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Acquistion (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Apr. 28, 2013
Oct. 28, 2012
Jul. 29, 2012
Apr. 28, 2013
Aug. 06, 2012
Business Acquisition [Line Items]          
Business Acquisition, Cost of Acquired Entity, Purchase Price         $ 1,550
Business Combination, Initial Purchase Price Adjustment         20
Business Combination, Purchase Price Adjustment 11        
Business Combination, Acquisition Related Costs   10 5 10  
Business Combination, Acquisition Related After Tax Costs   7 3    
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual 205     571  
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual 6     8  
Business Acquisition, Purchase Price Allocation, Goodwill Amount         691
Business Acquisition, Purchase Price Allocation, Goodwill, Expected Tax Deductible Amount         $ 284