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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