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Balance Sheet Detail (Inventories) (Details) - USD ($)
$ in Millions
May. 01, 2016
Oct. 25, 2015
Inventories    
Customer service spares $ 412 $ 382
Raw materials 475 461
Work-in-process 337 271
Finished goods 700 719
Total Inventories 1,924 1,833
Inventory at customer locations included in finished goods 131 155
Inventory, finished goods, evaluation inventory, net of reserves $ 189 $ 185