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Fair Value Measurements (Estimated Fair Value Of Company Long Term Debt) (Details) (USD $) In Millions, unless otherwise specified	Jul. 28, 2012	Jul. 30, 2011
Notional Amount
Long-term debt	$ 6,398	$ 5,907
Carrying Amount
Long-term debt	6,603	6,134
Fair Value
Long-term debt	$ 7,404	$ 6,557

Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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