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Interest and fee income generated by loans the Entity intends and has the ability to hold for the foreseeable future, or until maturity or payoff, including commercial and consumer loans, whether domestic or foreign, which may consist of: (1) industrial and agricultural; (2) real estate; and (3) real estate construction loans; (4) trade financing; (5) lease financing; (6) home equity lines-of-credit; (7) automobile and other vehicle loans; and (8) credit card and other revolving-type loans. Also includes interest income for leases held by the Entity.

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The aggregate interest expense incurred on short-term borrowings including commercial paper and Federal funds purchased and securities sold under agreements to repurchase.

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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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DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES - Schedule of Effect of Cash Flow Hedging on Income Statement (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025
Derivative [Line Items]
Interest Income - Loans and Leases	$ 509,000,000	$ 511,000,000	$ 1,488,000,000	$ 1,492,000,000
Interest Expense - Short-Term Borrowings	$ 25,000,000	$ 18,000,000	62,000,000	52,000,000
Interest rate contracts
Derivative [Line Items]
Amount of gain (loss) reclassified from AOCI into net income			0	0
Interest rate contracts \| Income Statement Location [Axis]: us-gaap:InterestAndDividendIncomeOperating
Derivative [Line Items]
Amount of gain (loss) reclassified from AOCI into net income			2,000,000	(19,000,000)
Interest rate contracts \| Income Statement Location [Axis]: us-gaap:InterestExpenseOperating
Derivative [Line Items]
Amount of gain (loss) reclassified from AOCI into net income			0	0
Interest rate contracts \| Income Statement Location [Axis]: us-gaap:InterestIncomeExpenseNet
Derivative [Line Items]
Amount of gain (loss) reclassified from AOCI into net income			$ 2,000,000	$ (19,000,000)