LOANS AND LEASES - Loans Held For Sale (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for sale, at fair value	$ 1,717	$ 2,733
Other loans held for sale	99	735
Residential loans held for sale
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for sale, at fair value	1,595	2,657
Other loans held for sale	0	0
Commercial loans held for sale
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for sale, at fair value	122	76
Other loans held for sale	$ 99	$ 735