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Description of Business and Segmented Disclosures - Schedule of Capital Expenditures (Detail) - CAD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Disclosure Of Reportable Segments [Line Items] |  |  |  |
Capital Investment | $ 822 | $ 534 | $ 1,568 | $ 1,081
Acquisition Capital | 1 | 0 | 1 | 7
Acquisitions | 0 | 0 | 0 | 13,341
Total Capital Expenditures | 823 | 534 | 1,569 | 14,429
Upstream |  |  |  |
Disclosure Of Reportable Segments [Line Items] |  |  |  |
Capital Investment | 500 | 264 | 1,016 | 574
Downstream |  |  |  |
Disclosure Of Reportable Segments [Line Items] |  |  |  |
Capital Investment | 305 | 252 | 527 | 462
Oil Sands |  |  |  |
Disclosure Of Reportable Segments [Line Items] |  |  |  |
Acquisition Capital | 0 | 0 | 0 | 3
Acquisitions | 0 | 0 | 0 | 5,002
Oil Sands | Upstream |  |  |  |
Disclosure Of Reportable Segments [Line Items] |  |  |  |
Capital Investment | 376 | 201 | 751 | 419
Conventional |  |  |  |
Disclosure Of Reportable Segments [Line Items] |  |  |  |
Acquisition Capital | 1 | 0 | 1 | 4
Acquisitions | 0 | 0 | 0 | 547
Conventional | Upstream |  |  |  |
Disclosure Of Reportable Segments [Line Items] |  |  |  |
Capital Investment | 33 | 28 | 121 | 94
Offshore |  |  |  |
Disclosure Of Reportable Segments [Line Items] |  |  |  |
Acquisitions | 0 | 0 | 0 | 3,045
Offshore | Asia Pacific | Upstream |  |  |  |
Disclosure Of Reportable Segments [Line Items] |  |  |  |
Capital Investment | 2 | 1 | 2 | 3
Offshore | Atlantic Region | Upstream |  |  |  |
Disclosure Of Reportable Segments [Line Items] |  |  |  |
Capital Investment | 89 | 34 | 142 | 58
Canadian Manufacturing |  |  |  |
Disclosure Of Reportable Segments [Line Items] |  |  |  |
Acquisitions | 0 | 0 | 0 | 2,283
Canadian Manufacturing | Downstream |  |  |  |
Disclosure Of Reportable Segments [Line Items] |  |  |  |
Capital Investment | 36 | 10 | 50 | 14
U.S. Manufacturing |  |  |  |
Disclosure Of Reportable Segments [Line Items] |  |  |  |
Acquisitions | 0 | 0 | 0 | 1,618
U.S. Manufacturing | Downstream |  |  |  |
Disclosure Of Reportable Segments [Line Items] |  |  |  |
Capital Investment | 267 | 237 | 474 | 442
Retail |  |  |  |
Disclosure Of Reportable Segments [Line Items] |  |  |  |
Acquisitions | 0 | 0 | 0 | 690
Retail | Downstream |  |  |  |
Disclosure Of Reportable Segments [Line Items] |  |  |  |
Capital Investment | 2 | 5 | 3 | 6
Corporate and Eliminations |  |  |  |
Disclosure Of Reportable Segments [Line Items] |  |  |  |
Capital Investment | 17 | 18 | 25 | 45
Acquisitions | $ 0 | $ 0 | $ 0 | $ 156

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- Definition Acquisitions other than through business combinations property plant and equipment and exploration and evaluation assets. + References No definition available. + Details
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- Definition Acquisitions Through Business Combinations Property Plant And Equipment And Exploration And Evaluation Assets + References No definition available. + Details
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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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