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Capital Stock And Earnings Per Share (Narrative) (Details) (USD $)
 0 Months Ended 1 Months Ended 3 Months Ended
Feb. 02, 2012
Jan. 05, 2012
Apr. 30, 2012
Feb. 29, 2012
Apr. 28, 2012
Apr. 30, 2011
Jan. 17, 2012
Capital Unit [Line Items]              
Additional shares paid             1
Number of shares of common stock issued 372,000,000            
Shares repurchased and retired, shares         6,500,000    
Shares repurchased and retired, value         $ 250,000,000    
Stock repurchase program, common stock purchase value     1,000,000,000 2,000,000,000      
Common stock repurchased under stock repurchase program, shares     32,300,000        
Cash expenditures under stock repurchase programs         297,259,000 338,300,000  
Preferred stock, par value         $ 1    
Stock split, conversion ratio per share   2          
Preferred stock, shares authorized         5,000,000    
February 2012 Stock Repurchase Program [Member]
              
Capital Unit [Line Items]              
Shares repurchased and retired, shares         600,000    
Shares repurchased and retired, value         25,400,000    
Remaining available stock under stock repurchase plan         $ 1,974,600,000