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