Annual report pursuant to Section 13 and 15(d)

Other Regulatory Matters (Details)

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Other Regulatory Matters (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Huntington Bancshares Incorporated [Member]
   
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Tier 1 amount $ 5,557 $ 5,022
Tier 1 ratio 12.11% 11.55%
Risk based capital amount 6,778 6,285
Risk based capital ratio 14.77% 14.46%
Tier 1 Leverage amount 5,557 5,022
Tier 1 Leverage ratio 10.28% 9.41%
Huntington National Bank [Member]
   
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Tier 1 amount 4,245 3,683
Tier 1 ratio 9.30% 8.51%
Risk based capital amount 5,753 5,549
Risk based capital ratio 12.60% 12.82%
Tier 1 Leverage amount $ 4,245 $ 3,683
Tier 1 Leverage ratio 7.89% 6.97%