INVESTMENT SECURITIES - Schedule of Securities Pledged as Collateral (Details) - USD ($) $ in Millions	Sep. 30, 2026	Dec. 31, 2025
Investments, Debt and Equity Securities [Abstract]
Securities pledged (carrying value), to secure public deposits, trust deposits and for other purposes as required by law	$ 6,472	$ 6,445
Securities pledged (carrying value), as collateral for short-term borrowings	$ 124	$ 140
Securities pledged as a percent of total securities	80.90%	84.00%

The carrying amount (fair value) as of the balance sheet date of securities held that had been pledged by counterparties under financing and lending arrangements, pursuant to which the entity has the right by agreement or custom to sell or re-pledge such securities.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 5
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481962/310-10-50-5

Name:	us-gaap_SecuritiesHeldAsCollateralAtFairValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant