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BORROWINGS - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
BORROWINGS - Narrative (Details) - USD ($) $ in Millions	Sep. 30, 2026	Mar. 31, 2026	Sep. 30, 2026	Dec. 31, 2025
Debt Instrument [Line Items]
Carrying value of assets pledged as collateral against repurchase agreements	$ 0		$ 0	$ 40
Maturity term			60 days
Fixed-to-Floating Senior Notes Due April 12, 2028 \| Senior Notes
Debt Instrument [Line Items]
Debt face amount		$ 1,000
Debt stated interest rate		4.623%
Basis spread on variable rate		0.99%
Fixed Rate Subordinated Note Due January, 28 2041 \| Subordinated Notes
Debt Instrument [Line Items]
Debt face amount		$ 750
Debt stated interest rate		5.605%
Huntington National Bank Unsecured Notes Maturing March 2033 \| Credit Linked Notes
Debt Instrument [Line Items]
Debt face amount	$ 483	$ 410	$ 483
Debt stated interest rate		4.55%
Basis spread on variable rate	1.35%
Huntington National Bank Unsecured Notes Maturing March 2033 \| Credit Linked Notes \| Minimum
Debt Instrument [Line Items]
Debt stated interest rate	5.612%		5.612%
Basis spread on variable rate		1.00%
Huntington National Bank Unsecured Notes Maturing March 2033 \| Credit Linked Notes \| Maximum
Debt Instrument [Line Items]
Debt stated interest rate	11.879%		11.879%
Basis spread on variable rate		8.65%
Huntington National Bank Unsecured Notes Maturing March 2033 \| Credit Linked Notes \| Weighted average
Debt Instrument [Line Items]
Debt stated interest rate	6.69%		6.69%
Basis spread on variable rate		4.15%
Huntington National Bank Unsecured Notes Maturing March 2033 \| Auto Loan Securitization Trust
Debt Instrument [Line Items]
Reference pool	$ 4,600	$ 3,500	$ 4,600