Cover - shares	6 Months Ended
	Nov. 28, 2021	Dec. 14, 2021
Cover [Abstract]
Document Type	10-Q
Amendment Flag	false
Entity Central Index Key	0000040704
Document Quarterly Report	true
Document Transition Report	false
Document Period End Date	Nov. 28, 2021
Document Fiscal Period Focus	Q2
Document Fiscal Year Focus	2022
Current Fiscal Year End Date	--05-29
Entity File Number	001-01185
Entity Registrant Name	GENERAL MILLS, INC.
Entity Incorporation State Country Code	DE
Entity Tax Identification Number	41-0274440
Entity Address Address Line 1	Number One General Mills Boulevard
Entity Address City or Town	Minneapolis
Entity Address State or Province	MN
Entity Address Postal Zip Code	55426
City Area Code	(763)
Local Phone Number	764-7600
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
Entity Shell Company	false
Entity Common Stock Shares Outstanding		603,206,700
Shares held in the treasury		151,406,628
Common Stock, $.10 par value [Member]
Entity Listings [Line Items]
Security 12b Title	Common Stock, $.10 par value
Trading Symbol	GIS
Security Exchange Name	NYSE
1.000% Notes due 2023 [Member]
Entity Listings [Line Items]
Security 12b Title	1.000% Notes due 2023
Trading Symbol	GIS23A
Security Exchange Name	NYSE
0.125% Notes due 2025 [Member]
Entity Listings [Line Items]
Security 12b Title	0.125% Notes due 2025
Trading Symbol	GIS25A
Security Exchange Name	NYSE
0.450% Notes due 2026 [Member]
Entity Listings [Line Items]
Security 12b Title	0.450% Notes due 2026
Trading Symbol	GIS26
Security Exchange Name	NYSE
1.500% Notes due 2027 [Member]
Entity Listings [Line Items]
Security 12b Title	1.500% Notes due 2027
Trading Symbol	GIS27
Security Exchange Name	NYSE