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INVENTORY
12 Months Ended
Dec. 31, 2018
Inventories [Abstract]  
INVENTORY
INVENTORY
 
 
2018

 
2017

Product inventory
 
$
297

 
$
285

Materials and supplies
 
658

 
609

 
 
$
955

 
$
894


The Company recorded a write-down of its product inventory of $13 million from cost to net realizable value as at December 31, 2018 (2017 - $33 million).