| Document And Entity Information | Oct. 06, 2022 |
| Document Information [Line Items] | |
| Entity, Registrant Name | Conagra Brands, Inc. |
| Document, Type | 8-K |
| Document, Period End Date | Oct. 06, 2022 |
| Entity, Incorporation, State or Country Code | DE |
| Entity, File Number | 1-7275 |
| Entity, Tax Identification Number | 47-0248710 |
| Entity, Address, Address Line One | 222 W. Merchandise Mart Plaza |
| Entity, Address, Address Line Two | Suite 1300 |
| Entity, Address, City or Town | Chicago |
| Entity, Address, State or Province | IL |
| Entity, Address, Postal Zip Code | 60654 |
| City Area Code | 312 |
| Local Phone Number | 549-5000 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common Stock |
| Trading Symbol | CAG |
| Security Exchange Name | NYSE |
| Entity, Emerging Growth Company | false |
| Amendment Flag | false |
| Entity, Central Index Key | 0000023217 |
