LOANS AND LEASES - Narrative (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest receivable		$ 816	$ 875
Net loans and leases	[1]	137,142	143,861
Interest income on direct financing and sales-type leases		41	46	$ 46
Retail | Residential mortgages | Pledged as collateral for FHLB borrowing capacity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Net loans and leases		37,500	36,000
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		$ 22,900	$ 31,900
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

[1] Includes amounts in consolidated VIEs. See Note 11 for additional information.