VARIABLE INTEREST ENTITIES - Schedule of Consolidated Variable Interest Entities (Details) - USD ($) $ in Millions		Sep. 30, 2025	Dec. 31, 2024
ASSETS:
Interest-bearing deposits in banks	[1]	$ 694	$ 635
Net loans and leases	[1]	138,898	137,142
Other assets	[1]	13,318	13,941
TOTAL ASSETS		222,747	217,521
LIABILITIES:
Long-term borrowed funds	[1]	10,441	12,401
Other liabilities	[1]	5,514	4,870
TOTAL LIABILITIES		196,918	193,267
Variable Interest Entity, Primary Beneficiary
ASSETS:
Interest-bearing deposits in banks		169	209
Net loans and leases		2,353	3,843
Other assets		15	21
TOTAL ASSETS		2,537	4,073
LIABILITIES:
Long-term borrowed funds		1,982	3,375
Other liabilities		5	8
TOTAL LIABILITIES		$ 1,987	$ 3,383

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