Huntington Bancshares Incorporated Quarterly report [Sections 13 or 15(d)]

DERIVATIVE FINANCIAL INSTRUMENTS - Fair Value Hedges (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024
Derivative Instruments, Gain (Loss) [Line Items]
Fair value hedging adjustments	$ (53)		$ (56)
Investment Securities
Derivative Instruments, Gain (Loss) [Line Items]
Amortized Cost	16,198		16,390
Cumulative Amount of Fair Value Hedging Adjustment To Hedged Items	(336)		(458)
Designated hedged items	11,000
Subordinated notes
Derivative Instruments, Gain (Loss) [Line Items]
Amortized Cost	11,606		11,589
Cumulative Amount of Fair Value Hedging Adjustment To Hedged Items	(80)		$ (223)
Interest income available for sale securities taxable \| Investment Securities
Derivative Instruments, Gain (Loss) [Line Items]
Change in fair value for derivatives designated as fair value hedges	(122)	$ 71
Interest income available for sale securities taxable \| Hedged investment securities
Derivative Instruments, Gain (Loss) [Line Items]
Change in fair value for derivatives designated as fair value hedges	123	(72)
Interest expense subordinated notes and other long term debt \| Subordinated notes
Derivative Instruments, Gain (Loss) [Line Items]
Change in fair value for derivatives designated as fair value hedges	143	(128)
Interest expense subordinated notes and other long term debt \| Hedged Subordinated notes
Derivative Instruments, Gain (Loss) [Line Items]
Change in fair value for derivatives designated as fair value hedges	$ (143)	$ 128