Annual report pursuant to Section 13 and 15(d)

VIEs - Trust Preferred Securities (Details)

v3.20.4
VIEs - Trust Preferred Securities (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2020
USD ($)
Variable Interest Entity [Line Items]  
Principal amount of subordinated note/ debenture issued to trust $ 8,191
Variable Interest Entity, Not Primary Beneficiary  
Variable Interest Entity [Line Items]  
Principal amount of subordinated note/ debenture issued to trust 252
Investment in unconsolidated subsidiary $ 14
Huntington Capital I | London Interbank Offered Rate (LIBOR) [Member]  
Variable Interest Entity [Line Items]  
Basis spread on variable rate 0.70%
Huntington Capital I | Variable Interest Entity, Not Primary Beneficiary  
Variable Interest Entity [Line Items]  
Rate 0.94%
Principal amount of subordinated note/ debenture issued to trust $ 70
Investment in unconsolidated subsidiary $ 6
Huntington Capital II | London Interbank Offered Rate (LIBOR) [Member]  
Variable Interest Entity [Line Items]  
Basis spread on variable rate 0.625%
Huntington Capital II | Variable Interest Entity, Not Primary Beneficiary  
Variable Interest Entity [Line Items]  
Rate 0.86%
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) [Member]  
Variable Interest Entity [Line Items]  
Basis spread on variable rate 1.40%
Sky Financial Capital Trust III | Variable Interest Entity, Not Primary Beneficiary  
Variable Interest Entity [Line Items]  
Rate 1.64%
Principal amount of subordinated note/ debenture issued to trust $ 72
Investment in unconsolidated subsidiary $ 2
Sky Financial Capital Trust IV | London Interbank Offered Rate (LIBOR) [Member]  
Variable Interest Entity [Line Items]  
Basis spread on variable rate 1.33%
Sky Financial Capital Trust IV | Variable Interest Entity, Not Primary Beneficiary  
Variable Interest Entity [Line Items]  
Rate 1.64%
Principal amount of subordinated note/ debenture issued to trust $ 74
Investment in unconsolidated subsidiary $ 2
Camco Financial Trust | Variable Interest Entity, Not Primary Beneficiary  
Variable Interest Entity [Line Items]  
Rate 1.57%
Principal amount of subordinated note/ debenture issued to trust $ 4
Investment in unconsolidated subsidiary $ 1