Quarterly Data (Schedule Of Quarterly Financial Information) (Details) - USD ($) $ / shares in Units, $ 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
Quarterly Data (Unaudited) [Abstract]
Net sales	$ 5,030.0	$ 5,125.9	$ 5,220.7	$ 4,717.6	$ 4,891.2	$ 4,537.7	$ 5,024.0	$ 4,539.9	$ 20,094.2	$ 18,992.8	$ 18,127.0
Gross margin	1,728.2	1,664.8	1,705.1	1,447.7	1,769.9	1,403.7	1,631.2	1,597.4
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
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