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Description of Business and Segmented Disclosures - Schedule of Assets by Segment (Detail) - CAD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | --- | ---
Disclosure Of Reportable Segments [Line Items] |  |  |
E&E Assets | $ 685 | $ 720 |
PP&E | 36,499 | 34,225 | $ 25,411
ROU Assets | 1,845 | 2,010 | 1,139
Goodwill | 2,923 | 3,473 | $ 2,272
Total Assets | 55,869 | 54,104 |
Total Current Assets | 12,430 | 11,988 |
Assets held for sale, included in total assets, divested | 1,300 |  |
Canada |  |  |
Disclosure Of Reportable Segments [Line Items] |  |  |
Assets held for sale, included in total assets, divested | 1,300 |  |
Oil Sands |  |  |
Disclosure Of Reportable Segments [Line Items] |  |  |
E&E Assets | 674 | 653 |
PP&E | 24,657 | 22,535 |
ROU Assets | 638 | 754 |
Goodwill | 2,923 | 3,473 |
Total Assets | 32,248 | 31,070 |
Conventional |  |  |
Disclosure Of Reportable Segments [Line Items] |  |  |
E&E Assets | 6 | 6 |
PP&E | 2,020 | 2,174 |
ROU Assets | 2 | 2 |
Goodwill | 0 | 0 |
Total Assets | 2,410 | 3,026 |
Offshore |  |  |
Disclosure Of Reportable Segments [Line Items] |  |  |
E&E Assets | 5 | 61 |
PP&E | 2,549 | 2,822 |
ROU Assets | 152 | 160 |
Goodwill | 0 | 0 |
Total Assets | 3,339 | 3,597 |
Canadian Manufacturing |  |  |
Disclosure Of Reportable Segments [Line Items] |  |  |
E&E Assets | 0 | 0 |
PP&E | 2,466 | 2,558 |
ROU Assets | 252 | 388 |
Goodwill | 0 | 0 |
Total Assets | 3,172 | 3,884 |
U.S. Manufacturing |  |  |
Disclosure Of Reportable Segments [Line Items] |  |  |
E&E Assets | 0 | 0 |
PP&E | 4,482 | 3,745 |
ROU Assets | 329 | 252 |
Goodwill | 0 | 0 |
Total Assets | 8,324 | 7,509 |
Corporate and Eliminations |  |  |
Disclosure Of Reportable Segments [Line Items] |  |  |
E&E Assets | 0 | 0 |
PP&E | 325 | 391 |
ROU Assets | 472 | 454 |
Goodwill | 0 | 0 |
Total Assets | $ 6,376 | $ 5,018 |

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