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VARIABLE INTEREST ENTITIES - Narrative (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Mar. 31, 2024
Variable Interest Entity [Line Items]
Loans retained by Huntington					$ 128,000,000
Affordable housing investments, impairment	$ 0	$ 0	$ 0	$ 0
Consolidated VIE \| Asset-backed securities
Variable Interest Entity [Line Items]
Aggregate loans					1,600,000,000
Consolidated VIE \| Consumer \| Automobile
Variable Interest Entity [Line Items]
Aggregate loans					$ 1,600,000,000