Huntington Bancshares Incorporated Annual report pursuant to Section 13 and 15(d)

Annual report pursuant to Section 13 and 15(d)

Benefit Plans (Details Textuals)

Benefit Plans (Details Textuals) (USD $)	12 Months Ended
Benefit Plans (Details Textuals) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Pension and Other Postretirement Benefit Plans, Amounts that Will be Amortized from Accumulated Other Comprehensive Income (Loss) in Next Fiscal Year [Abstract]
Defined Benefit Plan, Amortization of Net Transition Asset (Obligation)	$ 0
Defined Benefit Plan Future Amortization Of Prior Service Cost Credit	2,000,000
Defined Benefit Plan Future Amortization Of Gain Loss	8,400,000
Defined Benefit Plan, Information about Plan Assets [Abstract]
Fair value of plan assets, Percentage	100.00%hban_FairValueOfPlanAssetsPercentage	100.00%hban_FairValueOfPlanAssetsPercentage
Defined Contribution Pension and Other Postretirement Plans Disclosure [Abstract]
Match - Base pay contributed to the plan	Matched participant contributions up to first 4%
BasePayContributedToPlanProfitSharing	Profit-sharing contribution equal to first 1%
Pension Benefits [Member]
Benefit Plans (Textuals) [Abstract]
Contribution to plan	0
Defined Benefit Plan, Accumulated Benefit Obligation	799,600,000	685,000,000
Defined Benefit Plan Expenses	1,800,000	1,700,000	1,100,000
Estimated Net Periodic Pension Cost In Next Fiscal Year	2,500,000
Defined Benefit Plan, Pension Plans with Accumulated Benefit Obligations in Excess of Plan Asset
Defined Benefit Plan, Pension Plans with Accumulated Benefit Obligations in Excess of Plan Assets, Aggregate Projected Benefit Obligation	146,600,000
Defined Benefit Plan, Pension Plans with Accumulated Benefit Obligations in Excess of Plan Assets, Aggregate Accumulated Benefit Obligation	146,600,000
Defined Benefit Plan, Information about Plan Assets [Abstract]
Average duration of plan assets investment in bonds, years	12 years 5 months
Estimated Life Of Benefit Obligations	12 years 10 months
Post Retirement Benefits [Member]
Benefit Plans (Textuals) [Abstract]
Employees retirement age for health care and life insurance benefits under unfunded defined benefit post-retirement plan	55
DeferredCompensationArrangementWithIndividualRequisiteServicePeriod	10 years 0 months
Life insurance coverage, maximum	50,000
PlanAmendementMeasurementReductionInLiability	5,200,000
Contributions Received For Retiree Medical Program	2,600,000
Defined Benefit Plans Estimated Future Employer Contributions In Next Fiscal Year	1,400,000
Defined Benefit Plan, Assumed Health Care Cost Trend Rates [Abstract]
Defined Benefit Plan, Health Care Cost Trend Rate Assumed for Next Fiscal Year	7.30%
Defined Benefit Plan, Ultimate Health Care Cost Trend Rate	4.50%
Defined Benefit Plan, Year that Rate Reaches Ultimate Trend Rate	2028
Defined Benefit Plan, Description of Direction and Pattern of Change for Assumed Health Care Cost Trend Rate	These rates are assumed to decrease gradually
Effect of One-Percentage Point Change in Assumed Health Care Cost Trend Rates [Abstract]
Effect of One Percentage Point Increase on Service and Interest Cost Components	3,500
Effect of One Percentage Point Decrease on Service and Interest Cost Components	(2,900)
Effect of One Percentage Point Increase on Accumulated Postretirement Benefit Obligation	7,600
Effect of One Percentage Point Decrease on Accumulated Postretirement Benefit Obligation	(7,100)
Supplemental Executive Retirement Plan [Member]
Benefit Plans (Textuals) [Abstract]
Defined Benefit Plan Expenses	1,000,000	4,200,000	2,500,000
Pension and Other Postretirement Defined Benefit Plans, Liabilities	$ 35,000,000	$ 29,200,000
Equity Securities [Member] \| Pension Benefits [Member]
Defined Benefit Plan, Information about Plan Assets [Abstract]
Defined Benefit Plan, Actual Plan Asset Allocations	49.00%
Defined Benefit Plan, Target Plan Asset Allocations Range Minimum	20.00%
Defined Benefit Plan, Target Plan Assets Allocation Range Maximum	50.00%
Covered Bonds [Member] \| Pension Benefits [Member]
Defined Benefit Plan, Information about Plan Assets [Abstract]
Defined Benefit Plan, Actual Plan Asset Allocations	49.00%
Defined Benefit Plan, Target Plan Asset Allocations Range Minimum	50.00%
Defined Benefit Plan, Target Plan Assets Allocation Range Maximum	80.00%
Cash and Cash Equivalents [Member] \| Pension Benefits [Member]
Defined Benefit Plan, Information about Plan Assets [Abstract]
Defined Benefit Plan, Actual Plan Asset Allocations	2.00%