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, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Financial effects of modification $ (2,000,000) $ (15,000,000)    
Transfer of Portfolio Loans and Leases to Held-for-sale 214,000,000 301,000,000 $ (12,000,000)  
Loans net premium 525,000,000 428,000,000    
Capital Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]        
Future lease rental payments due 1,800,000,000      
Future lease rental payments due, in 2016 700,000,000      
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 200,000,000      
Future lease rental payments due, in 2020 100,000,000      
Future lease rental payments due, after 2020 100,000,000      
Allowance for loan and lease losses 783,000,000 772,000,000 691,000,000 $ 638,000,000
Interest income under original terms for NAL loans 26,000,000 22,000,000 21,000,000  
Interest income recorded for NAL loans 9,000,000 12,000,000 18,000,000  
Interest income under original terms for TDR loans 52,000,000 51,000,000 49,000,000  
Interest income recorded for TDR loans 49,000,000 48,000,000 45,000,000  
Amount of security for borrowing and advances 39,600,000,000 46,500,000,000    
Consumer loans 81,000,000 79,000,000    
Loans and Leases Receivable, Gross 75,404,000,000 74,900,000,000    
Loans Receivable, Amortized Cost Disclosure   74,900,000,000    
Loans and Leases Receivable, Net Amount 74,621,000,000 74,128,000,000    
Commercial Portfolio Segment [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Capital Leases, Net Investment in Direct Financing Leases, Minimum Payments to be Received 1,841,000,000 1,747,000,000    
Capital Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]        
Allowance for loan and lease losses 552,000,000 542,000,000 482,000,000 451,000,000
Threshold outstanding balance for quarterly impairment evaluation $ 1,000,000      
Threshold period past due for nonperforming status 90 days      
Loans and Leases Receivable, Gross $ 30,664,000,000 30,605,000,000    
Capital Leases, Net Investment in Direct Financing Leases, Unguaranteed Residual Values of Leased Property 728,000,000 726,000,000    
Capital Leases Gross Investment In Direct Financing Leases 2,569,000,000 2,473,000,000    
Capital Leases, Net Investment in Direct Financing Leases, Initial Direct Costs 19,000,000 20,000,000    
Capital Leases, Net Investment in Direct Financing Leases, Deferred Income 249,000,000 250,000,000    
Capital Leases, Net Investment in Direct Financing Leases 2,339,000,000 2,243,000,000    
Consumer        
Capital Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]        
Allowance for loan and lease losses 231,000,000 230,000,000 $ 209,000,000 $ 187,000,000
Commercial and Industrial Loan [Member]        
Capital Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]        
Consumer loans 0 0    
Loans and Leases Receivable, Gross 30,664,000,000 30,605,000,000    
Loans Receivable, Amortized Cost Disclosure   30,605,000,000    
Real Estate Loan [Member]        
Capital Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]        
Consumer loans 0 0    
Loans and Leases Receivable, Gross 6,674,000,000 6,842,000,000    
Consumer        
Capital Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]        
Consumer loans 0 0    
Loans and Leases Receivable, Gross 1,237,000,000 1,320,000,000    
Consumer | Consumer        
Capital Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]        
Loans and Leases Receivable, Gross 1,237,000,000      
Loans Receivable, Amortized Cost Disclosure   1,320,000,000    
Commercial real estate        
Capital Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]        
Loans Receivable, Amortized Cost Disclosure   6,842,000,000    
Automobile Loan [Member]        
Capital Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]        
Consumer loans 0 0    
Loans and Leases Receivable, Gross 12,797,000,000 12,429,000,000    
Loans Receivable, Amortized Cost Disclosure   12,429,000,000    
Automobile Loan [Member] | Consumer        
Capital Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]        
Loans and Leases Receivable, Gross 12,797,000,000 12,429,000,000    
Home Equity        
Capital Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]        
Consumer loans 1,000,000 1,000,000    
Loans and Leases Receivable, Gross 9,093,000,000 9,722,000,000    
Loans Receivable, Amortized Cost Disclosure   9,722,000,000    
Home Equity | Consumer        
Capital Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]        
Loans and Leases Receivable, Gross 9,092,000,000 9,720,000,000    
Residential Mortgage        
Capital Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]        
Consumer loans 80,000,000 78,000,000    
Loans and Leases Receivable, Gross 11,376,000,000 10,728,000,000    
Loans Receivable, Amortized Cost Disclosure   10,728,000,000    
RV and marine finance        
Capital Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]        
Consumer loans 0 0    
Loans and Leases Receivable, Gross 3,563,000,000 3,254,000,000    
Loans Receivable, Amortized Cost Disclosure   3,254,000,000    
RV and marine finance | Consumer        
Capital Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]        
Loans and Leases Receivable, Gross $ 3,563,000,000 $ 3,254,000,000