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Inventories - Summary of Inventories (Detail) - CAD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017	Jan. 01, 2017
Disclosure of inventories [abstract]
Supplies	$ 693	$ 563
Raw materials	300	223
Work in process	595	529
Finished products	539	462
Inventories	2,127	1,777
Less long-term portion (Note 14)	(62)	(108)
Inventories, total	$ 2,065	$ 1,669	$ 1,673

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A classification of current inventory representing the amount of goods that have completed the production process and are held for sale in the ordinary course of business. [Refer: Inventories]

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The amount of assets: (a) held for sale in the ordinary course of business; (b) in the process of production for such sale; or (c) in the form of materials or supplies to be consumed in the production process or in the rendering of services. Inventories encompass goods purchased and held for resale including, for example, merchandise purchased by a retailer and held for resale, or land and other property held for resale. Inventories also encompass finished goods produced, or work in progress being produced, by the entity and include materials and supplies awaiting use in the production process. [Refer: Current finished goods; Current merchandise; Current work in progress; Land]

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