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Fair Value Measurements Fair Value Measurements Narrative (Details) (USD $)
In Millions, unless otherwise specified
Jan. 27, 2013
Jul. 29, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash Equivalents, at Carrying Value $ 202 $ 80
Long-term Debt 3,250 2,408
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 2 [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash and Cash Equivalents, Fair Value Disclosure 202 80
Long-term Debt, Fair Value $ 3,461 $ 2,663