LOANS AND LEASES - Loans Held For Sale (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for sale, at fair value	$ 855	$ 774
Other loans held for sale	1,000	208
Residential loans held for sale | Retail
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for sale, at fair value	767	666
Other loans held for sale	0	0
Commercial loans held for sale | Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for sale, at fair value	88	108
Other loans held for sale	$ 1,000	$ 208