Share-Based Payment Arrangement, Non Option Equity Instruments, Exercise Price Range, Lower Range Limit

No definition available.

Name:	fitb_ShareBasedPaymentArrangementNonOptionEquityInstrumentsExercisePriceRangeLowerRangeLimit
Namespace Prefix:	fitb_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	duration

- Definition

Share-Based Payment Arrangement, Non Option Equity Instruments, Exercise Price Range, Upper Range Limit

+ References

No definition available.

+ Details

Name:	fitb_ShareBasedPaymentArrangementNonOptionEquityInstrumentsExercisePriceRangeUpperRangeLimit
Namespace Prefix:	fitb_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	duration

- Definition

The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(i)-(ii)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

Weighted average remaining contractual term for equity-based awards excluding options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (e)(1)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingWeightedAverageRemainingContractualTerms
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

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

- Details

Name:	us-gaap_AwardTypeAxis=us-gaap_RestrictedStockUnitsRSUMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis=fitb_ExercisePriceRangeUnder15Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis=fitb_Range1520Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis=fitb_Range2025Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis=fitb_Range2530Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis=fitb_Range3035Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis=fitb_PriceRange3501AndOverMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Stock-Based Compensation - Outstanding RSUs by Grant-Date Fair Value (Details) - RSUs - $ / shares shares in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award
Number of Shares/Units Outstanding (in shares)	9,487	9,466	10,006	8,020
Weighted-Average Remaining Contractual Life (in years)	1 year 1 month 6 days
Under $15.00
Share-based Compensation Arrangement by Share-based Payment Award
Exercise Price Range, Upper Limit (in usd per share)	$ 15.00
Number of Shares/Units Outstanding (in shares)	36
Weighted-Average Remaining Contractual Life (in years)	1 year
$15.01-$20.00
Share-based Compensation Arrangement by Share-based Payment Award
Exercise Price Range, Lower Limit (in usd per share)	$ 15.01
Exercise Price Range, Upper Limit (in usd per share)	$ 20.00
Number of Shares/Units Outstanding (in shares)	231
Weighted-Average Remaining Contractual Life (in years)	2 months 12 days
$20.01-$25.00
Share-based Compensation Arrangement by Share-based Payment Award
Exercise Price Range, Lower Limit (in usd per share)	$ 20.01
Exercise Price Range, Upper Limit (in usd per share)	$ 25.00
Number of Shares/Units Outstanding (in shares)	235
Weighted-Average Remaining Contractual Life (in years)	7 months 6 days
$25.01-$30.00
Share-based Compensation Arrangement by Share-based Payment Award
Exercise Price Range, Lower Limit (in usd per share)	$ 25.01
Exercise Price Range, Upper Limit (in usd per share)	$ 30.00
Number of Shares/Units Outstanding (in shares)	4,376
Weighted-Average Remaining Contractual Life (in years)	9 months 18 days
$30.01-$35.00
Share-based Compensation Arrangement by Share-based Payment Award
Exercise Price Range, Lower Limit (in usd per share)	$ 30.01
Exercise Price Range, Upper Limit (in usd per share)	$ 35.00
Number of Shares/Units Outstanding (in shares)	3,835
Weighted-Average Remaining Contractual Life (in years)	1 year 3 months 18 days
$35.01 and over
Share-based Compensation Arrangement by Share-based Payment Award
Exercise Price Range, Lower Limit (in usd per share)	$ 35.01
Number of Shares/Units Outstanding (in shares)	774
Weighted-Average Remaining Contractual Life (in years)	1 year 10 months 24 days