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Provisions and Other Liabilities - Summary of Provisions and Other Liabilities (Detail) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Jan. 01, 2017
Disclosure of other provisions [abstract]      
Provisions $ 1,653 $ 1,905  
Derivative liabilities (net of current portion of $6 (2017 - $nil)) 39 43  
IMSA payable 58    
Other 42 29  
Other liabilities and provisions $ 1,792 $ 1,977 $ 1,322