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Description of Business and Segmented Disclosures - Schedule of Assets by Segment (Detail) - CAD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Disclosure Of Reportable Segments [Line Items] |  |  |
E&E Assets | $ 720 | $ 623 |
PP&E | 34,225 | 25,411 | $ 27,834
ROU Assets | 2,010 | 1,139 | 1,325
Goodwill | 3,473 | 2,272 | $ 2,272
Total Assets | 54,104 | 32,770 |
Oil Sands |  |  |
Disclosure Of Reportable Segments [Line Items] |  |  |
E&E Assets | 653 | 617 |
PP&E | 22,535 | 19,748 |
ROU Assets | 754 | 196 |
Goodwill | 3,473 | 2,272 |
Total Assets | 31,070 | 24,641 |
Conventional |  |  |
Disclosure Of Reportable Segments [Line Items] |  |  |
E&E Assets | 6 | 6 |
PP&E | 2,174 | 1,758 |
ROU Assets | 2 | 3 |
Goodwill | 0 | 0 |
Total Assets | 3,026 | 1,978 |
Offshore |  |  |
Disclosure Of Reportable Segments [Line Items] |  |  |
E&E Assets | 61 | 0 |
PP&E | 2,822 | 0 |
ROU Assets | 160 | 0 |
Goodwill | 0 | 0 |
Total Assets | 3,597 | 0 |
Canadian Manufacturing |  |  |
Disclosure Of Reportable Segments [Line Items] |  |  |
E&E Assets | 0 | 0 |
PP&E | 2,353 | 176 |
ROU Assets | 339 | 392 |
Goodwill | 0 | 0 |
Total Assets | 2,918 | 578 |
U.S. Manufacturing |  |  |
Disclosure Of Reportable Segments [Line Items] |  |  |
E&E Assets | 0 | 0 |
PP&E | 3,745 | 3,476 |
ROU Assets | 252 | 114 |
Goodwill | 0 | 0 |
Total Assets | 7,777 | 4,363 |
Retail |  |  |
Disclosure Of Reportable Segments [Line Items] |  |  |
E&E Assets | 0 | 0 |
PP&E | 205 | 0 |
ROU Assets | 49 | 0 |
Goodwill | 0 | 0 |
Total Assets | 966 | 0 |
Corporate and Eliminations |  |  |
Disclosure Of Reportable Segments [Line Items] |  |  |
E&E Assets | 0 | 0 |
PP&E | 391 | 253 |
ROU Assets | 454 | 434 |
Goodwill | 0 | 0 |
Total Assets | $ 4,750 | $ 1,210 |

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