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Description of Business and Segmented Disclosures - Schedule of Capital Expenditures (Detail) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Aug. 31, 2022
Disclosure Of Reportable Segments [Line Items]        
Capital Investment $ 3,708 $ 2,563 $ 841  
Acquisitions (Note 5) 1,621 13,432 18  
Total Capital Expenditures 5,329 15,995 859  
Sunrise Oil Sands Partnership        
Disclosure Of Reportable Segments [Line Items]        
Investment in Equity-Accounted Affiliates       $ 1,559
Upstream        
Disclosure Of Reportable Segments [Line Items]        
Capital Investment 2,446 1,416 505  
Upstream | Asia Pacific        
Disclosure Of Reportable Segments [Line Items]        
Capital Investment 8 21 0  
Upstream | Atlantic        
Disclosure Of Reportable Segments [Line Items]        
Capital Investment 302 154 0  
Downstream        
Disclosure Of Reportable Segments [Line Items]        
Capital Investment 1,176 1,063 276  
Oil Sands        
Disclosure Of Reportable Segments [Line Items]        
Acquisitions (Note 5) 1,609 5,005 6  
Oil Sands | Upstream        
Disclosure Of Reportable Segments [Line Items]        
Capital Investment 1,792 1,019 427  
Conventional        
Disclosure Of Reportable Segments [Line Items]        
Acquisitions (Note 5) 12 551 12  
Conventional | Upstream        
Disclosure Of Reportable Segments [Line Items]        
Capital Investment 344 222 78  
Offshore        
Disclosure Of Reportable Segments [Line Items]        
Acquisitions (Note 5) 0 3,129 0  
Canadian Manufacturing        
Disclosure Of Reportable Segments [Line Items]        
Acquisitions (Note 5) 0 2,973 0  
Canadian Manufacturing | Downstream        
Disclosure Of Reportable Segments [Line Items]        
Capital Investment 117 68 33  
U.S. Manufacturing        
Disclosure Of Reportable Segments [Line Items]        
Acquisitions (Note 5) 0 1,618 0  
U.S. Manufacturing | Downstream        
Disclosure Of Reportable Segments [Line Items]        
Capital Investment 1,059 995 243  
Corporate and Eliminations        
Disclosure Of Reportable Segments [Line Items]        
Capital Investment 86 84 60  
Acquisitions (Note 5) $ 0 $ 156 $ 0