Consolidated Statements of Changes in Shareholders' Equity - USD ($) $ in Millions	Total	Huntington Shareholders’ Equity	Preferred Stock	Common Stock	Capital Surplus	Treasury Stock	AOCI	Retained Earnings	Noncontrolling Interest
Balance, beginning of year at Dec. 31, 2022	$ 17,769	$ 17,731	$ 2,167	$ 14	$ 15,309	$ (80)	$ (3,098)	$ 3,419	$ 38
Balance, beginning of year, common stock (in shares) at Dec. 31, 2022				1,449,390,000
Balance, beginning of year, treasury stock (in shares) at Dec. 31, 2022						(6,322,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	1,971	1,951						1,951	20
Other comprehensive income (loss), net of tax	422	422					422
Net proceeds from issuance of Series K/Series J Preferred Stock	317	317	317
Redemption of preferred stock	(82)	(82)	(90)					8
Cash dividends declared:
Common	(911)	(911)						(911)
Preferred	(142)	(142)						(142)
Recognition of the fair value of share-based compensation	97	97			97
Other share-based compensation activity (in shares)				6,333,000
Other share-based compensation activity	(19)	(19)		$ 1	(17)			(3)
Other	(24)	(11)				$ (11)			(13)
Other (in shares)						(1,081,000)
Balance, end of year at Dec. 31, 2023	19,398	19,353	2,394	$ 15	15,389	$ (91)	(2,676)	4,322	45
Balance, end of year, common stock (in shares) at Dec. 31, 2023				1,455,723,000
Balance, end of year, treasury stock (in shares) at Dec. 31, 2023						(7,403,000)
Cash dividends declared:
Income attributable to non-controlling interest	20
Net income	1,960	1,940						1,940	20
Other comprehensive income (loss), net of tax	(190)	(190)					(190)
Redemption of preferred stock	(410)	(410)	(405)					(5)
Common	(916)	(916)						(916)
Preferred	(134)	(134)						(134)
Recognition of the fair value of share-based compensation	106	106			106
Other share-based compensation activity (in shares)				4,897,000
Other share-based compensation activity	(16)	(16)			(13)			(3)
Other	(16)	7			2	$ 5			(23)
Other (in shares)						419,000
Balance, end of year at Dec. 31, 2024	$ 19,782	19,740	1,989	$ 15	15,484	$ (86)	(2,866)	5,204	42
Balance, end of year, common stock (in shares) at Dec. 31, 2024	1,453,635,809			1,460,620,000
Balance, end of year, treasury stock (in shares) at Dec. 31, 2024	(6,984,102)					(6,984,000)
Cash dividends declared:
Income attributable to non-controlling interest	$ 20
Net income	2,229	2,211						2,211	18
Other comprehensive income (loss), net of tax	958	958					958
Veritex acquisition, issuance of common stock (in shares)				106,995,000
Veritex acquisition, issuance of common stock	1,659	1,659		$ 1	1,658
Veritex acquisition, conversion of equity awards (in shares)				1,043,000
Veritex acquisition, conversion of equity awards	16	16			16
Net proceeds from issuance of Series K/Series J Preferred Stock	741	741	741
Common	(938)	(938)						(938)
Preferred	(124)	(124)						(124)
Recognition of the fair value of share-based compensation	113	113			113
Other share-based compensation activity (in shares)				6,262,000
Other share-based compensation activity	(31)	(31)			(29)			(2)
Other	(26)	(3)	1		2	$ (6)			(23)
Other (in shares)						(204,000)
Balance, end of year at Dec. 31, 2025	$ 24,379	$ 24,342	$ 2,731	$ 16	$ 17,244	$ (92)	$ (1,908)	$ 6,351	$ 37
Balance, end of year, common stock (in shares) at Dec. 31, 2025	1,567,732,506			1,574,920,000
Balance, end of year, treasury stock (in shares) at Dec. 31, 2025	(7,187,541)					(7,188,000)
Cash dividends declared:
Income attributable to non-controlling interest	$ 18