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Components of Other Short-Term Borrowings (Details) - USD ($)
$ in Millions
Jun. 30, 2015
Dec. 31, 2014
Short Term Debt [Table]    
FHLB advances $ 2,850  
Securities sold under repurchase agreements 765 $ 995
Derivative collateral 521 561
Total other short-term borrowings $ 4,136 $ 1,556