Earnings Per Share - Schedule of Basic and Diluted EPS (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Feb. 22, 2026	Feb. 23, 2025	Feb. 22, 2026	Feb. 23, 2025
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Net earnings attributable to General Mills	$ 303.1	$ 625.6	$ 1,920.3	$ 2,001.2
Average number of common shares – basic EPS (in shares)	536.6	552.6	538.1	556.6
Average number of common shares - diluted EPS (in shares)	537.3	555.0	539.2	559.8
Earnings per share – basic (usd per share)	$ 0.57	$ 1.14	$ 3.57	$ 3.60
Earnings per share – diluted (usd per share)	$ 0.56	$ 1.12	$ 3.56	$ 3.57
Stock options
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Incremental share effect (in shares)	0.0	1.0	0.1	1.4
Restricted stock units and performance share units
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Incremental share effect (in shares)	0.7	1.4	1.0	1.8