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INVENTORY (Details) - USD ($)
$ in Millions
3 Months Ended
Jan. 31, 2020
Jan. 31, 2019
Oct. 31, 2019
Inventory, Net [Abstract]      
Finished goods $ 342   $ 317
Purchased parts and fabricated assemblies 395   388
Total inventory 737   $ 705
Excess and obsolete inventory-related charges $ 7 $ 7