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

BENEFIT PLANS - Narrative (Details)

BENEFIT PLANS - Narrative (Details) $ in Millions	3 Months Ended
BENEFIT PLANS - Narrative (Details) $ in Millions	Mar. 31, 2016 USD ($) year	Dec. 31, 2015
Defined Benefit Plan, Information about Plan Assets [Abstract]
Fair value of plan assets, Percentage	100.00%	100.00%
Average duration of plan assets investment in bonds, years	12 years 6 months 11 days
Defined Contribution Pension and Other Postretirement Plans Disclosure [Abstract]
Match - Base pay contributed to the plan	matches participant contributions, up to the first 4%
Base Pay Contributed To Plan Profit Sharing	profit-sharing contribution equal to 1% of eligible participants’ 2015
Pension Benefits
Defined Benefit Plan, Information about Plan Assets [Abstract]
Estimated Life Of Benefit Obligations	11 years 10 months 25 days
Post Retirement Benefits
Benefit Plans (Textuals) [Abstract]
Employees retirement age for health care and life insurance benefits under unfunded defined benefit post-retirement plan \| year	55
Deferred Compensation Arrangement With Individual Requisite Service Period	10 years
Plan Amendment Measurement Reduction In Liability \| $	$ 5
Equity Securities
Defined Benefit Plan, Information about Plan Assets [Abstract]
Defined Benefit Plan, Actual Plan Asset Allocations	47.00%
Defined Benefit Plan, Target Plan Asset Allocations Range Minimum	20.00%
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum	50.00%
Covered Bonds
Defined Benefit Plan, Information about Plan Assets [Abstract]
Defined Benefit Plan, Actual Plan Asset Allocations	51.00%
Defined Benefit Plan, Target Plan Asset Allocations Range Minimum	50.00%
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum	80.00%
Cash and Cash Equivalents
Defined Benefit Plan, Information about Plan Assets [Abstract]
Defined Benefit Plan, Actual Plan Asset Allocations	2.00%