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Capital Stock and Earnings Per Share - Additional Information (Detail) (USD $)
 0 Months Ended 1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Feb. 02, 2012
Jan. 05, 2012
Apr. 30, 2012
Feb. 29, 2012
Jul. 28, 2012
Jul. 28, 2012
Jul. 30, 2011
Jan. 28, 2012
Jan. 17, 2012
Capital Unit [Line Items]                  
Stock split, conversion ratio per share   2           2  
Additional shares paid                 1
Number of shares of common stock issued 372,000,000                
Shares repurchased and retired, shares         7,100,000 13,600,000      
Shares repurchased and retired, value         $ 299,900,000 $ 549,900,000      
Cash expenditures under repurchase programs           596,971,000 671,300,000    
Stock repurchase program, common stock purchase value     1,000,000,000 2,000,000,000          
Repurchase of common stock in shares     32,300,000            
Preferred stock, shares authorized         5,000,000 5,000,000      
Preferred stock, par value         $ 1 $ 1      
February 2012 Stock Repurchase Program
                  
Capital Unit [Line Items]                  
Remaining available stock under stock repurchase plan           $ 1,674,700,000