LOANS AND LEASES - Narrative (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest receivable		$ 825	$ 816
Net loans and leases	[1]	140,749	137,142
Interest income on direct financing and sales-type leases		45	41	$ 46
Retail | Residential mortgages | Federal Home Loan Bank Advances
Accounts, Notes, Loans and Financing Receivable [Line Items]
Net loans and leases		40,800	37,500
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		$ 19,000	$ 22,900
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 9 for additional information.