DERIVATIVE FINANCIAL INSTRUMENTS - Schedule of Other Comprehensive (Loss) Gain on Cash Flow Hedges, Pretax (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Other comprehensive (loss) income on cash flow hedge derivatives before reclassifications	$ (64)	$ (2)	$ (111)	$ 10
Amounts reclassified from AOCI to earnings	(2)	0	(4)	(4)
Other comprehensive (loss) income on cash flow hedge derivatives	(66)	(2)	(115)	6
Interest income on cash flow hedges	(2,965)	(2,998)	(8,602)	(8,838)
Reclassification out of Accumulated Other Comprehensive Income \| Unrealized gain (loss) on cash flow hedge derivatives
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Interest income on cash flow hedges	$ 2	$ 0	$ 4	$ 4

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.

- Definition

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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