Annual report pursuant to Section 13 and 15(d)

LOANS AND LEASES AND ALLOWANCE FOR CREDIT LOSSES - Nonaccrual Loans by Loan Class (Details)

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LOANS AND LEASES AND ALLOWANCE FOR CREDIT LOSSES - Nonaccrual Loans by Loan Class (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total nonaccrual loans $ 349 $ 423
Commercial Portfolio Segment [Member] | Commercial and Industrial    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total nonaccrual loans 161 234
Commercial Portfolio Segment [Member] | Commercial Real Estate Loan [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total nonaccrual loans 29  
Commercial Portfolio Segment [Member] | Commercial Real Estate    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total nonaccrual loans   20
Consumer | Automobile    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total nonaccrual loans 6 6
Consumer | Home Equity    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total nonaccrual loans 68 72
Consumer | Residential Mortgage    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total nonaccrual loans 84 91
Consumer | RV and marine finance    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total nonaccrual loans 1 0
Consumer | Consumer    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total nonaccrual loans $ 0 $ 0