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Goodwill, Purchased Technology and Other Intangible Assets (Estimated Amortization Expense) (Details) - USD ($)
$ in Millions
Apr. 30, 2017
Oct. 30, 2016
Future estimated amortization expense    
2017 (remaining 6 months) $ 95  
2018 189  
2019 48  
2020 42  
2021 36  
Thereafter 62  
Total $ 472 $ 550