Annual report pursuant to Section 13 and 15(d)

Other Regulatory Matters (Details)

v2.4.1.9
Other Regulatory Matters (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Huntington Bancshares Incorporated [Member]    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Tier 1 amount $ 6,265,900us-gaap_TierOneRiskBasedCapital
/ dei_LegalEntityAxis
= hban_HuntingtonBancsharesIncorporatedMember
$ 6,099,629us-gaap_TierOneRiskBasedCapital
/ dei_LegalEntityAxis
= hban_HuntingtonBancsharesIncorporatedMember
Tier 1 ratio 11.50%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= hban_HuntingtonBancsharesIncorporatedMember
12.28%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= hban_HuntingtonBancsharesIncorporatedMember
Risk based capital amount 7,388,336us-gaap_Capital
/ dei_LegalEntityAxis
= hban_HuntingtonBancsharesIncorporatedMember
7,239,035us-gaap_Capital
/ dei_LegalEntityAxis
= hban_HuntingtonBancsharesIncorporatedMember
Risk based capital ratio 13.56%us-gaap_CapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= hban_HuntingtonBancsharesIncorporatedMember
14.57%us-gaap_CapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= hban_HuntingtonBancsharesIncorporatedMember
Tier 1 Leverage amount 6,265,900us-gaap_TierOneLeverageCapital
/ dei_LegalEntityAxis
= hban_HuntingtonBancsharesIncorporatedMember
6,099,629us-gaap_TierOneLeverageCapital
/ dei_LegalEntityAxis
= hban_HuntingtonBancsharesIncorporatedMember
Tier 1 Leverage ratio 9.74%us-gaap_TierOneLeverageCapitalToAverageAssets
/ dei_LegalEntityAxis
= hban_HuntingtonBancsharesIncorporatedMember
10.67%us-gaap_TierOneLeverageCapitalToAverageAssets
/ dei_LegalEntityAxis
= hban_HuntingtonBancsharesIncorporatedMember
Huntington National Bank [Member]    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Tier 1 amount 6,136,190us-gaap_TierOneRiskBasedCapital
/ dei_LegalEntityAxis
= hban_HuntingtonNationalBankMember
5,682,067us-gaap_TierOneRiskBasedCapital
/ dei_LegalEntityAxis
= hban_HuntingtonNationalBankMember
Tier 1 ratio 11.28%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= hban_HuntingtonNationalBankMember
11.45%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= hban_HuntingtonNationalBankMember
Risk based capital amount 6,956,242us-gaap_Capital
/ dei_LegalEntityAxis
= hban_HuntingtonNationalBankMember
6,520,190us-gaap_Capital
/ dei_LegalEntityAxis
= hban_HuntingtonNationalBankMember
Risk based capital ratio 12.79%us-gaap_CapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= hban_HuntingtonNationalBankMember
13.14%us-gaap_CapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= hban_HuntingtonNationalBankMember
Tier 1 Leverage amount $ 6,136,190us-gaap_TierOneLeverageCapital
/ dei_LegalEntityAxis
= hban_HuntingtonNationalBankMember
$ 5,682,067us-gaap_TierOneLeverageCapital
/ dei_LegalEntityAxis
= hban_HuntingtonNationalBankMember
Tier 1 Leverage ratio 9.56%us-gaap_TierOneLeverageCapitalToAverageAssets
/ dei_LegalEntityAxis
= hban_HuntingtonNationalBankMember
9.97%us-gaap_TierOneLeverageCapitalToAverageAssets
/ dei_LegalEntityAxis
= hban_HuntingtonNationalBankMember