Huntington Bancshares Incorporated Quarterly report pursuant to Section 13 or 15(d)

VIEs - Trust Preferred Securities (Details) $ in Millions	3 Months Ended
VIEs - Trust Preferred Securities (Details) $ in Millions	Mar. 31, 2022 USD ($)
Variable Interest Entity
Variable Interest Entity [Line Items]
Principal amount of subordinated note/debenture issued to trust	$ 179
Investment in unconsolidated subsidiary	$ 8
Huntington Capital II \| London Interbank Offered Rate (LIBOR)
Variable Interest Entity [Line Items]
Basis spread on variable rate	0.625%
Huntington Capital II \| Variable Interest Entity
Variable Interest Entity [Line Items]
Rate	1.59%
Principal amount of subordinated note/debenture issued to trust	$ 32
Investment in unconsolidated subsidiary	$ 3
Sky Financial Capital Trust III \| London Interbank Offered Rate (LIBOR)
Variable Interest Entity [Line Items]
Basis spread on variable rate	1.40%
Sky Financial Capital Trust III \| Variable Interest Entity
Variable Interest Entity [Line Items]
Rate	2.37%
Principal amount of subordinated note/debenture issued to trust	$ 72
Investment in unconsolidated subsidiary	$ 2
Sky Financial Capital Trust IV \| Variable Interest Entity
Variable Interest Entity [Line Items]
Rate	2.37%
Principal amount of subordinated note/debenture issued to trust	$ 75
Investment in unconsolidated subsidiary	$ 3