Quarterly report pursuant to Section 13 or 15(d)

LONG-TERM DEBT (Details)

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LONG-TERM DEBT (Details) - Senior Notes - USD ($)
6 Months Ended
Jun. 30, 2018
May 08, 2018
Huntington National Bank Senior Note Due May 2025, 4.00 Percent    
Debt Instrument [Line Items]    
Debt face amount   $ 500,000,000.0
Debt percent of value   99.686%
Debt stated interest rate   4.00%
Debt Instrument, Redemption Price, Percentage 100.00%  
Debt Issuance Costs, Gross $ 1,000,000  
Huntington National Bank Senior Note Due May 2021, 3.25 Percent    
Debt Instrument [Line Items]    
Debt face amount   $ 750,000,000
Debt percent of value   99.774%
Debt stated interest rate   3.25%
Debt Instrument, Redemption Price, Percentage 100.00%  
Debt Issuance Costs, Gross $ 2,000,000