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

For mortgages held for sale for which the fair value option has been elected, this item represents the aggregate unpaid principal balance.

No definition available.

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

Mortgages Held To Maturity Unpaid Principal

No definition available.

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

Mortgages Held-to-maturity, Fair Value Disclosure

No definition available.

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

This item represents the difference between the aggregate fair value and the aggregate unpaid principal balance of loans and long-term receivables (other than securities categorized as trading, available-for-sale or held-to-maturity) that have contractual principal amounts and for which the fair value option has been elected.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 28
-Subparagraph (d)(1)
-URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14064-108612

Name:	us-gaap_FairValueOptionAggregateDifferencesLoansAndLongTermReceivables
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

No definition available.

Name:	us-gaap_FairValueOptionQuantitativeDisclosuresLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Fair value portion of loan receivable, including, but not limited to, mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Glossary Loan
-URI http://asc.fasb.org/extlink&oid=6517073

Name:	us-gaap_LoansReceivableFairValueDisclosure
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Fair value portion of mortgage loans held-for-sale.

No definition available.