Name:	fitb_CommercialLoansOnNonaccrualStatus
Namespace Prefix:	fitb_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Financing Receivable, Accrual, Threshold Period Past Due

No definition available.

Name:	fitb_FinancingReceivableAccrualThresholdPeriodPastDue
Namespace Prefix:	fitb_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

Financing Receivable, Foreclosure Process, Period

No definition available.

Name:	fitb_FinancingReceivableForeclosureProcessPeriod
Namespace Prefix:	fitb_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

Financing Receivable, Nonaccrual, Threshold Period Past Due

No definition available.

Name:	fitb_FinancingReceivableNonaccrualThresholdPeriodPastDue
Namespace Prefix:	fitb_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

Financing Receivable, Nonaccrual, Threshold Period Past Due, With Senior Lien In Default

No definition available.

Name:	fitb_FinancingReceivableNonaccrualThresholdPeriodPastDueWithSeniorLienInDefault
Namespace Prefix:	fitb_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

Financing Receivable, Senior Lien, Threshold Period Past Due

No definition available.

Name:	fitb_FinancingReceivableSeniorLienThresholdPeriodPastDue
Namespace Prefix:	fitb_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

Financing Receivable, Troubled Debt Restructuring On Accrual Status, Payment History, Period

No definition available.

Name:	fitb_FinancingReceivableTroubledDebtRestructuringOnAccrualStatusPaymentHistoryPeriod
Namespace Prefix:	fitb_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

Financing Receivable, Troubled Debt Restructuring, Threshold Period Past Due

No definition available.

Name:	fitb_FinancingReceivableTroubledDebtRestructuringThresholdPeriodPastDue
Namespace Prefix:	fitb_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

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

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_CommercialPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_ResidentialPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_ResidentialMortgageMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_ConsumerPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_HomeEquityLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_CreditCardReceivablesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: