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Description of Business and Segmented Disclosures - Schedule of Capital Expenditures (Detail) - CAD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Aug. 31, 2022
Disclosure Of Reportable Segments [Line Items] |  |  |  |
Capital Investment | $ 3,708 | $ 2,563 | $ 841 |
Acquisitions (Note 5) | 1,621 | 13,432 | 18 |
Total Capital Expenditures | 5,329 | 15,995 | 859 |
Sunrise Oil Sands Partnership |  |  |  |
Disclosure Of Reportable Segments [Line Items] |  |  |  |
Investment in Equity-Accounted Affiliates |  |  |  | $ 1,559
Upstream |  |  |  |
Disclosure Of Reportable Segments [Line Items] |  |  |  |
Capital Investment | 2,446 | 1,416 | 505 |
Upstream | Asia Pacific |  |  |  |
Disclosure Of Reportable Segments [Line Items] |  |  |  |
Capital Investment | 8 | 21 | 0 |
Upstream | Atlantic |  |  |  |
Disclosure Of Reportable Segments [Line Items] |  |  |  |
Capital Investment | 302 | 154 | 0 |
Downstream |  |  |  |
Disclosure Of Reportable Segments [Line Items] |  |  |  |
Capital Investment | 1,176 | 1,063 | 276 |
Oil Sands |  |  |  |
Disclosure Of Reportable Segments [Line Items] |  |  |  |
Acquisitions (Note 5) | 1,609 | 5,005 | 6 |
Oil Sands | Upstream |  |  |  |
Disclosure Of Reportable Segments [Line Items] |  |  |  |
Capital Investment | 1,792 | 1,019 | 427 |
Conventional |  |  |  |
Disclosure Of Reportable Segments [Line Items] |  |  |  |
Acquisitions (Note 5) | 12 | 551 | 12 |
Conventional | Upstream |  |  |  |
Disclosure Of Reportable Segments [Line Items] |  |  |  |
Capital Investment | 344 | 222 | 78 |
Offshore |  |  |  |
Disclosure Of Reportable Segments [Line Items] |  |  |  |
Acquisitions (Note 5) | 0 | 3,129 | 0 |
Canadian Manufacturing |  |  |  |
Disclosure Of Reportable Segments [Line Items] |  |  |  |
Acquisitions (Note 5) | 0 | 2,973 | 0 |
Canadian Manufacturing | Downstream |  |  |  |
Disclosure Of Reportable Segments [Line Items] |  |  |  |
Capital Investment | 117 | 68 | 33 |
U.S. Manufacturing |  |  |  |
Disclosure Of Reportable Segments [Line Items] |  |  |  |
Acquisitions (Note 5) | 0 | 1,618 | 0 |
U.S. Manufacturing | Downstream |  |  |  |
Disclosure Of Reportable Segments [Line Items] |  |  |  |
Capital Investment | 1,059 | 995 | 243 |
Corporate and Eliminations |  |  |  |
Disclosure Of Reportable Segments [Line Items] |  |  |  |
Capital Investment | 86 | 84 | 60 |
Acquisitions (Note 5) | $ 0 | $ 156 | $ 0 |

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