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Revenue - Summary of Revenue Disaggregated by Geographical Region (Detail) - CAD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Disclosure of geographical areas [line items]
Revenue	$ 12,564	$ 11,910
China [member]
Disclosure of geographical areas [line items]
Revenue	2,060	2,079
Japan [member]
Disclosure of geographical areas [line items]
Revenue	1,880	1,872
South Korea [member]
Disclosure of geographical areas [line items]
Revenue	1,515	1,352
India [member]
Disclosure of geographical areas [line items]
Revenue	981	761
Other Asian Countries [member]
Disclosure of geographical areas [line items]
Revenue	1,207	951
United States [member]
Disclosure of geographical areas [line items]
Revenue	1,609	1,357
Canada [member]
Disclosure of geographical areas [line items]
Revenue	932	920
Latin America [member]
Disclosure of geographical areas [line items]
Revenue	297	407
Germany [member]
Disclosure of geographical areas [line items]
Revenue	561	578
Finland [member]
Disclosure of geographical areas [line items]
Revenue	242	284
Netherlands [member]
Disclosure of geographical areas [line items]
Revenue	240	215
Other European Countries [member]
Disclosure of geographical areas [line items]
Revenue	$ 1,040	$ 1,134

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The income arising in the course of an entity's ordinary activities. Income is increases in economic benefits during the accounting period in the form of inflows or enhancements of assets or decreases of liabilities that result in an increase in equity, other than those relating to contributions from equity participants.

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