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Balance Sheet Detail (Inventories) (Details) - USD ($)
$ in Millions
Jul. 29, 2018
Oct. 29, 2017
Inventories    
Customer service spares $ 829 $ 595
Raw materials 978 603
Work-in-process 603 468
Finished goods 1,271 1,264
Total Inventories 3,681 2,930
Inventory at customer locations included in finished goods 129 331
Inventory, finished goods, evaluation inventory, net of reserves $ 342 $ 281