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Inventories - Additional Information (Detail) - CAD CAD in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Disclosure of inventories [abstract]
Cost of sales	CAD 7,419	CAD 6,904
inventories recognized as expense	6,700	6,300
Net realizable value of inventories	17	53
Inventory write downs	20	7
Reversal of inventory write-downs	CAD 30	CAD 23

X

- Definition

The amount of inventories recognised as an expense during the period. [Refer: Inventories]

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- Definition

The amount of costs relating to expenses directly or indirectly attributed to the goods or services sold, which may include, but are not limited to, costs previously included in the measurement of inventory that has now been sold, unallocated production overheads and abnormal amounts of production costs of inventories.

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- Definition

The amount of inventories carried at net realisable value. [Refer: Inventories]

+ References

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- Definition

The amount of expense recognised related to the write-down of inventories to net realisable value. [Refer: Inventories]

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- Definition

The amount recognised as a reduction in the amount of inventories recognised as an expense due to the reversal of any write-down of inventories resulting from an increase in net realisable value. [Refer: Inventories; Inventory write-down]

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