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Borrowings (Schedule of FHLB, Advances, Maturity Summary) (Details) - USD ($)
$ in Millions
Jun. 30, 2017
Dec. 31, 2016
Debt Disclosure [Abstract]    
2017 $ 3,720  
2018 125  
2019 0  
2020 0  
Thereafter 1,025  
Federal Home Loan Bank Advances $ 4,870 $ 2,980