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Leases - Lease Assets by Segment (Details) - CAD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Jan. 01, 2019
Disclosure of operating segments [line items]      
Lease assets $ 1,645 $ 1,789 $ 1,539
Operating segments | North America      
Disclosure of operating segments [line items]      
Lease assets 345 300  
Operating segments | North Sea      
Disclosure of operating segments [line items]      
Lease assets 7 38  
Operating segments | Offshore Africa      
Disclosure of operating segments [line items]      
Lease assets 126 154  
Operating segments | Oil Sands Mining and Upgrading      
Disclosure of operating segments [line items]      
Lease assets 1,080 1,191  
Head office      
Disclosure of operating segments [line items]      
Lease assets $ 87 $ 106