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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
Jan. 24, 2015
Jul. 26, 2014
Finite-Lived Intangible Assets, Future Amortization Expense [Abstract]    
2015 (remaining six months) $ 462us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths  
2016 734us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo  
2017 561us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree  
2018 420us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour  
2019 317us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive  
Thereafter 150us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive  
Total purchased intangible assets with finite lives, net $ 2,644us-gaap_FiniteLivedIntangibleAssetsNet $ 3,148us-gaap_FiniteLivedIntangibleAssetsNet