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Fair Value - Additional Information (Detail) (USD $)	Oct. 27, 2012	Jul. 28, 2012
Disclosure Fair Value Additional Information [Abstract]
Investment in privately held companies	$ 239,000,000	$ 249,000,000
Loan Receivables And Financed Service Contracts And Others Carrying Value	1,900,000,000	1,900,000,000
Long-term Debt, Fair Value	18,700,000,000	18,800,000,000
Long-term Debt	$ 16,300,000,000	$ 16,300,000,000

Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date. May include notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, which had initial maturities beyond one year or beyond the normal operating cycle, if longer, and after deducting unamortized discount or premiums, if any.

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