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Goodwill and Purchased Intangible Assets (Schedule Of Estimated Future Amortization Expense Of Purchased Intangible Assets) (Details) (USD $)
In Millions, unless otherwise specified
Apr. 25, 2015
Jul. 26, 2014
Finite-Lived Intangible Assets, Future Amortization Expense [Abstract]    
2015 (remaining three months) $ 223us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths  
2016 763us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo  
2017 590us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree  
2018 448us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour  
2019 345us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive  
Thereafter 168us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive  
Total purchased intangible assets with finite lives, net $ 2,537us-gaap_FiniteLivedIntangibleAssetsNet $ 3,148us-gaap_FiniteLivedIntangibleAssetsNet