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Cover Page - USD ($)	12 Months Ended
Cover Page - USD ($)	Dec. 31, 2020	Jan. 31, 2021	Jun. 30, 2020
Entity Listings [Line Items]
Document Type	10-K
Document Period End Date	Dec. 31, 2020
Current Fiscal Year End Date	--12-31
Entity Registrant Name	FIFTH THIRD BANCORP
Document Annual Report	true
Document Transition Report	false
Entity File Number	001-33653
Entity Incorporation, State or Country Code	OH
Entity Tax Identification Number	31-0854434
Entity Address, Address Line One	38 Fountain Square Plaza
Entity Address, City or Town	Cincinnati
Entity Address, State or Province	OH
Entity Address, Postal Zip Code	45263
City Area Code	800
Local Phone Number	972-3030
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
ICFR Auditor Attestation Flag	true
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		708,697,950
Entity Public Float			$ 12,243,222,418
Documents Incorporated by Reference	DOCUMENTS INCORPORATED BY REFERENCE This report incorporates into a single document the requirements of the U.S. Securities and Exchange Commission (the “SEC”) with respect to annual reports on Form 10-K and annual reports to shareholders. Sections of the Bancorp’s Proxy Statement for the 2021 Annual Meeting of Shareholders are incorporated by reference into Part III of this report. Only those sections of this 2020 Annual Report to Shareholders that are specified in this Cross Reference Index constitute part of the registrant’s Form 10-K for the year ended December 31, 2020. No other information contained in this 2020 Annual Report to Shareholders shall be deemed to constitute any part of this Form 10-K nor shall any such information be incorporated into the Form 10-K and shall not be deemed “filed” as part of the registrant’s Form 10-K.
Amendment Flag	false
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	FY
Entity Central Index Key	0000035527
Common Stock, Without Par Value
Entity Listings [Line Items]
Title of 12(b) Security	Common Stock, Without Par Value
Trading Symbol	FITB
Security Exchange Name	NASDAQ
Preferred stock, Series I
Entity Listings [Line Items]
Title of 12(b) Security	6.625% Fixed-to-Floating Rate Non-Cumulative Perpetual Preferred Stock, Series I
Trading Symbol	FITBI
Security Exchange Name	NASDAQ
Class B Preferred stock, Series A
Entity Listings [Line Items]
Title of 12(b) Security	6.00% Non-Cumulative Perpetual Class B Preferred Stock, Series A
Trading Symbol	FITBP
Security Exchange Name	NASDAQ
Preferred Stock, Series K
Entity Listings [Line Items]
Title of 12(b) Security	4.95% Non-Cumulative Perpetual Preferred Stock, Series K
Trading Symbol	FITBO
Security Exchange Name	NASDAQ