Document and Entity Information - USD ($)	12 Months Ended
	May 26, 2019	Jun. 23, 2019	Nov. 23, 2018
Document and Entity Information [Abstract]
Entity Registrant Name	CONAGRA BRANDS INC.
Entity Central Index Key	0000023217
Current Fiscal Year End Date	--05-26
Entity Filer Category	Large Accelerated Filer
Document Type	10-K
Document Period End Date	May 26, 2019
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	FY
Amendment Flag	false
Entity Common Stock, Shares Outstanding		486,129,815
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Shell Company	false
Entity Emerging Growth Company	false
Entity Small Business	false
Entity Public Float			$ 16,118,457,515