Quarterly report pursuant to Section 13 or 15(d)

Share Based Compensation (Details Textual)

v2.4.1.9
Share Based Compensation (Details Textual) (USD $)
In Millions, except Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Share Based Compensation (Textuals) [Abstract]    
Total fair value of awards vested $ 10.8us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue $ 9.6us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue
Share Based Compensation (Additional Textuals) [Abstract]    
Cash received for exercises of stock options 4.5us-gaap_EmployeeServiceShareBasedCompensationCashReceivedFromExerciseOfStockOptions  
Tax benefit realized from stock option exercises 0.7us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitRealizedFromExerciseOfStockOptions 0.3us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitRealizedFromExerciseOfStockOptions
Exercise of stock option   723,000us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
Award vested as of grant date 100.00%hban_AwardVestedAsOfGrantDate  
Granted, weighted average grant date fair value per share $ 10.69us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue $ 9.13us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
Total unrecognized compensation cost related to nonvested awards $ 65.4us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized  
Weighted-average expense recognition period 2 years 5 months  
Common stock available for future grants 13,700,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant  
After May 2004 [Member]    
Share Based Compensation (Textuals) [Abstract]    
Options granted, term P7Y  
Prior to May 2004 [Member]    
Share Based Compensation (Textuals) [Abstract]    
Options granted, term P10Y  
Restricted stock awards [Member]    
Share Based Compensation (Additional Textuals) [Abstract]    
Granted, weighted average grant date fair value per share $ 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_PlanNameAxis
= hban_RestrictedStockAwardsMember