Document And Entity Information - USD ($)	12 Months Ended
	May 29, 2022	Jun. 26, 2022	Nov. 26, 2021
Document Information [Line Items]
Entity Central Index Key	0000023217
Entity Registrant Name	CONAGRA BRANDS INC.
Amendment Flag	false
Current Fiscal Year End Date	--05-29
Document Fiscal Period Focus	FY
Document Fiscal Year Focus	2022
Document Type	10-K
Document Annual Report	true
Document Period End Date	May 29, 2022
Document Transition Report	false
Entity File Number	1-7275
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	47-0248710
Entity Address, Address Line One	222 W. Merchandise Mart Plaza, 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
Title of 12(b) Security	Common Stock, $5.00 par value
Trading Symbol	CAG
Security Exchange Name	NYSE
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
ICFR Auditor Attestation Flag	true
Entity Shell Company	false
Entity Public Float			$ 15,158,448,300
Entity Common Stock, Shares Outstanding		480,091,813
Auditor Name	KPMG LLP
Auditor Location	Omaha, Nebraska
Auditor Firm ID	185