Fair Value - Additional Information (Detail) (USD $)	12 Months Ended
	Jul. 27, 2013	Jul. 28, 2012
Fair Value Measurements [Line Items]
Carrying Value of investments in privately held companies on cost basis	$ 242,000,000
Long-term Debt, Noncurrent Portion	16,201,000,000	16,297,000,000
Level 3
Fair Value Measurements [Line Items]
Long term loan receivables and financed service contracts and others carrying value	2,100,000,000	1,900,000,000
Level 2
Fair Value Measurements [Line Items]
Long-term debt, fair value	17,600,000,000	18,800,000,000
Long-term Debt, Noncurrent Portion	$ 16,200,000,000	$ 16,300,000,000