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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, 2024
Dec. 31, 2023
Disclosure Of Exploration And Evaluation Assets [Line Items]    
Beginning Balance $ 738  
Write-downs (69) $ (42)
Ending Balance 484 738
E&E Asset    
Disclosure Of Exploration And Evaluation Assets [Line Items]    
Beginning Balance 738 685
Acquisition 7 31
Additions 65 84
Transfer to PP&E (Note 16) (285) (60)
Write-downs (37) (29)
Change in Decommissioning Liabilities (5) 28
Exchange Rate Movements and Other 1 (1)
Ending Balance $ 484 $ 738