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Pension and Postretirement Benefits (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
May 27, 2012
May 29, 2011
May 30, 2010
Change in Plan Assets      
Fair value of plan assets at beginning of year $ 2,543.9    
Investment and administrative expenses (1,997.7) (1,509.9) (1,987.7)
Fair value of plan assets at end of year 2,766.6 2,543.9  
Pension Benefits [Member]
     
Change in Benefit Obligation      
Benefit obligation at beginning of year 2,881.4 2,614.1  
Service cost 68.7 59.7 49.8
Interest cost 149.2 147.5 148.1
Amendments 5.3 1.5  
Actuarial loss 337.5 190.9  
Special termination benefits   1.3  
Benefits paid (138.8) (133.6)  
Business combination 25.0    
Benefit obligation at ending of year 3,328.3 2,881.4 2,614.1
Change in Plan Assets      
Fair value of plan assets at beginning of year 2,543.9 2,144.6  
Actual return on plan assets 24.8 418.3  
Employer contributions 326.4 129.4  
Investment and administrative expenses (14.2) (14.8)  
Benefits paid (138.8) (133.6)  
Business combination 24.5    
Fair value of plan assets at end of year 2,766.6 2,543.9 2,144.6
Other Benefits [Member]
     
Change in Benefit Obligation      
Benefit obligation at beginning of year 322.6 324.9  
Service cost 0.6 0.6 0.5
Interest cost 13.2 16.3 18.3
Plan participants' contributions 6.7 6.9  
Amendments (40.6) (9.0)  
Actuarial loss 11.6 19.4  
Benefits paid (36.0) (36.5)  
Business combination 4.6    
Benefit obligation at ending of year 282.7 322.6 324.9
Change in Plan Assets      
Fair value of plan assets at beginning of year 0.1 4.0  
Employer contributions 29.3 25.7  
Plan participants' contributions 6.7 6.9  
Benefits paid (36.0) (36.5)  
Fair value of plan assets at end of year $ 0.1 $ 0.1 $ 4.0