DERIVATIVE FINANCIAL INSTRUMENTS - Schedule of Unrealized Gain on Cash Flow Hedges (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Other comprehensive income on cash flow hedge derivatives before reclassifications	$ 14	$ 0	$ 17	$ 0
Amounts reclassified from AOCI to earnings	2	0	2	0
Other comprehensive income on cash flow hedge derivatives	16	0	19	0
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Decrease in interest income on loans due to amounts reclassified from AOCI to earnings	(3,138)	(3,110)	(9,352)	(7,274)
Reclassification out of Accumulated Other Comprehensive Income \| Unrealized gain on cash flow hedge derivatives
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Decrease in interest income on loans due to amounts reclassified from AOCI to earnings	$ (2)	$ 0	$ (2)	$ 0

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Represents the total of interest and dividend income, including any amortization and accretion (as applicable) of discounts and premiums, earned from (1) loans and leases whether held-for-sale or held-in-portfolio; (2) investment securities; (3) federal funds sold; (4) securities purchased under agreements to resell; (5) investments in banker's acceptances, commercial paper, or certificates of deposit; (6) dividend income; or (7) other investments not otherwise specified herein.

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Amount, after reclassification, of tax expense (benefit) for gain (loss) from derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness.

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Amount, before tax and reclassification, of gain (loss) from derivative instrument designated and qualifying cash flow hedge included in assessment of hedge effectiveness.

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Amount, before tax, of reclassification of gain (loss) from accumulated other comprehensive income (AOCI) for derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness.

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