VARIABLE INTEREST ENTITIES - Schedule of Consolidated Variable Interest Entities (Details) - USD ($) $ in Millions		Mar. 31, 2026	Dec. 31, 2025
ASSETS:
Interest-bearing deposits in banks	[1]	$ 830	$ 961
Net loans and leases	[1]	141,709	140,749
Other assets	[1]	14,680	14,428
TOTAL ASSETS		227,918	226,351
LIABILITIES:
Long-term borrowed funds	[1]	12,260	11,224
Other liabilities	[1]	5,397	5,439
TOTAL LIABILITIES		201,746	200,034
Variable Interest Entity, Primary Beneficiary
ASSETS:
Interest-bearing deposits in banks		148	157
Net loans and leases		1,556	1,929
Other assets		11	11
TOTAL ASSETS		1,715	2,097
LIABILITIES:
Long-term borrowed funds		1,252	1,598
Other liabilities		3	4
TOTAL LIABILITIES		$ 1,255	$ 1,602

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