LOANS AND LEASES - Loans Held For Sale (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for sale at fair value	$ 768	$ 825
Other loans held for sale	566	33
Total loans held for sale	1,334	858
Residential Mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for sale at fair value	592	633
Other loans held for sale	0	0
Total loans held for sale	592	633
Other Retail
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for sale at fair value	0
Other loans held for sale	466
Total loans held for sale	466
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for sale at fair value	176	192
Other loans held for sale	100	33
Total loans held for sale	$ 276	$ 225