Quarterly report pursuant to Section 13 or 15(d)

Business Combinations (Detail Textuals)

v2.4.1.9
Business Combinations (Detail Textuals) (USD $)
 3 Months Ended 0 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2015
Dec. 31, 2014
Mar. 30, 2012
Mar. 02, 2014
Business Acquisition Line Items            
Goodwill $ 678,369,000us-gaap_Goodwill   $ 678,369,000us-gaap_Goodwill $ 522,541,000us-gaap_Goodwill    
Business Combination, Bargain Purchase, Gain Recognized, Amount 0us-gaap_BusinessCombinationBargainPurchaseGainRecognizedAmount 0us-gaap_BusinessCombinationBargainPurchaseGainRecognizedAmount        
Fidelity Bank [Member]            
Business Acquisition Line Items            
Business Combinatio nRecognized Identifiable Assets Acquired And Liabilities Assumed Financial Assets         523,900,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedFinancialAssets
/ us-gaap_BusinessAcquisitionAxis
= hban_FidelityBankMember 		 
Camco Financial [Member]            
Business Acquisition Line Items            
Business Combinatio nRecognized Identifiable Assets Acquired And Liabilities Assumed Financial Assets           559,400,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedFinancialAssets
/ us-gaap_BusinessAcquisitionAxis
= hban_CamcoFinancialMember
Macquarie Equipment Finance [Member]            
Business Acquisition Line Items            
BusinessAcquisitionNameOfAcquiredEntity     Macquarie Equipment Finance, Inc.      
BusinessCombinationReasonForBusinessCombination     The acquisition gives us the ability to drive added growth to our national equipment finance business as well as additional small business finance capabilities.      
Acquisition Date     Mar. 31, 2015      
PaymentsToAcquireBusinessesGross     457,800,000us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= hban_MacquarieEquipmentFinanceMember 		     
Business Combinatio nRecognized Identifiable Assets Acquired And Liabilities Assumed Financial Assets 838,600,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedFinancialAssets
/ us-gaap_BusinessAcquisitionAxis
= hban_MacquarieEquipmentFinanceMember 		  838,600,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedFinancialAssets
/ us-gaap_BusinessAcquisitionAxis
= hban_MacquarieEquipmentFinanceMember 		     
Total assets acquired as of acquisition date 1,100,000,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets
/ us-gaap_BusinessAcquisitionAxis
= hban_MacquarieEquipmentFinanceMember 		  1,100,000,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets
/ us-gaap_BusinessAcquisitionAxis
= hban_MacquarieEquipmentFinanceMember 		     
Total liabilities acquired as of acquisition date 616,600,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities
/ us-gaap_BusinessAcquisitionAxis
= hban_MacquarieEquipmentFinanceMember 		  616,600,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities
/ us-gaap_BusinessAcquisitionAxis
= hban_MacquarieEquipmentFinanceMember 		     
Goodwill $ 155,800,000us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= hban_MacquarieEquipmentFinanceMember 		  $ 155,800,000us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= hban_MacquarieEquipmentFinanceMember