Earnings per Share (Schedule of earnings per share) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Feb. 26, 2023	Feb. 27, 2022	Feb. 26, 2023	Feb. 27, 2022
Earnings Per Share [Abstract]
Net earnings attributable to General Mills	$ 553.1	$ 660.3	$ 1,979.0	$ 1,884.5
Average number of common shares - basic EPS	592.5	606.8	596.2	608.6
Earnings Per Share, Basic and Diluted [Abstract]
Average number of common shares - diluted EPS	599.0	612.4	602.4	613.5
Earnings per share - basic	$ 0.94	$ 1.09	$ 3.32	$ 3.10
Earnings per share - diluted	$ 0.92	$ 1.08	$ 3.28	$ 3.07
Stock Options [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Incremental share effect	3.7	2.9	3.6	2.4
Restricted stock units and performance share units [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Incremental share effect	2.8	2.7	2.6	2.5