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Goodwill, Purchased Technology and Other Intangible Assets (Estimated Amortization Expense) (Details) (USD $)
In Millions, unless otherwise specified
Apr. 26, 2015
Oct. 26, 2014
Future estimated amortization expense    
2015 (remaining 6 months) $ 90us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear  
2016 175us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo  
2017 172us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree  
2018 171us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour  
2019 29us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive  
Thereafter 94us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive  
Total $ 731us-gaap_FiniteLivedIntangibleAssetsNet $ 824us-gaap_FiniteLivedIntangibleAssetsNet