VARIABLE INTEREST ENTITIES - Schedule of Consolidated Variable Interest Entities (Details) - USD ($) $ in Millions		Dec. 31, 2023	Dec. 31, 2022
ASSETS:
Cash and due from banks	[1]	$ 1,794	$ 1,489
Interest-bearing deposits in banks	[1]	405	303
Net loans and leases	[1]	143,861	154,679
Other assets	[1]	13,359	13,089
TOTAL ASSETS		221,964	226,733
LIABILITIES:
Long-term borrowed funds	[1]	13,467	15,887
Other liabilities	[1]	4,746	4,520
TOTAL LIABILITIES		197,622	$ 203,043
Variable Interest Entity, Primary Beneficiary
ASSETS:
Cash and due from banks		13
Interest-bearing deposits in banks		106
Net loans and leases		3,194
Other assets		14
TOTAL ASSETS		3,327
LIABILITIES:
Long-term borrowed funds		2,692
Other liabilities		8
TOTAL LIABILITIES		$ 2,700

[1] Includes amounts in consolidated VIEs. See Note 11 for additional information.