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Goodwill, Purchased Technology and Other Intangible Assets (Estimated Amortization Expense) (Details) - USD ($)
$ in Millions
Jul. 28, 2019
Oct. 28, 2018
Future estimated amortization expense    
2019 (remaining 3 months) $ 14  
2020 52  
2021 39  
2022 24  
2023 11  
Thereafter 30  
Total $ 170 $ 213