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Goodwill, Purchased Technology and Other Intangible Assets (Future Estimated Amortization Expense) (Details) - USD ($)
$ in Millions
Oct. 27, 2019
Oct. 28, 2018
Future estimated amortization expense    
2020 $ 52  
2021 39  
2022 24  
2023 11  
2024 10  
Thereafter 20  
Carrying amount $ 156 $ 213