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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 6 Months Ended
Nov. 27, 2022
Nov. 28, 2021
Nov. 27, 2022
Nov. 28, 2021
Earnings Per Share [Abstract]        
Net earnings attributable to General Mills $ 605.9 $ 597.2 $ 1,425.9 $ 1,224.2
Average number of common shares - basic EPS 595.9 608.6 598.0 609.5
Earnings Per Share, Basic and Diluted [Abstract]        
Average number of common shares - diluted EPS 602.0 613.0 604.0 613.8
Earnings per share - basic $ 1.01 $ 0.98 $ 2.38 $ 2.01
Earnings per share - diluted $ 1.01 $ 0.97 $ 2.36 $ 1.99
Stock Options [Member]        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Incremental share effect 3.7 2.2 3.6 2.1
Restricted stock units and performance share units [Member]        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Incremental share effect 2.4 2.2 2.4 2.2