Earnings Per Share - Schedule of Basic and Diluted EPS (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Nov. 23, 2025	Nov. 24, 2024	Nov. 23, 2025	Nov. 24, 2024
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Net earnings attributable to General Mills	$ 413.0	$ 795.7	$ 1,617.2	$ 1,375.6
Average number of common shares – basic EPS (in shares)	536.4	556.9	538.8	558.7
Average number of common shares - diluted EPS (in shares)	537.3	560.4	540.0	562.2
Earnings per share – basic (usd per share)	$ 0.78	$ 1.43	$ 3.00	$ 2.46
Earnings per share – diluted (usd per share)	$ 0.78	$ 1.42	$ 3.00	$ 2.45
Stock options
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Incremental share effect (in shares)	0.1	1.9	0.2	1.7
Restricted stock units and performance share units
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Incremental share effect (in shares)	0.8	1.6	1.0	1.8