BENEFIT PLANS - Dividends (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Pension Benefits
Defined Benefit Plan, Information about Plan Assets:
Dividends received on shares of Huntington stock	$ 0	$ 267

Defined Benefit Plan, Dividends Received on Employer and Related Party Securities Included in Plan Assets

No definition available.

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Namespace Prefix:	hban_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant