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Description of Business and Segmented Disclosures - Schedule of Assets by Segment (Detail) - CAD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Disclosure Of Reportable Segments [Line Items] |  |  |
E&E Assets | $ 623 | $ 787 |
PP&E | 25,411 | 27,834 | $ 28,698
ROU Assets | 1,139 | 1,325 | $ 893
Goodwill | 2,272 | 2,272 |
Total Assets | 32,770 | 35,713 |
Oil Sands [Member] |  |  |
Disclosure Of Reportable Segments [Line Items] |  |  |
E&E Assets | 617 | 594 |
PP&E | 19,748 | 20,924 |
ROU Assets | 623 | 768 |
Goodwill | 2,272 | 2,272 |
Total Assets | 24,656 | 26,203 |
Conventional [Member] |  |  |
Disclosure Of Reportable Segments [Line Items] |  |  |
E&E Assets | 6 | 193 |
PP&E | 1,758 | 2,433 |
ROU Assets | 3 | 3 |
Total Assets | 1,953 | 2,754 |
Refining and Marketing [Member] |  |  |
Disclosure Of Reportable Segments [Line Items] |  |  |
PP&E | 3,652 | 4,131 |
ROU Assets | 79 | 77 |
Total Assets | 4,951 | 5,688 |
Corporate and Eliminations [Member] |  |  |
Disclosure Of Reportable Segments [Line Items] |  |  |
PP&E | 253 | 346 |
ROU Assets | 434 | 477 |
Total Assets | $ 1,210 | $ 1,068 |

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