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Other (Income) Loss, Net - Additional Information (Detail) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure Other Income And Expense [Line Items]      
Other (Income) Loss, Net $ 40 $ 9 $ 13
Lease income 24 $ 17  
Keystone XL Pipeline Project [Member]      
Disclosure Other Income And Expense [Line Items]      
Other (Income) Loss, Net 100    
CEWS Program [Member]      
Disclosure Other Income And Expense [Line Items]      
Other income $ 40