doubtful        
Loans Held for Investments        
Loans held for investments, gross 106 12    
Loss        
Loans Held for Investments        
Loans held for investments, gross 0 0    
Corporate        
Loans Held for Investments        
Loans held for investments, gross 25,126 23,554 21,121  
Allowance for loan losses (268) (166) (133) (118)
Loans Held for Sale        
Loans held for sale, gross 12,000 11,924    
Total Loans        
Total loans, gross 37,126 35,478    
Corporate | Pass        
Loans Held for Investments        
Loans held for investments, gross 23,129 22,040    
Corporate | Special Mention        
Loans Held for Investments        
Loans held for investments, gross 437 300    
Corporate | Substandard        
Loans Held for Investments        
Loans held for investments, gross 1,454 1,202    
Corporate | Doubtful        
Loans Held for Investments        
Loans held for investments, gross 106 12    
Corporate | Loss        
Loans Held for Investments        
Loans held for investments, gross 0 0    
Consumer        
Loans Held for Investments        
Loans held for investments, gross 22,174 21,528 17,372  
Allowance for loan losses (4) (5) (2) (2)
Loans Held for Sale        
Loans held for sale, gross 0 0    
Total Loans        
Total loans, gross 22,174 21,528    
Consumer | Pass        
Loans Held for Investments        
Loans held for investments, gross 22,174 21,528    
Consumer | Special Mention        
Loans Held for Investments        
Loans held for investments, gross 0 0    
Consumer | Substandard        
Loans Held for Investments        
Loans held for investments, gross 0 0    
Consumer | Doubtful        
Loans Held for Investments        
Loans held for investments, gross 0 0    
Consumer | Loss        
Loans Held for Investments        
Loans held for investments, gross 0 0    
Residential Real Estate        
Loans Held for Investments        
Loans held for investments, gross 21,780 20,863 16,853  
Allowance for loan losses (19) (17) (8) (8)
Loans Held for Sale        
Loans held for sale, gross 99 104    
Total Loans        
Total loans, gross 21,879 20,967    
Residential Real Estate | Pass        
Loans Held for Investments        
Loans held for investments, gross 21,745 20,828    
Residential Real Estate | Special Mention        
Loans Held for Investments        
Loans held for investments, gross 0 0    
Residential Real Estate | Substandard        
Loans Held for Investments        
Loans held for investments, gross 35 35    
Residential Real Estate | Doubtful        
Loans Held for Investments        
Loans held for investments, gross 0 0    
Residential Real Estate | Loss        
Loans Held for Investments        
Loans held for investments, gross 0 0    
Wholesale Real Estate        
Loans Held for Investments        
Loans held for investments, gross 6,816 6,839 5,265  
Allowance for loan losses (39) (37) $ (22) $ (21)
Loans Held for Sale        
Loans held for sale, gross 1,137 1,172    
Total Loans        
Total loans, gross 7,953 8,011    
Wholesale Real Estate | Pass        
Loans Held for Investments        
Loans held for investments, gross 6,816 6,839    
Wholesale Real Estate | Special Mention        
Loans Held for Investments        
Loans held for investments, gross 0 0    
Wholesale Real Estate | Substandard        
Loans Held for Investments        
Loans held for investments, gross 0 0    
Wholesale Real Estate | Doubtful        
Loans Held for Investments        
Loans held for investments, gross 0 0    
Wholesale Real Estate | Loss        
Loans Held for Investments        
Loans held for investments, gross $ 0 $ 0