VARIABLE INTEREST ENTITIES - Schedule of Consolidated Variable Interest Entities (Details) - USD ($) $ in Millions		Sep. 30, 2024	Dec. 31, 2023
ASSETS:
Cash and due from banks	[1]	$ 979	$ 1,794
Interest-bearing deposits in banks	[1]	648	405
Net loans and leases	[1]	139,553	143,861
Other assets	[1]	13,236	13,359
TOTAL ASSETS		219,706	221,964
LIABILITIES:
Long-term borrowed funds	[1]	13,944	13,467
Other liabilities	[1]	4,615	4,746
TOTAL LIABILITIES		194,774	197,622
Variable Interest Entity, Primary Beneficiary
ASSETS:
Cash and due from banks		0	13
Interest-bearing deposits in banks		209	106
Net loans and leases		4,432	3,194
Other assets		26	14
TOTAL ASSETS		4,667	3,327
LIABILITIES:
Long-term borrowed funds		3,801	2,692
Other liabilities		10	8
TOTAL LIABILITIES		$ 3,811	$ 2,700

[1] Includes amounts in consolidated VIEs. See Note 6 for additional information.