v2.4.0.6
Fair Value - Additional Information (Detail) (USD $)
12 Months Ended
Jul. 28, 2012
Jul. 30, 2011
Fair Value Measurements [Line Items]    
Value of investments in privately held companies on cost basis $ 249,000,000  
Long term loan receivables and financed service contracts and others carrying value 1,900,000,000 2,000,000,000
Long-term debt, fair value 18,800,000,000 17,400,000,000
Long-term debt, carrying amount $ 16,297,000,000 $ 16,234,000,000