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INVENTORY (Details) - USD ($)
$ in Millions
6 Months Ended
Apr. 30, 2019
Apr. 30, 2018
Oct. 31, 2018
Inventory, Net [Abstract]      
Finished goods $ 290   $ 283
Purchased parts and fabricated assemblies 370   336
Total inventory 660   $ 619
Excess and obsolete inventory-related charges $ 13 $ 11