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Goodwill and Purchased Intangible Assets (Schedule Of Estimated Future Amortization Expense Of Purchased Intangible Assets) (Details) - USD ($)
$ in Millions
Apr. 30, 2016
Jul. 25, 2015
Finite-Lived Intangible Assets, Future Amortization Expense [Abstract]    
2016 (remaining three months) $ 211  
2017 742  
2018 595  
2019 502  
2020 276  
Thereafter 194  
Total purchased intangible assets with finite lives, net $ 2,520 $ 2,359