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Description of Business and Segmented Disclosures - Schedule of Assets by Segment (Detail) - CAD ($)
$ in Millions
Sep. 30, 2021
Dec. 31, 2020
Disclosure Of Reportable Segments [Line Items]    
E&E Assets $ 655 $ 623
PP&E 37,599 25,411
ROU Assets 2,133 1,139
Goodwill 2,984 2,272
Total Assets 54,251 32,770
Oil Sands    
Disclosure Of Reportable Segments [Line Items]    
E&E Assets 634 617
PP&E 23,632 19,748
ROU Assets 749 196
Goodwill 2,984 2,272
Total Assets 30,782 24,641
Conventional    
Disclosure Of Reportable Segments [Line Items]    
E&E Assets 6 6
PP&E 1,948 1,758
ROU Assets 4 3
Goodwill 0 0
Total Assets 2,706 1,978
Offshore    
Disclosure Of Reportable Segments [Line Items]    
E&E Assets 15 0
PP&E 2,795 0
ROU Assets 164 0
Goodwill 0 0
Total Assets 3,626 0
Canadian Manufacturing    
Disclosure Of Reportable Segments [Line Items]    
E&E Assets 0 0
PP&E 2,365 176
ROU Assets 366 392
Goodwill 0 0
Total Assets 3,006 578
U.S. Manufacturing    
Disclosure Of Reportable Segments [Line Items]    
E&E Assets 0 0
PP&E 6,053 3,476
ROU Assets 280 114
Goodwill 0 0
Total Assets 9,946 4,363
Retail    
Disclosure Of Reportable Segments [Line Items]    
E&E Assets 0 0
PP&E 422 0
ROU Assets 107 0
Goodwill 0 0
Total Assets 708 0
Corporate and Eliminations    
Disclosure Of Reportable Segments [Line Items]    
E&E Assets 0 0
PP&E 384 253
ROU Assets 463 434
Goodwill 0 0
Total Assets $ 3,477 $ 1,210