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

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Inventories [Abstract]

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A classification of current inventory representing the amount of unrefined, unprocessed oil. [Refer: Inventories]

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A classification of current inventory representing the amount of current raw materials and current production supplies. [Refer: Current production supplies; Current raw materials]

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The amount of current inventories. [Refer: Inventories]

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