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Short-Term Borrowings (Components of Other Short-Term Borrowings) (Details) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Short Term Debt    
FHLB advances $ 2,500 $ 0
Securities sold under repurchase agreements 661 925
Derivative collateral 374 582
Total other short-term borrowings $ 3,535 $ 1,507