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Other Short-Term Borrowings (Components of Other Short-Term Borrowings) (Detail) - USD ($)
$ in Millions
Sep. 30, 2016
Dec. 31, 2015
Short Term Debt    
FHLB advances $ 1,950 $ 0
Securities sold under repurchase agreements 832 925
Derivative collateral 712 582
Total other short-term borrowings $ 3,494 $ 1,507