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Leases - Schedule of Lease Assets (Details) - CAD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of operating segments [line items]      
Lease assets $ 1,394 $ 1,458 $ 1,447
Operating segments | North America      
Disclosure of operating segments [line items]      
Lease assets 257 280  
Operating segments | North Sea      
Disclosure of operating segments [line items]      
Lease assets 25 18  
Operating segments | Offshore Africa      
Disclosure of operating segments [line items]      
Lease assets 93 119  
Operating segments | Oil Sands Mining and Upgrading      
Disclosure of operating segments [line items]      
Lease assets 932 1,001  
Head Office      
Disclosure of operating segments [line items]      
Lease assets $ 87 $ 40