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Goodwill, Purchased Technology and Other Intangible Assets (Estimated Amortization Expense) (Details) - USD ($)
$ in Millions
Jul. 26, 2015
Oct. 26, 2014
Future estimated amortization expense    
2015 (remaining 3 months) $ 48  
2016 189  
2017 186  
2018 185  
2019 66  
Thereafter 111  
Total $ 785 $ 824