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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. 27, 2022
Feb. 28, 2021
Feb. 27, 2022
Feb. 28, 2021
Earnings Per Share [Abstract]        
Net earnings attributable to General Mills $ 660.3 $ 595.7 $ 1,884.5 $ 1,923.0
Average number of common shares - basic EPS 606.8 615.0 608.6 614.6
Earnings Per Share, Basic and Diluted [Abstract]        
Average number of common shares - diluted EPS 612.4 619.4 613.5 619.6
Earnings per share - basic $ 1.09 $ 0.97 $ 3.10 $ 3.13
Earnings per share - diluted $ 1.08 $ 0.96 $ 3.07 $ 3.10
Stock Options [Member]        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Incremental share effect 2.9 2.0 2.4 2.6
Restricted stock units and performance share units [Member]        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Incremental share effect 2.7 2.4 2.5 2.4