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Supplemental Cash Flow Information - Summary of Cash Flow Information (Detail) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Jan. 01, 2017
Dec. 31, 2016
Cash and cash equivalents        
Cash $ 438 $ 230    
Investments with maturities from the date of acquisition of three months or less 1,296 722    
Cash and cash equivalents 1,734 952 $ 1,407 $ 1,407
Net change in non-cashworking capital items        
Trade and settlements receivables 282 (44)    
Prepaids and other current assets (26) (145)    
Inventories (338) (27)    
Trade accounts payable and other liabilities 53 385    
Net change in non-cash working capital items $ (29) $ 169