DERIVATIVE FINANCIAL INSTRUMENTS - Schedule of Derivative Instruments Fair Value Hedges (Details) - Qualifying Hedges - Interest rate contracts - Fair Value Hedges - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2025	Mar. 31, 2024
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Net gain on fair value hedges	$ 1	$ 0
Deposits
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Recognized on derivatives	0	0
Recognized on hedged item	0	0
Borrowings
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Recognized on derivatives	0	(5)
Recognized on hedged item	$ 1	$ 5

Amount of gain (loss) from the increase (decrease) in fair value of derivative and nonderivative instruments designated as fair value hedging instruments recognized in the income statement.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 815
-SubTopic 25
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (a)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480238/815-25-50-1

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- Definition

Amount of the increase (decrease) in fair value of the hedged item in a fair value hedge recognized in the income statement.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Total amount of gain (loss) derived from fair value hedges recognized in earnings in the period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480434/815-10-50-4C

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