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Leases - Lease Assets by Segment (Details) - CAD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of operating segments [line items]      
Lease assets $ 1,508 $ 1,645 $ 1,789
Operating segments | North America      
Disclosure of operating segments [line items]      
Lease assets 308 345  
Operating segments | North Sea      
Disclosure of operating segments [line items]      
Lease assets 1 7  
Operating segments | Offshore Africa      
Disclosure of operating segments [line items]      
Lease assets 101 126  
Operating segments | Oil Sands Mining and Upgrading      
Disclosure of operating segments [line items]      
Lease assets 1,027 1,080  
Head office      
Disclosure of operating segments [line items]      
Lease assets $ 71 $ 87