Debt Instrument, Redemption Period Prior To Maturity Date

No definition available.

Name:	fitb_DebtInstrumentRedemptionPeriodPriorToMaturityDate
Namespace Prefix:	fitb_
Data Type:	xbrli:durationItemType
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Period Type:	duration

- Definition

Notional amount of floating interest rate debt with interest rate hedge.

+ References

No definition available.

+ Details

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Namespace Prefix:	fitb_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of outstanding long-term debt or borrowing associated with any securities or credit agreement for which there has been a default in principal, interest, sinking fund, or redemption provisions, or any breach of covenant that existed at the end of the period and subsequently has not been cured.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(c))
-URI https://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

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Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

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-SubTopic 20
-Section 50
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+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 6
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+ Details

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Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

+ Details

Name:	us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

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.

+ References

No definition available.

+ Details

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

- Definition

Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
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+ Details

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- Details

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- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=fitb_FixedRate825PercentNotesDue2038Member
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- Details

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- Details

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Period Type:

Long-Term Debt - Subordinated Debt (Details) - Parent Company - Subordinated Debt - USD ($)	Apr. 25, 2022	Nov. 20, 2013	Dec. 31, 2022
Fixed Rate 8.25% Notes Due 2038
Debt Instrument
Issue of senior notes to third party investors			$ 1,000,000,000
Interest rate (as a percent)			8.25%
Amount of debt converted to floating rate			$ 705,000,000
Interest rate paid (as a percent)			7.81%
Fixed Rate 8.25% Notes Due 2038 \| LIBOR
Debt Instrument
Basis spread on variable rate (as a percent)	3.05%
Fixed Rate 4.30% Notes Due 2024
Debt Instrument
Interest rate (as a percent)		4.30%	4.30%
Principal amount		$ 750,000,000
Redemption period prior to maturity date		30 days
Redemption price (as a percent)		100.00%