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Inventory - Schedule of Inventory (Details) - CAD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Inventories [Abstract]
Product inventory	$ 390	$ 468
Materials and supplies	670	684
Total inventory	$ 1,060	$ 1,152

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- Definition

Inventories [Abstract]

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No definition available.

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- Definition

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

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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]

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The amount of current inventories. [Refer: Inventories]

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