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Balance Sheet Detail - Inventories (Details) - USD ($)
$ in Millions
Jan. 31, 2021
Oct. 25, 2020
Inventories    
Customer service spares $ 1,290 $ 1,270
Raw materials 879 870
Work-in-process 687 624
Finished goods 1,069 1,140
Inventories 3,925 3,904
Inventory at customer locations included in finished goods 21 16
Inventory, finished goods, evaluation inventory, net of reserves $ 396 $ 416