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INVENTORY (Tables)
6 Months Ended
Apr. 30, 2018
Inventory, Net [Abstract]  
INVENTORY
6. INVENTORY
 
 
April 30,
2018
 
October 31,
2017
 
(in millions)
Finished goods
$
367

 
$
363

Purchased parts and fabricated assemblies
227

 
212

Inventory
$
594

 
$
575