Earnings Per Share (Schedule of Basic and Diluted EPS) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended								12 Months Ended
	May 28, 2023	Feb. 26, 2023	Nov. 27, 2022	Aug. 28, 2022	May 29, 2022	Feb. 27, 2022	Nov. 28, 2021	Aug. 29, 2021	May 28, 2023	May 29, 2022	May 30, 2021
Earnings Per Share [Abstract]
Net earnings attributable to General Mills	$ 614.9	$ 553.1	$ 605.9	$ 820.0	$ 822.8	$ 660.3	$ 597.2	$ 627.0	$ 2,593.9	$ 2,707.3	$ 2,339.8
Average number of common shares - basic EPS									594.8	607.5	614.1
Earnings Per Share, Basic and Diluted [Abstract]
Average number of common shares - diluted EPS									601.2	612.6	619.1
Earnings per share - basic	$ 1.04	$ 0.94	$ 1.01	$ 1.37	$ 1.36	$ 1.09	$ 0.98	$ 1.03	$ 4.36	$ 4.46	$ 3.81
Earnings per share - diluted	$ 1.03	$ 0.92	$ 1.01	$ 1.35	$ 1.36	$ 1.08	$ 0.97	$ 1.02	$ 4.31	$ 4.42	$ 3.78
Other Disclosures [Abstract]
Anti-dilutive stock options, restricted stock units, and performance share units									0.8	4.4	3.4
Stock options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Incremental share effect									3.6	2.5	2.5
Restricted stock units and performance share units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Incremental share effect									2.8	2.6	2.5