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Segmented Information - Schedule of Geographical Areas (Detail) - CAD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Disclosure of geographical areas [line items]    
Geographical distribution of non-current assets $ 33,242 $ 31,075
Canada [member]    
Disclosure of geographical areas [line items]    
Geographical distribution of non-current assets 23,238 22,466
Chile [member]    
Disclosure of geographical areas [line items]    
Geographical distribution of non-current assets 7,146 6,077
Peru [member]    
Disclosure of geographical areas [line items]    
Geographical distribution of non-current assets 1,477 1,305
United States [member]    
Disclosure of geographical areas [line items]    
Geographical distribution of non-current assets 1,282 1,131
Other [member]    
Disclosure of geographical areas [line items]    
Geographical distribution of non-current assets $ 99 $ 96