LOANS AND LEASES - Loans Held For Sale (Details) - USD ($) $ in Millions	Mar. 31, 2026	Dec. 31, 2025
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for sale at fair value	$ 917	$ 1,065
Other loans held for sale	620	133
Total loans held for sale	1,537	1,198
Residential Mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for sale at fair value	778	895
Other loans held for sale	0	0
Total loans held for sale	778	895
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for sale at fair value	139	170
Other loans held for sale	620	133
Total loans held for sale	$ 759	$ 303