Quarterly report pursuant to Section 13 or 15(d)

VIEs - Trust Preferred Securities (Details)

v3.21.2
VIEs - Trust Preferred Securities (Details)
$ in Millions
 6 Months Ended
Jun. 30, 2021
USD ($)
Variable Interest Entity, Not Primary Beneficiary  
Variable Interest Entity [Line Items]  
Long-term Debt, Gross $ 274
Investment in unconsolidated subsidiary $ 14
Huntington Capital I [Member] | London Interbank Offered Rate (LIBOR)  
Variable Interest Entity [Line Items]  
Basis spread on variable rate 0.70%
Huntington Capital I [Member] | Variable Interest Entity, Not Primary Beneficiary  
Variable Interest Entity [Line Items]  
Rate 0.85%
Long-term Debt, Gross $ 70
Investment in unconsolidated subsidiary $ 6
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, Not Primary Beneficiary  
Variable Interest Entity [Line Items]  
Rate 0.77%
Long-term Debt, Gross $ 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, Not Primary Beneficiary  
Variable Interest Entity [Line Items]  
Rate 1.55%
Long-term Debt, Gross $ 72
Investment in unconsolidated subsidiary $ 2
Sky Financial Capital Trust IV | London Interbank Offered Rate (LIBOR)  
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 1.55%
Long-term Debt, Gross $ 74
Investment in unconsolidated subsidiary $ 2
Camco Financial Trust [Member] | Variable Interest Entity, Not Primary Beneficiary  
Variable Interest Entity [Line Items]  
Rate 1.48%
Long-term Debt, Gross $ 5
Investment in unconsolidated subsidiary $ 1
First Huron Trust | Variable Interest Entity, Not Primary Beneficiary  
Variable Interest Entity [Line Items]  
Rate 5.07%
Long-term Debt, Gross $ 5
Investment in unconsolidated subsidiary $ 0
First Place Capital Trust I | London Interbank Offered Rate (LIBOR)  
Variable Interest Entity [Line Items]  
Basis spread on variable rate 2.85%
First Place Capital Trust I | Variable Interest Entity, Not Primary Beneficiary  
Variable Interest Entity [Line Items]  
Rate 3.00%
Long-term Debt, Gross $ 4
Investment in unconsolidated subsidiary $ 0
First Place Capital Trust II | Variable Interest Entity, Not Primary Beneficiary  
Variable Interest Entity [Line Items]  
Rate 6.45%
Long-term Debt, Gross $ 4
Investment in unconsolidated subsidiary $ 0
First Place Capital Trust III | Variable Interest Entity, Not Primary Beneficiary  
Variable Interest Entity [Line Items]  
Rate 5.69%
Long-term Debt, Gross $ 8
Investment in unconsolidated subsidiary $ 0