VARIABLE INTEREST ENTITIES - Schedule of Consolidated Variable Interest Entities (Details) - USD ($) $ in Millions		Sep. 30, 2023	Dec. 31, 2022
ASSETS:
Cash and due from banks	[1]	$ 1,395	$ 1,489
Net loans and leases	[1]	147,666	154,679
Other assets	[1]	13,613	13,089
TOTAL ASSETS		225,270	226,733
LIABILITIES:
Long-term borrowed funds	[1]	17,354	15,887
Other liabilities	[1]	4,500	4,520
TOTAL LIABILITIES		202,392	$ 203,043
Variable Interest Entity, Primary Beneficiary
ASSETS:
Cash and due from banks		196
Net loans and leases		3,647
Other assets		15
TOTAL ASSETS		3,858
LIABILITIES:
Long-term borrowed funds		3,245
Other liabilities		10
TOTAL LIABILITIES		$ 3,255

[1] Includes amounts in consolidated VIEs. See Note 7 for additional information.