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Balance Sheet Detail (Inventories) (Details) - USD ($)
$ in Millions
Jul. 28, 2019
Oct. 28, 2018
Inventories    
Customer service spares $ 1,249 $ 989
Raw materials 849 1,020
Work-in-process 548 505
Finished goods 893 1,207
Inventories 3,539 3,721
Inventory at customer locations included in finished goods 11 19
Inventory, finished goods, evaluation inventory, net of reserves $ 327 $ 350