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Inventory
 12 Months Ended
Dec. 31, 2020
Inventories [Abstract]  
Inventory Inventory
 
2020

2019
Product inventory
$390 

$468 
Materials and supplies
670 

684 
 
$1,060 $1,152 
The Company recorded a write-down of its product inventory of $nil from cost to net realizable value as at December 31, 2020 (2019 – $4 million).