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Restructuring And Other Charges - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Jul. 28, 2012
Jul. 30, 2011
Jul. 31, 2010
Restructuring Cost and Reserve [Line Items]      
Pre-tax restructuring charges $ 1,000    
Restructuring charges 304 124  
Employee severance charges 250    
Other restructuring charges 54    
Impairment of Intangible assets 12 164 28
Juarez
     
Restructuring Cost and Reserve [Line Items]      
Reduction of goodwill   63  
Impairment of Intangible assets   8  
Maximum
     
Restructuring Cost and Reserve [Line Items]      
Pre-tax restructuring charges $ 1,100