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Revenue - Summary of Revenue Disaggregated by Geographical Region (Detail) - CAD ($) $ in Millions | 12 Months Ended
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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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