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Document and Entity Information - USD ($)
 12 Months Ended
May 30, 2021
Jun. 27, 2021
Nov. 27, 2020
Cover [Abstract]      
Entity Registrant Name CONAGRA BRANDS, INC.    
Entity Central Index Key 0000023217    
Current Fiscal Year End Date --05-30    
Entity Filer Category Large Accelerated Filer    
Document Type 10-K    
Document Period End Date May 30, 2021    
Document Fiscal Year Focus 2021    
Document Fiscal Period Focus FY    
Amendment Flag false    
Entity Public Float     $ 17,559,528,469
Entity Common Stock, Shares Outstanding   480,326,127  
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag true    
Entity Small Business false    
Entity Shell Company false    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
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    
Entity Incorporation, State or Country Code DE    
Entity Interactive Data Current Yes    
Document Annual Report true    
Document Transition Report false    
Title of 12(b) Security Common Stock, $5.00 par value    
Trading Symbol CAG    
Security Exchange Name NYSE    
Documents Incorporated by Reference

Portions of the Registrant’s definitive Proxy Statement for the Registrant's 2021 Annual Meeting of Stockholders (the "2021 Proxy Statement") are incorporated by reference into Part III.