LOANS AND LEASES - Loans Held For Sale (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for sale, at fair value	$ 2,733	$ 3,564
Other loans held for sale	735	439
Residential loans held for sale
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for sale, at fair value	2,657	3,416
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	76	148
Other loans held for sale	$ 735	$ 439