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Short-Term Borrowings (Components of Other Short-Term Borrowings) (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Short Term Debt    
FHLB advances $ 3,125 $ 2,500
Securities sold under repurchase agreements 546 661
Derivative collateral 341 374
Total other short-term borrowings $ 4,012 $ 3,535