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 ($)
3 Months Ended 12 Months Ended
Dec. 31, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Financing Receivable, Modifications, Effect of Modification   $ (15,000,000) $ (13,000,000)    
Transfer of Portfolio Loans and Leases to Held-for-sale $ 121,000,000 301,000,000 (12,000,000) $ 123,000,000  
Loans Receivable, Gross, Commercial and Industrial 30,605,000,000 30,605,000,000 28,107,000,000    
Loans net premium 428,000,000 428,000,000 334,000,000    
Capital Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]          
Future lease rental payments due 1,700,000,000 1,700,000,000      
Future lease rental payments due, in 2016 600,000,000 600,000,000      
Future lease rental payments due, in 2017 400,000,000 400,000,000      
Future lease rental payments due, in 2018 300,000,000 300,000,000      
Future lease rental payments due, in 2019 200,000,000 200,000,000      
Future lease rental payments due, in 2020 100,000,000 100,000,000      
Future lease rental payments due, after 2020 100,000,000 100,000,000      
Allowance for loan and lease losses 772,000,000 772,000,000 691,000,000 638,000,000 $ 598,000,000
Interest income under original terms for NAL loans   22,000,000 21,000,000 24,000,000  
Interest income recorded for NAL loans   12,000,000 18,000,000 17,000,000  
Interest income under original terms for TDR loans   51,000,000 49,000,000 49,000,000  
Interest income recorded for TDR loans   48,000,000 45,000,000 40,000,000  
Amount of security for borrowing and advances 46,500,000,000 46,500,000,000 31,700,000,000    
Consumer loans 79,000,000 79,000,000 93,000,000    
Loans Receivable, Gross, Commercial, Real Estate 6,842,000,000 6,842,000,000 7,225,000,000    
Loans and Leases Receivable, Gross, Automobile 12,429,000,000 12,429,000,000 12,100,000,000    
Loans and Leases Receivable, Gross, Consumer, Home Equity 9,722,000,000 9,722,000,000 10,099,000,000    
Loans and Leases Receivable, Gross, Consumer, Mortgage 10,728,000,000 10,728,000,000 9,026,000,000    
Loans Receivable, Gross, Recreation Finance 3,254,000,000 3,254,000,000 2,438,000,000    
Loans and Leases Receivable, Gross, Consumer, Other 1,320,000,000 1,320,000,000 1,122,000,000    
Loans and Leases Receivable, Gross 74,900,000,000 74,900,000,000 70,117,000,000    
Loans and Leases Receivable, Net Amount 74,128,000,000 74,128,000,000 69,426,000,000    
Commercial Portfolio Segment [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans Receivable, Gross, Commercial and Industrial 30,605,000,000 30,605,000,000 28,107,000,000    
Capital Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]          
Allowance for loan and lease losses 542,000,000 542,000,000 482,000,000 451,000,000 399,000,000
Threshold outstanding balance for quarterly impairment evaluation   $ 1,000,000      
Threshold period past due for nonperforming status   90 days      
Loans Receivable, Gross, Commercial, Real Estate 6,842,000,000 $ 6,842,000,000 7,225,000,000    
Consumer          
Capital Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]          
Allowance for loan and lease losses 230,000,000 230,000,000 209,000,000 $ 187,000,000 $ 199,000,000
Loans and Leases Receivable, Gross, Automobile 12,429,000,000 12,429,000,000 12,099,000,000    
Loans and Leases Receivable, Gross, Consumer, Home Equity 9,720,000,000 9,720,000,000 10,097,000,000    
Loans and Leases Receivable, Gross, Consumer, Mortgage 10,650,000,000 10,650,000,000 8,937,000,000    
Loans and Leases Receivable, Gross, Consumer, Other 1,320,000,000 1,320,000,000 1,122,000,000    
Home Equity | Consumer          
Capital Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]          
Consumer loans 1,000,000 1,000,000 2,000,000    
Loans and Leases Receivable, Gross 9,722,000,000 9,722,000,000 10,099,000,000    
Residential Mortgage | Consumer          
Capital Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]          
Consumer loans 78,000,000 78,000,000 89,000,000    
Loans and Leases Receivable, Gross $ 10,728,000,000 $ 10,728,000,000 $ 9,026,000,000