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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

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