Annual report pursuant to Section 13 and 15(d)

Document and Entity Information

v2.4.0.6
Document and Entity Information (USD $)
12 Months Ended
Dec. 31, 2012
Jun. 30, 2012
Document and Entity Information [Abstract]    
Entity Registrant Name HUNTINGTON BANCSHARES INC/MD  
Entity Central Index Key 0000049196  
Document Type 10-K  
Document Period End Date Dec. 31, 2012  
Amendment Flag false  
Document Fiscal Year Focus 2012  
Document Fiscal Period Focus FY  
Current Fiscal Year End Date --12-31  
Entity Well-known Seasoned Issuer Yes  
Entity Voluntary Filers No  
Entity Current Reporting Status Yes  
Entity Filer Category Large Accelerated Filer  
Entity Public Float   $ 5,349,102,938
Entity Common Stock, Shares Outstanding 842,812,709