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Description of Business and Segmented Disclosures - Schedule of Assets by Segment (Detail) - CAD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure Of Reportable Segments [Line Items]      
E&E Assets $ 720 $ 623  
PP&E 34,225 25,411 $ 27,834
ROU Assets 2,010 1,139 1,325
Goodwill 3,473 2,272 $ 2,272
Total Assets 54,104 32,770  
Oil Sands      
Disclosure Of Reportable Segments [Line Items]      
E&E Assets 653 617  
PP&E 22,535 19,748  
ROU Assets 754 196  
Goodwill 3,473 2,272  
Total Assets 31,070 24,641  
Conventional      
Disclosure Of Reportable Segments [Line Items]      
E&E Assets 6 6  
PP&E 2,174 1,758  
ROU Assets 2 3  
Goodwill 0 0  
Total Assets 3,026 1,978  
Offshore      
Disclosure Of Reportable Segments [Line Items]      
E&E Assets 61 0  
PP&E 2,822 0  
ROU Assets 160 0  
Goodwill 0 0  
Total Assets 3,597 0  
Canadian Manufacturing      
Disclosure Of Reportable Segments [Line Items]      
E&E Assets 0 0  
PP&E 2,353 176  
ROU Assets 339 392  
Goodwill 0 0  
Total Assets 2,918 578  
U.S. Manufacturing      
Disclosure Of Reportable Segments [Line Items]      
E&E Assets 0 0  
PP&E 3,745 3,476  
ROU Assets 252 114  
Goodwill 0 0  
Total Assets 7,777 4,363  
Retail      
Disclosure Of Reportable Segments [Line Items]      
E&E Assets 0 0  
PP&E 205 0  
ROU Assets 49 0  
Goodwill 0 0  
Total Assets 966 0  
Corporate and Eliminations      
Disclosure Of Reportable Segments [Line Items]      
E&E Assets 0 0  
PP&E 391 253  
ROU Assets 454 434  
Goodwill 0 0  
Total Assets $ 4,750 $ 1,210