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LOANS AND LEASES - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Accrued interest receivable on loans and leases held for investment $ 467   $ 467   $ 449
Interest income on direct financing lease 12 $ 19 25 $ 37  
Commercial | Commercial and industrial          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Proceeds from sale of loans 237 71 563 262  
Retail | Education          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Payments for purchase of loans 351 691 652 909  
Retail | Other retail          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Payments for purchase of loans 176 $ 255 353 527  
Retail | Consumer Loan          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Proceeds from sale of loans       $ 1,500  
Retail | Residential mortgages (2)          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Proceeds from sale of loans     0    
Retail | Residential mortgages (2)          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans pledged as collateral for FHLB borrowed funds 24,700   24,700   25,500
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 $ 39,700   $ 39,700   $ 40,000