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LOANS AND LEASES - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Accrued interest receivable on loans and leases held for investment $ 452   $ 450
Interest income on direct financing lease 11 $ 13  
Retail | Residential mortgages      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans pledged as collateral for FHLB borrowed funds 27,500   26,100
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 $ 36,000   $ 35,800