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Short-Term Borrowings - Components of securities sold under repurchase agreements (Details) - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
Debt Disclosure [Abstract]    
Collateralized by securities purchased under resale agreements $ 202  
Collateralized by investment securities 4,195  
Collateralized by trading account assets 102  
Total $ 4,499 $ 8,925