Document and Entity Information	3 Months Ended
	Aug. 30, 2020 shares
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-Q
Document Period End Date	Aug. 30, 2020
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q1
Amendment Flag	false
Entity Common Stock, Shares Outstanding	488,518,073
Entity Emerging Growth Company	false
Entity Small Business	false
Entity Shell Company	false
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 Quarterly Report	true
Document Transition Report	false
Title of 12(b) Security	Common Stock, $5.00 par value
Trading Symbol	CAG
Security Exchange Name	NYSE