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Description of Business and Segmented Disclosures - Schedule of Capital Expenditures (Details) - CAD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Disclosure Of Reportable Segments [Line Items] |  |  |  |
Capital Investment | $ 1,154 | $ 1,346 | $ 3,547 | $ 3,537
Acquisitions | 7 | 4 | 268 | 19
Total Capital Expenditures | 1,161 | 1,350 | 3,815 | 3,556
Upstream |  |  |  |
Disclosure Of Reportable Segments [Line Items] |  |  |  |
Capital Investment | 999 | 1,142 | 3,112 | 3,050
Downstream |  |  |  |
Disclosure Of Reportable Segments [Line Items] |  |  |  |
Capital Investment | 153 | 197 | 426 | 465
Oil Sands |  |  |  |
Disclosure Of Reportable Segments [Line Items] |  |  |  |
Acquisitions | 7 | 1 | 235 | 7
Oil Sands | Upstream |  |  |  |
Disclosure Of Reportable Segments [Line Items] |  |  |  |
Capital Investment | 675 | 681 | 2,082 | 1,941
Conventional |  |  |  |
Disclosure Of Reportable Segments [Line Items] |  |  |  |
Acquisitions | 0 | 3 | 33 | 12
Conventional | Upstream |  |  |  |
Disclosure Of Reportable Segments [Line Items] |  |  |  |
Capital Investment | 107 | 106 | 302 | 300
Offshore | Atlantic Region | Upstream |  |  |  |
Disclosure Of Reportable Segments [Line Items] |  |  |  |
Capital Investment | 194 | 341 | 674 | 765
Offshore | Asia Pacific | Upstream |  |  |  |
Disclosure Of Reportable Segments [Line Items] |  |  |  |
Capital Investment | 23 | 14 | 54 | 44
Canadian Refining | Downstream |  |  |  |
Disclosure Of Reportable Segments [Line Items] |  |  |  |
Capital Investment | 33 | 44 | 83 | 145
U.S Refining | Downstream |  |  |  |
Disclosure Of Reportable Segments [Line Items] |  |  |  |
Capital Investment | 120 | 153 | 343 | 320
Corporate and Eliminations |  |  |  |
Disclosure Of Reportable Segments [Line Items] |  |  |  |
Capital Investment | $ 2 | $ 7 | $ 9 | $ 22

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