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Exploration and Evaluation Assets, Net - Summary of Exploration and Valuation Assets, Net (Detail) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure Of Exploration And Evaluation Assets [Line Items]      
Beginning Balance $ 623    
Exploration Expense (18) $ (91) [1] $ (82) [1]
Ending Balance 720 623  
E&E Asset      
Disclosure Of Exploration And Evaluation Assets [Line Items]      
Beginning Balance 623 787  
Acquisitions (Note 5) 45    
Additions 55 48  
Transfers to PP&E (Note 18)   (47)  
Exploration Expense (9) (91)  
Depletion   (18)  
Change in Decommissioning Liabilities 6 5  
Divestitures (Note 9)   (61)  
Ending Balance $ 720 $ 623 $ 787
[1] See Note 3(w) for revisions to comparative results.