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INVENTORY | 12 Months Ended
--- | ---
Dec. 31, 2017
Inventories [Abstract] |
INVENTORY | INVENTORY
|  | 2017 |  |  | 2016 |
Product inventory |  | $ | 285 |  |  | $ | 263 |
Materials and supplies |  | 609 |  |  | 426 |
|  | $ | 894 |  |  | $ | 689 |
The Company recorded a write-down of its product inventory of $33 million from cost to net realizable value as at December 31, 2017 (2016 - $73 million).

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- Definition The entire disclosure for inventories. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 2 -IssueDate 2017-01-01 -Section Disclosure -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=2&date=2017-03-01&anchor=sect_Disclosure&doctype=Standard -URIDate 2017-03-09 + Details
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