LOANS AND LEASES - Loans Held For Sale (Details) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for sale, at fair value	$ 1,048	$ 2,733
Other loans held for sale	914	735
Residential loans held for sale | Retail
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for sale, at fair value	954	2,657
Other loans held for sale	0	0
Other retail | Retail
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for sale, at fair value	0
Other loans held for sale	483
Commercial loans held for sale | Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for sale, at fair value	94	76
Other loans held for sale	$ 431	$ 735