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Description of Business and Segmented Disclosures - Schedule of Capital Expenditures (Detail) - CAD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Disclosure Of Reportable Segments [Line Items] |  |  |  |
Capital Investment | $ 1,346 | $ 1,025 | $ 3,537 | $ 3,128
Acquisitions | 4 | 33 | 19 | 377
Total Capital Expenditures | 1,350 | 1,058 | 3,556 | 3,505
Upstream |  |  |  |
Disclosure Of Reportable Segments [Line Items] |  |  |  |
Capital Investment | 1,142 | 884 | 3,050 | 2,565
Downstream |  |  |  |
Disclosure Of Reportable Segments [Line Items] |  |  |  |
Capital Investment | 197 | 126 | 465 | 534
Oil Sands |  |  |  |
Disclosure Of Reportable Segments [Line Items] |  |  |  |
Acquisitions | 1 | 32 | 7 | 35
Oil Sands | Upstream |  |  |  |
Disclosure Of Reportable Segments [Line Items] |  |  |  |
Capital Investment | 681 | 590 | 1,941 | 1,764
Conventional |  |  |  |
Disclosure Of Reportable Segments [Line Items] |  |  |  |
Acquisitions | 3 | 1 | 12 | 5
Conventional | Upstream |  |  |  |
Disclosure Of Reportable Segments [Line Items] |  |  |  |
Capital Investment | 106 | 100 | 300 | 323
Offshore | Asia Pacific | Upstream |  |  |  |
Disclosure Of Reportable Segments [Line Items] |  |  |  |
Capital Investment | 14 | 3 | 44 | 4
Offshore | Atlantic Region | Upstream |  |  |  |
Disclosure Of Reportable Segments [Line Items] |  |  |  |
Capital Investment | 341 | 191 | 765 | 474
Corporate and Eliminations |  |  |  |
Disclosure Of Reportable Segments [Line Items] |  |  |  |
Capital Investment | 7 | 15 | 22 | 29
Canadian Refining | Downstream |  |  |  |
Disclosure Of Reportable Segments [Line Items] |  |  |  |
Capital Investment | 44 | 38 | 145 | 99
U.S Refining |  |  |  |
Disclosure Of Reportable Segments [Line Items] |  |  |  |
Acquisitions | 0 | 0 | 0 | 337
U.S Refining | Downstream |  |  |  |
Disclosure Of Reportable Segments [Line Items] |  |  |  |
Capital Investment | $ 153 | $ 88 | $ 320 | $ 435

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- Definition Additions other than through business combinations property plant and equipment and exploration and evaluation assets. + References No definition available. + Details
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