Quarterly report pursuant to Section 13 or 15(d)


LONG-TERM DEBT (Details) - Senior Notes - USD ($)
3 Months Ended
Jun. 30, 2017
Mar. 07, 2017
Huntington National Bank Senior Note Due March 2020, 2.375 Percent [Member]    
Debt Instrument [Line Items]    
Debt face amount   $ 700,000,000.0
Debt percent of value   99.994%
Debt stated interest rate   2.375%
Debt Instrument, Redemption Price, Percentage 100.00%  
Huntington National Bank Senior Floating Rate Notes Due March 2020 [Member]    
Debt Instrument [Line Items]    
Debt face amount   $ 300,000,000.0
Debt percent of value   100.00%
Debt Instrument, Description of Variable Rate Basis three month LIBOR  
Debt Instrument, Basis Spread on Variable Rate 51.00%