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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, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Disclosure Of Reportable Segments [Line Items] |  |  |  |
Capital Investment | $ 1,025 | $ 866 | $ 3,128 | $ 2,434
Acquisitions | 33 | 1,601 | 377 | 1,602
Total Capital Expenditures | 1,058 | 2,467 | 3,505 | 4,036
BP Products North America, Toledo |  |  |  |
Disclosure Of Reportable Segments [Line Items] |  |  |  |
Fair Value of Pre-Existing 50 Percent Ownership Interest in Toledo | 320 |  | 320 |
Fair Value of Pre-Existing 50 Percent Ownership Interest in Toledo | 320 |  | 320 |
Upstream |  |  |  |
Disclosure Of Reportable Segments [Line Items] |  |  |  |
Capital Investment | 884 | 508 | 2,565 | 1,524
Downstream |  |  |  |
Disclosure Of Reportable Segments [Line Items] |  |  |  |
Capital Investment | 126 | 324 | 534 | 851
Oil Sands |  |  |  |
Disclosure Of Reportable Segments [Line Items] |  |  |  |
Acquisitions (Note 3) | 32 | 1,596 | 35 | 1,596
Oil Sands | Upstream |  |  |  |
Disclosure Of Reportable Segments [Line Items] |  |  |  |
Capital Investment | 590 | 360 | 1,764 | 1,111
Conventional |  |  |  |
Disclosure Of Reportable Segments [Line Items] |  |  |  |
Acquisitions (Note 3) | 1 | 5 | 5 | 6
Conventional | Upstream |  |  |  |
Disclosure Of Reportable Segments [Line Items] |  |  |  |
Capital Investment | 100 | 67 | 323 | 188
Offshore | Asia Pacific | Upstream |  |  |  |
Disclosure Of Reportable Segments [Line Items] |  |  |  |
Capital Investment | 3 | 3 | 4 | 5
Offshore | Atlantic Region | Upstream |  |  |  |
Disclosure Of Reportable Segments [Line Items] |  |  |  |
Capital Investment | 191 | 78 | 474 | 220
Canadian Manufacturing | Downstream |  |  |  |
Disclosure Of Reportable Segments [Line Items] |  |  |  |
Capital Investment | 38 | 24 | 99 | 77
U.S. Manufacturing |  |  |  |
Disclosure Of Reportable Segments [Line Items] |  |  |  |
Acquisitions (Note 3) | 0 | 0 | 337 | 0
U.S. Manufacturing | Downstream |  |  |  |
Disclosure Of Reportable Segments [Line Items] |  |  |  |
Capital Investment | 88 | 300 | 435 | 774
Corporate and Eliminations |  |  |  |
Disclosure Of Reportable Segments [Line Items] |  |  |  |
Capital Investment | $ 15 | $ 34 | $ 29 | $ 59

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