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Exploration and Evaluation Assets, Net - Summary of Exploration and Valuation Assets, Net (Detail) - CAD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
 [1]
Jun. 30, 2022
Jun. 30, 2021
 [1]
Disclosure Of Exploration And Evaluation Assets [Line Items]        
Beginning Balance     $ 720  
Exploration Expense $ (10) $ (4) (26) $ (10)
Ending Balance 725   725  
E&E Assets        
Disclosure Of Exploration And Evaluation Assets [Line Items]        
Beginning Balance     720  
Additions     13  
Change in Decommissioning Liabilities     (12)  
Exchange Rate Movements and Other     4  
Ending Balance $ 725   $ 725  
[1] See Note 3 for revisions to prior period results.