Annual report pursuant to Section 13 and 15(d)

Benefit Plans (Details 2)

v2.4.1.9
Benefit Plans (Details 2) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Amounts Recognized in Balance Sheet [Abstract]        
Amounts Recognized in Balance Sheet $ 198,947us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheet $ 90,842us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheet    
Amounts Recognized in Other Comprehensive Income (Loss) [Abstract]        
Net acturial loss 240,197hban_OtherComprehensiveIncomeLossReclassificationPensionAndOtherPostretirementBenefitPlansNetGainLossRecognizedInNetPeriodicBenefitCostNetOfTax 166,078hban_OtherComprehensiveIncomeLossReclassificationPensionAndOtherPostretirementBenefitPlansNetGainLossRecognizedInNetPeriodicBenefitCostNetOfTax 262,187hban_OtherComprehensiveIncomeLossReclassificationPensionAndOtherPostretirementBenefitPlansNetGainLossRecognizedInNetPeriodicBenefitCostNetOfTax  
Prior service cost 14,517us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax 9,855us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax 25,788us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax  
DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeLossAfterTax $ 225,680us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax $ 156,223us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax $ 236,399us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax $ 185,364us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax