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Goodwill And Intangible Assets (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
9 Months Ended 9 Months Ended 0 Months Ended
Apr. 27, 2014
Apr. 28, 2013
Jul. 28, 2013
Apr. 27, 2014
Minimum [Member]
Apr. 27, 2014
Maximum [Member]
Aug. 08, 2013
Kelsen [Member]
Finite-Lived Intangible Assets [Line Items]            
Payments to Acquire Businesses, Gross           $ 331
Goodwill 2,431   2,297     136
Amortization of Intangible Assets 13 11        
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months 18          
Finite-Lived Intangible Assets, Amortization Expense, Year Two 18          
Finite Lived Intangible Assets, Amortization Expense, Year Three 18          
Finite Lived Intangible Assets, Amortization Expense, Year Four 18          
Finite Lived Intangible Assets, Amortization Expense, Year Five $ 14          
Finite-Lived Intangible Asset, Useful Life       5 years 20 years