Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements (Estimated Fair Values of Company's Long-Term Debt) (Details)

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Fair Value Measurements (Estimated Fair Values of Company's Long-Term Debt) (Details) (USD $)
In Millions
Jul. 30, 2011
Jul. 31, 2010
Notional Amount [Member]
   
Long-term debt $ 5,907 $ 7,207
Carrying Amount [Member]
   
Long-term debt 6,134 7,464
Fair Value [Member]
   
Long-term debt $ 6,557 $ 7,324