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Description of Business and Segmented Disclosures - Schedule of Assets by Segment (Detail) - CAD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure Of Reportable Segments [Line Items]      
E&E Assets $ 685 $ 720  
PP&E 36,499 34,225 $ 25,411
ROU Assets 1,845 2,010 1,139
Goodwill 2,923 3,473 $ 2,272
Total Assets 55,869 54,104  
Total Current Assets 12,430 11,988  
Assets held for sale, included in total assets, divested 1,300    
Canada      
Disclosure Of Reportable Segments [Line Items]      
Assets held for sale, included in total assets, divested 1,300    
Oil Sands      
Disclosure Of Reportable Segments [Line Items]      
E&E Assets 674 653  
PP&E 24,657 22,535  
ROU Assets 638 754  
Goodwill 2,923 3,473  
Total Assets 32,248 31,070  
Conventional      
Disclosure Of Reportable Segments [Line Items]      
E&E Assets 6 6  
PP&E 2,020 2,174  
ROU Assets 2 2  
Goodwill 0 0  
Total Assets 2,410 3,026  
Offshore      
Disclosure Of Reportable Segments [Line Items]      
E&E Assets 5 61  
PP&E 2,549 2,822  
ROU Assets 152 160  
Goodwill 0 0  
Total Assets 3,339 3,597  
Canadian Manufacturing      
Disclosure Of Reportable Segments [Line Items]      
E&E Assets 0 0  
PP&E 2,466 2,558  
ROU Assets 252 388  
Goodwill 0 0  
Total Assets 3,172 3,884  
U.S. Manufacturing      
Disclosure Of Reportable Segments [Line Items]      
E&E Assets 0 0  
PP&E 4,482 3,745  
ROU Assets 329 252  
Goodwill 0 0  
Total Assets 8,324 7,509  
Corporate and Eliminations      
Disclosure Of Reportable Segments [Line Items]      
E&E Assets 0 0  
PP&E 325 391  
ROU Assets 472 454  
Goodwill 0 0  
Total Assets $ 6,376 $ 5,018