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LOANS AND LEASES - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Interest income on direct financing lease $ 18   $ 58    
Retail | Education          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Payments for purchase of loans 164 $ 98 464 $ 321  
Retail | Other retail          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Payments for purchase of loans 66   66    
Retail | Retail loans          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Proceeds from sale of loans     628    
Retail | Retail TDRs          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Proceeds from sale of loans     22    
Retail | Residential mortgages          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans pledged as collateral for FHLB borrowed funds 25,300   25,300   $ 25,600
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 18,000   18,000   $ 16,800
Commercial | Commercial          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Proceeds from sale of loans $ 109   $ 291 $ 553  
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