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Other Short-Term Borrowings (Components of Other Short-Term Borrowings) (Detail) - USD ($)
$ in Millions
Mar. 31, 2017
Dec. 31, 2016
Short Term Debt    
FHLB advances $ 950 $ 2,500
Securities sold under repurchase agreements 684 661
Derivative collateral 381 374
Total other short-term borrowings $ 2,015 $ 3,535