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LOANS AND LEASES - Narrative (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Interest income on direct financing lease $ 20,000,000   $ 40,000,000    
Retail | Residential mortgages          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Proceeds from sale of loans 492,000,000        
Retail | Education          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Payments for purchase of loans 99,000,000 $ 223,000,000 300,000,000 $ 223,000,000  
Retail | Retail loans          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Proceeds from sale of loans     628,000,000    
Retail | Retail TDRs          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Proceeds from sale of loans     22,000,000    
Retail | Residential mortgages          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans pledged as collateral for FHLB borrowed funds 24,400,000,000   24,400,000,000   $ 25,600,000,000
Consumer And Commercial Portfolio Segment | Auto, commercial and commercial real estate loans          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans pledged as collateral to support the contingent ability to borrow at the FRB discount window $ 18,600,000,000   18,600,000,000   $ 16,800,000,000
Commercial | Commercial          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Proceeds from sale of loans   $ 353,000,000 $ 182,000,000 $ 553,000,000  
Minimum          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Lessee, term of contract     3 years    
Maximum          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Lessee, term of contract     7 years