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LOANS AND LEASES - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Accrued interest receivable on loans and leases held for investment $ 470   $ 470   $ 495
Interest income on direct financing lease 17 $ 18 54 $ 58  
Retail | Residential mortgages          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Proceeds from sale of loans     1,500    
Retail | Education          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Payments for purchase of loans 801 164 1,700 464  
Retail | Other retail          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Payments for purchase of loans 101 66 628 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 25,200   25,200   25,300
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 39,200   39,200   $ 17,400
Commercial | Education          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Proceeds from sale of loans 879   879    
Commercial | Commercial          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Proceeds from sale of loans $ 94 $ 109 $ 356 $ 291