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Description of Business and Segmented Disclosures - Schedule of Assets by Segment (Detail) - CAD ($)
$ in Millions
Sep. 30, 2023
Dec. 31, 2022
Disclosure Of Reportable Segments [Line Items]    
Intangible exploration and evaluation assets $ 796 $ 685
Property, plant and equipment 36,727 36,499
Right-of-use assets 1,738 1,845
Goodwill 2,923 2,923
Assets 54,427 55,869
Current assets 10,745 12,430
Oil Sands    
Disclosure Of Reportable Segments [Line Items]    
Intangible exploration and evaluation assets 785 674
Property, plant and equipment 24,271 24,657
Right-of-use assets 687 638
Goodwill 2,923 2,923
Assets 32,481 32,248
Conventional    
Disclosure Of Reportable Segments [Line Items]    
Intangible exploration and evaluation assets 5 6
Property, plant and equipment 2,045 2,020
Right-of-use assets 2 2
Goodwill 0 0
Assets 2,278 2,410
Offshore    
Disclosure Of Reportable Segments [Line Items]    
Intangible exploration and evaluation assets 6 5
Property, plant and equipment 2,679 2,549
Right-of-use assets 103 152
Goodwill 0 0
Assets 3,416 3,339
Canadian Manufacturing    
Disclosure Of Reportable Segments [Line Items]    
Intangible exploration and evaluation assets 0 0
Property, plant and equipment 2,438 2,466
Right-of-use assets 220 252
Goodwill 0 0
Assets 3,320 3,172
U.S. Manufacturing    
Disclosure Of Reportable Segments [Line Items]    
Intangible exploration and evaluation assets 0 0
Property, plant and equipment 4,981 4,482
Right-of-use assets 286 329
Goodwill 0 0
Assets 9,728 8,324
Corporate and Eliminations    
Disclosure Of Reportable Segments [Line Items]    
Intangible exploration and evaluation assets 0 0
Property, plant and equipment 313 325
Right-of-use assets 440 472
Goodwill 0 0
Assets $ 3,204 $ 6,376