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Leases - Lease Assets by Segment (Details) - CAD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure of operating segments [line items]      
Lease assets $ 1,447 $ 1,508 $ 1,645
Operating segments | North America      
Disclosure of operating segments [line items]      
Lease assets 277 308  
Operating segments | North Sea      
Disclosure of operating segments [line items]      
Lease assets 1 1  
Operating segments | Offshore Africa      
Disclosure of operating segments [line items]      
Lease assets 98 101  
Operating segments | Oil Sands Mining and Upgrading      
Disclosure of operating segments [line items]      
Lease assets 1,015 1,027  
Head Office      
Disclosure of operating segments [line items]      
Lease assets $ 56 $ 71