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Retirement Benefits and Postemployment Benefits (Narrative) (Details) - USD ($)
shares in Millions, $ in Millions
12 Months Ended
May 27, 2018
May 28, 2017
May 29, 2016
Defined Benefit Plan, Information About Plan Assets      
Accumulated benefit obligation $ 6,076.6 $ 6,104.5  
Defined Contribution Plan Disclosure [Line Items]      
Net assets of money purchase plan 23.9 23.0  
Recognized expense 49.2 54.1 $ 61.2
Defined Benefit Pension Plans [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Employer contributions $ 41.8 25.4  
Defined Benefit Pension Plans [Member] | United States Equities [Member]      
Defined Benefit Plan, Information About Plan Assets      
Target Allocation, Percentage of Assets Equity Securities 20.00%    
Defined Benefit Pension Plans [Member] | International Equities [Member]      
Defined Benefit Plan, Information About Plan Assets      
Target Allocation, Percentage of Assets Equity Securities 15.00%    
Defined Benefit Pension Plans [Member] | Private Equities [Member]      
Defined Benefit Plan, Information About Plan Assets      
Target Allocation, Percentage of Assets Equity Securities 10.00%    
Defined Benefit Pension Plans [Member] | Fixed income [Member]      
Defined Benefit Plan, Information About Plan Assets      
Target Allocation, Percentage of Assets Equity Securities 40.00%    
Defined Benefit Pension Plans [Member] | Real assets [Member]      
Defined Benefit Plan, Information About Plan Assets      
Target Allocation, Percentage of Assets Equity Securities 15.00%    
Defined Benefit Pension Plans [Member] | United States [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Employer contributions $ 0.0 0.0 $ 0.0
Defined Benefit Plan, Information About Plan Assets      
Retirement Plan Provision Termination Period 5 years    
Decline in projected benefit obligation as of fiscal year end $ (130.9)    
Other Postretirement Benefit Plans [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Employer contributions $ 0.1 20.1  
Other Postretirement Benefit Plans [Member] | United States Equities [Member]      
Defined Benefit Plan, Information About Plan Assets      
Target Allocation, Percentage of Assets Equity Securities 15.00%    
Other Postretirement Benefit Plans [Member] | International Equities [Member]      
Defined Benefit Plan, Information About Plan Assets      
Target Allocation, Percentage of Assets Equity Securities 10.00%    
Other Postretirement Benefit Plans [Member] | Private Equities [Member]      
Defined Benefit Plan, Information About Plan Assets      
Target Allocation, Percentage of Assets Equity Securities 5.00%    
Other Postretirement Benefit Plans [Member] | Fixed income [Member]      
Defined Benefit Plan, Information About Plan Assets      
Target Allocation, Percentage of Assets Equity Securities 65.00%    
Other Postretirement Benefit Plans [Member] | Real assets [Member]      
Defined Benefit Plan, Information About Plan Assets      
Target Allocation, Percentage of Assets Equity Securities 5.00%    
Other Postretirement Benefit Plans [Member] | United States [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Employer contributions $ 0.0 $ 20.0  
General Mills Savings Plan [Member]      
Defined Contribution Plan Disclosure [Line Items]      
ESOP number of allocated shares 5.6 6.3  
Common stock held by ESOP and company stock fund $ 392.1 $ 598.7