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LOANS AND LEASES - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Accrued interest receivable on loans and leases held for investment $ 530   $ 530   $ 495
Interest income on direct financing lease 19 $ 20 37 $ 40  
Retail | Residential mortgages          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Proceeds from sale of loans   492      
Retail | Education          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Payments for purchase of loans 691 $ 99 909 300  
Retail | Other retail          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Payments for purchase of loans 255   527    
Retail | Retail loans          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Proceeds from sale of loans     1,500 628  
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 25,500   25,500   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 40,900   40,900   $ 17,400
Commercial | Commercial          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Proceeds from sale of loans $ 71   $ 262 $ 182