Document and Entity Information
| Document and Entity Information | Apr. 25, 2022 |
| Document And Entity Information [Line Items] | |
| Entity Incorporation State Country Code | OH |
| Amendment Flag | false |
| Entity Central Index Key | 0000035527 |
| Document Type | 8-K |
| Document Period End Date | Apr. 25, 2022 |
| Entity Registrant Name | FIFTH THIRD BANCORP |
| Entity File Number | 001-33653 |
| Entity Tax Identification Number | 31-0854434 |
| Entity Address, Address Line One | Fifth Third Center |
| Entity Address, Address Line Two | 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 |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |
| Common Stock [Member] | |
| Document And Entity Information [Line Items] | |
| Security 12b Title | Common Stock, Without Par Value |
| Trading Symbol | FITB |
| Security Exchange Name | NASDAQ |
| Depositary Shares Representing A 11000th Ownership Interest In A Share Of 6.625 Fixed To Floating Rate Not Cumulative Perpetual Preferred Stock Series I 2 [Member] | |
| Document And Entity Information [Line Items] | |
| Security 12b Title | Depositary Shares Representing a 1/1000th Ownership Interest in a Share of 6.625% Fixed-to-Floating Rate Non-Cumulative Perpetual Preferred Stock |
| Trading Symbol | FITBI |
| Security Exchange Name | NASDAQ |
| Depositary Shares Representing A 140th Ownership Interest In A Share Of 6.00 Not Cumulative Perpetual Class B Preferred Stock Series A [Member] | |
| Document And Entity Information [Line Items] | |
| Security 12b Title | Depositary Shares Representing a 1/40th Ownership Interest in a Share of 6.00% Non-Cumulative Perpetual Class B Preferred Stock, Series A |
| Trading Symbol | FITBP |
| Security Exchange Name | NASDAQ |
| Depositary Shares Representing A 11000th Ownership Interest In A Share Of 4.95 Not Cumulative Perpetual Preferred Stock Series K [Member] | |
| Document And Entity Information [Line Items] | |
| Security 12b Title | Depositary Shares Representing a 1/1000th Ownership Interest in a Share of 4.95% Non-Cumulative Perpetual Preferred Stock, Series K |
| Trading Symbol | FITBO |
| Security Exchange Name | NASDAQ |