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Retirement Benefits and Postemployment Benefits (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
May 26, 2013
May 27, 2012
May 29, 2011
Defined Benefit Plan, Information About Plan Assets      
Accumulated Benefit Obligation $ 4,888.8 $ 4,504.7  
Defined Contribution Pension And Other Postretirement Plans Disclosure [Abstract]      
Net assets money purchase plan 19.4 18.7  
Cost recognized 46.0 41.8 41.8
ESOP number of allocated shares 9.1 10.6  
Common stock held by ESOP and company stock fund 691.9 638.6  
Defined Contribution Plan, Employer Discretionary Contribution Amount 200.0 200.0  
Health care cost trend rate for next year 8.00% 8.50%  
Rate to which the cost trend rate is assumed to decline (ultimate rate) 5.20% 5.20%  
Defined Benefit Pension Plans [Member]
     
Defined Benefit Plan, Information About Plan Assets      
Target allocation percentage of assets fixed income funds 35.00%    
Target allocation percentage of assets real assets 15.00%    
Actual Return Attributable To Unrealized Gain Loss On Plan Assets Still Held 6.3    
Defined Benefit Pension Plans [Member] | United States Equity Securities [Member]
     
Defined Benefit Plan, Information About Plan Assets      
Target Allocation Percentage of Assets Equity Securities 25.00%    
Defined Benefit Pension Plans [Member] | International Equity Securities [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%    
United States Pension Plans of US Entity, Defined Benefit [Member]
     
Defined Benefit Plan, Information About Plan Assets      
Retirement Plan Provision Termination Period 5 years    
Other Postretirement Benefit Plans [Member]
     
Defined Benefit Plan, Information About Plan Assets      
Target allocation percentage of assets fixed income funds 30.00%    
Target allocation percentage of assets real assets 10.00%    
Actual Return Attributable To Unrealized Gain Loss On Plan Assets Still Held $ 0.9    
Other Postretirement Benefit Plans [Member] | United States Equity Securities [Member]
     
Defined Benefit Plan, Information About Plan Assets      
Target Allocation Percentage of Assets Equity Securities 30.00%    
Other Postretirement Benefit Plans [Member] | International Equity Securities [Member]
     
Defined Benefit Plan, Information About Plan Assets      
Target Allocation Percentage of Assets Equity Securities 20.00%    
Other Postretirement Benefit Plans [Member] | Private Equities [Member]
     
Defined Benefit Plan, Information About Plan Assets      
Target Allocation Percentage of Assets Equity Securities 10.00%