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Employees' Stock Incentive Plans and Management Incentive Plans 7 (Details) (USD $)
In Millions, except Share data, unless otherwise specified
12 Months Ended 38 Months Ended 12 Months Ended 0 Months Ended
Apr. 28, 2013
Apr. 29, 2012
Feb. 15, 2012
Apr. 27, 2011
Feb. 15, 2011
Apr. 29, 2012
Apr. 28, 2013
Selling, General and Administrative Expenses [Member]
Long-term Performance Program [Member]
Apr. 29, 2012
Selling, General and Administrative Expenses [Member]
Long-term Performance Program [Member]
Apr. 27, 2011
Selling, General and Administrative Expenses [Member]
Long-term Performance Program [Member]
Jun. 08, 2013
Subsequent Event [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]                    
Business Acquisition per share price 2                   $ 72.50
Share-based Compensation Arrangement by Share-based Payment Award, Discount from Market Price, Offering Date           95.00%        
Stock Issued During Period, Shares, Employee Stock Purchase Plans 5,000,000   121,460   165,635          
Other Labor-related Expenses $ 32 $ 34   $ 45            
Performance Period In Years For Dividends Paid 2 years                  
Number Of Trading Days For L T T P Peer Group Company Stock Price 60 days                  
Compensation cost recognized in SG&A                    
Pre-tax compensation cost             17.3 18.4 21.5  
Tax benefit             6.1 6.5 7.4  
After-tax compensation cost             $ 11.2 $ 11.9 $ 14.1