Annual report pursuant to Section 13 and 15(d)

LOANS AND LEASES AND ALLOWANCE FOR CREDIT LOSSES - Narrative (Details)

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LOANS AND LEASES AND ALLOWANCE FOR CREDIT LOSSES - Narrative (Details) - USD ($)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans Receivable, Gross, Commercial and Industrial $ 28,107,000,000 $ 28,059,000,000    
Loans net premium 334,000,000 120,000,000    
Capital Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]        
Future lease rental payments due 1,700,000,000      
Future lease rental payments due, in 2016 600,000,000      
Future lease rental payments due, in 2017 400,000,000      
Future lease rental payments due, in 2018 300,000,000      
Future lease rental payments due, in 2019 100,000,000      
Future lease rental payments due, in 2020 100,000,000      
Future lease rental payments due, after 2020 200,000,000      
Allowance for loan and lease losses 691,000,000 638,000,000 $ 598,000,000 $ 605,000,000
Interest income under original terms for NAL loans 21,000,000 24,000,000 20,000,000  
Interest income recorded for NAL loans 18,000,000 17,000,000 10,000,000  
Interest income under original terms for TDR loans 49,000,000 49,000,000 46,000,000  
Interest income recorded for TDR loans $ 45,000,000 40,000,000 41,000,000  
Threshold period of consecutive payments to remove from nonaccrual status 6 months      
Amount of security for borrowing and advances $ 31,700,000,000 19,700,000,000    
Consumer loans 93,000,000 82,000,000    
Loans Receivable, Gross, Commercial, Real Estate 7,225,000,000 7,301,000,000    
Loans and Leases Receivable, Gross, Automobile 12,100,000,000 10,969,000,000    
Loans and Leases Receivable, Gross, Consumer, Home Equity 10,099,000,000 10,106,000,000    
Loans and Leases Receivable, Gross, Consumer, Mortgage 9,026,000,000 7,725,000,000    
Loans Receivable, Gross, Recreation Finance 2,438,000,000 1,846,000,000    
Loans and Leases Receivable, Gross, Consumer, Other 1,122,000,000 956,000,000    
Loans and Leases Receivable, Gross 70,117,000,000 66,962,000,000    
Loans and Leases Receivable, Net Amount 69,426,000,000 66,324,000,000    
Commercial Portfolio Segment [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans Receivable, Gross, Commercial and Industrial 28,107,000,000 28,059,000,000    
Capital Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]        
Allowance for loan and lease losses 482,000,000 451,000,000 399,000,000 390,000,000
Threshold outstanding balance for quarterly impairment evaluation $ 1,000,000      
Redefault status number of days 90 days      
Threshold period past due for nonperforming status 90 days      
Loans Receivable, Gross, Commercial, Real Estate $ 7,225,000,000 7,301,000,000    
Consumer        
Capital Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]        
Allowance for loan and lease losses 209,000,000 187,000,000 $ 199,000,000 $ 215,000,000
Loans and Leases Receivable, Gross, Automobile 12,099,000,000 10,967,000,000    
Loans and Leases Receivable, Gross, Consumer, Home Equity 10,097,000,000 10,103,000,000    
Loans and Leases Receivable, Gross, Consumer, Mortgage 8,937,000,000 7,650,000,000    
Loans and Leases Receivable, Gross, Consumer, Other 1,122,000,000 956,000,000    
Home Equity | Consumer        
Capital Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]        
Consumer loans 2,000,000 3,000,000    
Loans and Leases Receivable, Gross $ 10,099,000,000 10,106,000,000    
Residential Mortgage | Consumer        
Capital Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]        
Threshold period past due for nonperforming status 150 days      
Consumer loans $ 89,000,000 75,000,000    
Loans and Leases Receivable, Gross $ 9,026,000,000 $ 7,725,000,000