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Segmented Information - Schedule of Major Customers (Detail) - CAD CAD in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Disclosure of major customers [line items] |  |
Revenue | CAD 12,048 | CAD 9,300
China [member] |  |
Disclosure of major customers [line items] |  |
Revenue | 2,129 | 1,773
Japan [member] |  |
Disclosure of major customers [line items] |  |
Revenue | 1,921 | 1,319
South Korea [member] |  |
Disclosure of major customers [line items] |  |
Revenue | 1,353 | 1,181
India [member] |  |
Disclosure of major customers [line items] |  |
Revenue | 763 | 553
Other Asian Countries [member] |  |
Disclosure of major customers [line items] |  |
Revenue | 970 | 825
United States [member] |  |
Disclosure of major customers [line items] |  |
Revenue | 1,360 | 1,314
Canada [member] |  |
Disclosure of major customers [line items] |  |
Revenue | 919 | 770
Latin America [member] |  |
Disclosure of major customers [line items] |  |
Revenue | 407 | 294
Germany [member] |  |
Disclosure of major customers [line items] |  |
Revenue | 579 | 354
Finland [member] |  |
Disclosure of major customers [line items] |  |
Revenue | 284 | 178
Spain [member] |  |
Disclosure of major customers [line items] |  |
Revenue | 278 | 186
Netherlands [member] |  |
Disclosure of major customers [line items] |  |
Revenue | 215 | 95
Italy [member] |  |
Disclosure of major customers [line items] |  |
Revenue | 191 | 124
Other European Countries [member] |  |
Disclosure of major customers [line items] |  |
Revenue | CAD 679 | CAD 334

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