BORROWINGS - Schedule of Credit Linked Notes (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2025	Dec. 31, 2024
Debt Instrument [Line Items]
Long-term debt, aggregate unpaid principal		$ 17,292
Long-term debt	[1]	17,221	$ 16,374
Estimate of Fair Value Measurement
Debt Instrument [Line Items]
Long-term debt		17,479	16,573
Unsecured debt
Debt Instrument [Line Items]
Long-term debt		1,161	821
Huntington National Bank Unsecured Notes Maturing May 20, 2032 | Unsecured debt
Debt Instrument [Line Items]
Reference pool		9,531	6,754
Long-term debt		1,161	821
Huntington National Bank Unsecured Notes Maturing May 20, 2032 | Unsecured debt | Estimate of Fair Value Measurement
Debt Instrument [Line Items]
Long-term debt		10	4
Huntington National Bank Unsecured Notes Maturing May 20, 2032 | Unsecured debt | Bank
Debt Instrument [Line Items]
Long-term debt, aggregate unpaid principal		$ 1,151	$ 817
Huntington National Bank Unsecured Notes Maturing May 20, 2032 | Unsecured debt
Debt Instrument [Line Items]
Weighted average rate		6.45%	6.66%
Reference pool		$ 1,703	$ 3,014
Debt stated interest rate		6.15%
Huntington National Bank Unsecured Notes Maturing May 20, 2032 | Unsecured debt | Minimum
Debt Instrument [Line Items]
Basis spread on variable rate		1.40%
Huntington National Bank Unsecured Notes Maturing May 20, 2032 | Unsecured debt | Maximum
Debt Instrument [Line Items]
Basis spread on variable rate		8.25%
Huntington National Bank Unsecured Notes Maturing May 20, 2032 | Unsecured debt | Weighted Average
Debt Instrument [Line Items]
Basis spread on variable rate		3.04%
Huntington National Bank Unsecured Notes Maturing May 20, 2032 | Unsecured debt | Bank
Debt Instrument [Line Items]
Long-term debt, aggregate unpaid principal		$ 210	$ 366
Huntington National Bank Unsecured Notes Maturing May 20, 2032 | Unsecured debt
Debt Instrument [Line Items]
Weighted average rate		5.89%	6.03%
Reference pool		$ 2,213	$ 3,740
Debt stated interest rate		5.44%
Huntington National Bank Unsecured Notes Maturing May 20, 2032 | Unsecured debt | Minimum
Debt Instrument [Line Items]
Basis spread on variable rate		1.35%
Huntington National Bank Unsecured Notes Maturing May 20, 2032 | Unsecured debt | Maximum
Debt Instrument [Line Items]
Basis spread on variable rate		7.50%
Huntington National Bank Unsecured Notes Maturing May 20, 2032 | Unsecured debt | Weighted Average
Debt Instrument [Line Items]
Basis spread on variable rate		3.03%
Huntington National Bank Unsecured Notes Maturing May 20, 2032 | Unsecured debt | Bank
Debt Instrument [Line Items]
Long-term debt, aggregate unpaid principal		$ 272	$ 451
Huntington National Bank Unsecured Notes Maturing May 20, 2032 | Unsecured debt
Debt Instrument [Line Items]
Weighted average rate		5.48%
Reference pool		$ 2,522
Huntington National Bank Unsecured Notes Maturing May 20, 2032 | Unsecured debt | Bank
Debt Instrument [Line Items]
Long-term debt, aggregate unpaid principal		$ 302
Huntington National Bank Unsecured Notes Maturing May 20, 2032 | Unsecured debt
Debt Instrument [Line Items]
Weighted average rate		5.35%
Reference pool		$ 3,093
Huntington National Bank Unsecured Notes Maturing May 20, 2032 | Unsecured debt | Bank
Debt Instrument [Line Items]
Long-term debt, aggregate unpaid principal		$ 367
Huntington National Bank Unsecured Noted Maturing March 2033 | Unsecured debt
Debt Instrument [Line Items]
Debt stated interest rate		4.96%
Huntington National Bank Unsecured Noted Maturing March 2033 | Unsecured debt | Minimum
Debt Instrument [Line Items]
Basis spread on variable rate		2.25%
Huntington National Bank Unsecured Noted Maturing March 2033 | Unsecured debt | Maximum
Debt Instrument [Line Items]
Basis spread on variable rate		7.15%
Huntington National Bank Unsecured Noted Maturing March 2033 | Unsecured debt | Weighted Average
Debt Instrument [Line Items]
Basis spread on variable rate		4.34%
Huntington National Bank Unsecured Notes Maturing September 2033 | Unsecured debt
Debt Instrument [Line Items]
Debt stated interest rate		4.84%
Huntington National Bank Unsecured Notes Maturing September 2033 | Unsecured debt | Minimum
Debt Instrument [Line Items]
Basis spread on variable rate		1.20%
Huntington National Bank Unsecured Notes Maturing September 2033 | Unsecured debt | Maximum
Debt Instrument [Line Items]
Basis spread on variable rate		6.60%
Huntington National Bank Unsecured Notes Maturing September 2033 | Unsecured debt | Weighted Average
Debt Instrument [Line Items]
Basis spread on variable rate		3.05%

[1] Includes VIE balances in net loans and leases, other assets, long-term debt, and other liabilities of $669 million, $431 million, $600 million, and $152 million, respectively, at December 31, 2025, and $1.1 billion, $264 million, $1.0 billion, and $109 million, respectively, at December 31, 2024. See Note 21 - “Variable Interest Entities” for additional information.