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Fair Value Measurements (Estimated Fair Value Of Company Long Term Debt) (Details) (USD $) In Millions, unless otherwise specified	Aug. 03, 2013	Jul. 28, 2012
Notional Amount
Long-term debt	$ 6,125	$ 6,398
Carrying Amount
Long-term debt	6,308	6,603
Fair Value
Long-term debt	$ 6,650	$ 7,404

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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