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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
Aug. 29, 2021
Aug. 30, 2020
Earnings Per Share [Abstract]    
Net earnings attributable to General Mills $ 627.0 $ 638.9
Average number of common shares - basic EPS 610.4 614.1
Earnings Per Share, Basic and Diluted [Abstract]    
Average number of common shares - diluted EPS 614.8 619.8
Earnings per share - basic $ 1.03 $ 1.04
Earnings per share - diluted $ 1.02 $ 1.03
Stock Options [Member]    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Incremental share effect 2.1 3.2
Restricted stock units and performance share units [Member]    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Incremental share effect 2.3 2.5