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CASH FLOW INFORMATION - Summary of Supplemental Cash Flow Information (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024
Supplemental Cash Flow Elements [Abstract]
Interest paid on deposits and other borrowings	$ 708	$ 720
Income taxes paid	32	42
Transfers of loans to other real estate owned	2	1
Loans transferred to held for sale from portfolio	32	431
Loans transferred to portfolio from held for sale	$ 27	$ 14

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Transfer Of Loans To Portfolio Loans From Held-For-Sale

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Amount, before refund, of cash paid to foreign, federal, state, and local jurisdictions as income tax.

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Amount of cash paid for interest, excluding capitalized interest, classified as operating activity. Includes, but is not limited to, payment to settle zero-coupon bond for accreted interest of debt discount and debt instrument with insignificant coupon interest rate in relation to effective interest rate of borrowing attributable to accreted interest of debt discount.

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Value transferred out of real estate owned (REO) in noncash transactions.

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Value of loans and leases held in the entity's portfolio transferred to loans and leases held-for-sale in noncash transactions.

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