LOANS AND LEASES - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest receivable	$ 820	$ 450
Net loans and leases	154,679	126,405
Interest income on direct financing and sales-type leases	46	49	$ 64
Retail | Residential mortgages | Pledged as collateral for FHLB borrowing capacity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Net loans and leases	38,400	26,100
Retail and Commercial | Auto, commercial and commercial real estate loans | Notes Payable, Other Payables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Net loans and leases	$ 34,800	$ 35,800
Minimum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term of contract	3 years
Maximum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term of contract	10 years