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Loans - Repricing Characteristics (Details)
$ in Millions
Dec. 31, 2017
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]  
Loans Due Over 1 But Within 5 Years $ 25,876
Loans Due Over 5 Years 18,171
Receivables at predetermined interest rates [Member]  
Accounts, Notes, Loans and Financing Receivable [Line Items]  
Loans Due Over 1 But Within 5 Years 1,535
Loans Due Over 5 Years 4,496
Receivables at floating or adjustable rates [Member]  
Accounts, Notes, Loans and Financing Receivable [Line Items]  
Loans Due Over 1 But Within 5 Years 24,341
Loans Due Over 5 Years $ 13,675