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Description of Business and Segmented Disclosures - Schedule of Assets by Segment (Detail) - CAD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure Of Reportable Segments [Line Items]      
E&E Assets $ 623 $ 787  
PP&E 25,411 27,834 $ 28,698
ROU Assets 1,139 1,325 $ 893
Goodwill 2,272 2,272  
Total Assets 32,770 35,713  
Oil Sands [Member]      
Disclosure Of Reportable Segments [Line Items]      
E&E Assets 617 594  
PP&E 19,748 20,924  
ROU Assets 623 768  
Goodwill 2,272 2,272  
Total Assets 24,656 26,203  
Conventional [Member]      
Disclosure Of Reportable Segments [Line Items]      
E&E Assets 6 193  
PP&E 1,758 2,433  
ROU Assets 3 3  
Total Assets 1,953 2,754  
Refining and Marketing [Member]      
Disclosure Of Reportable Segments [Line Items]      
PP&E 3,652 4,131  
ROU Assets 79 77  
Total Assets 4,951 5,688  
Corporate and Eliminations [Member]      
Disclosure Of Reportable Segments [Line Items]      
PP&E 253 346  
ROU Assets 434 477  
Total Assets $ 1,210 $ 1,068