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INVENTORY - Schedule of Inventory (Details) - CAD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
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Inventories [Abstract] |  |
Product inventory | $ 285 | $ 263
Materials and supplies | 609 | 426
Total inventory | $ 894 | $ 689

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- Definition A classification of current inventory representing the amount of unrefined, unprocessed oil. [Refer: Inventories] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 2 -IssueDate 2017-01-01 -Paragraph 37 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=2&date=2017-03-01&anchor=para_37&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition A classification of current inventory representing the amount of current raw materials and current production supplies. [Refer: Current production supplies; Current raw materials] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 2 -IssueDate 2017-01-01 -Paragraph 37 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=2&date=2017-03-01&anchor=para_37&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of current inventories. [Refer: Inventories] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 2 -IssueDate 2017-01-01 -Paragraph 36 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=2&date=2017-03-01&anchor=para_36_b&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 54 -Subparagraph g -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_54_g&doctype=Standard -URIDate 2017-03-09 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 68 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_68&doctype=Standard -URIDate 2017-03-09 + Details
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