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Description of Business and Segmented Disclosures - Schedule of Capital Expenditures (Detail) - CAD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Disclosure Of Reportable Segments [Line Items]        
Capital Investment $ 822 $ 534 $ 1,568 $ 1,081
Acquisition Capital 1 0 1 7
Acquisitions 0 0 0 13,341
Total Capital Expenditures 823 534 1,569 14,429
Upstream        
Disclosure Of Reportable Segments [Line Items]        
Capital Investment 500 264 1,016 574
Downstream        
Disclosure Of Reportable Segments [Line Items]        
Capital Investment 305 252 527 462
Oil Sands        
Disclosure Of Reportable Segments [Line Items]        
Acquisition Capital 0 0 0 3
Acquisitions 0 0 0 5,002
Oil Sands | Upstream        
Disclosure Of Reportable Segments [Line Items]        
Capital Investment 376 201 751 419
Conventional        
Disclosure Of Reportable Segments [Line Items]        
Acquisition Capital 1 0 1 4
Acquisitions 0 0 0 547
Conventional | Upstream        
Disclosure Of Reportable Segments [Line Items]        
Capital Investment 33 28 121 94
Offshore        
Disclosure Of Reportable Segments [Line Items]        
Acquisitions 0 0 0 3,045
Offshore | Asia Pacific | Upstream        
Disclosure Of Reportable Segments [Line Items]        
Capital Investment 2 1 2 3
Offshore | Atlantic Region | Upstream        
Disclosure Of Reportable Segments [Line Items]        
Capital Investment 89 34 142 58
Canadian Manufacturing        
Disclosure Of Reportable Segments [Line Items]        
Acquisitions 0 0 0 2,283
Canadian Manufacturing | Downstream        
Disclosure Of Reportable Segments [Line Items]        
Capital Investment 36 10 50 14
U.S. Manufacturing        
Disclosure Of Reportable Segments [Line Items]        
Acquisitions 0 0 0 1,618
U.S. Manufacturing | Downstream        
Disclosure Of Reportable Segments [Line Items]        
Capital Investment 267 237 474 442
Retail        
Disclosure Of Reportable Segments [Line Items]        
Acquisitions 0 0 0 690
Retail | Downstream        
Disclosure Of Reportable Segments [Line Items]        
Capital Investment 2 5 3 6
Corporate and Eliminations        
Disclosure Of Reportable Segments [Line Items]        
Capital Investment 17 18 25 45
Acquisitions $ 0 $ 0 $ 0 $ 156