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Description of Business and Segmented Disclosures - Schedule of Capital Expenditures (Detail) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Disclosure Of Reportable Segments [Line Items] |  |  |
Capital Investment | $ 2,563 | $ 841 | $ 1,176
Acquisition Capital | 7 | 18 | 13
Acquisitions (Note 5) | 13,425 | 0 | 0
Total Capital Expenditures | 15,995 | 859 | 1,189
Upstream |  |  |
Disclosure Of Reportable Segments [Line Items] |  |  |
Capital Investment | 1,416 | 505 | 759
Upstream | Asia Pacific |  |  |
Disclosure Of Reportable Segments [Line Items] |  |  |
Capital Investment | 21 | 0 | 0
Upstream | Atlantic |  |  |
Disclosure Of Reportable Segments [Line Items] |  |  |
Capital Investment | 154 | 0 | 0
Downstream |  |  |
Disclosure Of Reportable Segments [Line Items] |  |  |
Capital Investment | 1,063 | 276 | 280
Oil Sands |  |  |
Disclosure Of Reportable Segments [Line Items] |  |  |
Acquisition Capital | 3 | 6 | 2
Acquisitions (Note 5) | 5,002 | 0 | 0
Oil Sands | Upstream |  |  |
Disclosure Of Reportable Segments [Line Items] |  |  |
Capital Investment | 1,019 | 427 | 656
Conventional |  |  |
Disclosure Of Reportable Segments [Line Items] |  |  |
Acquisition Capital | 4 | 12 | 7
Acquisitions (Note 5) | 547 | 0 | 0
Conventional | Upstream |  |  |
Disclosure Of Reportable Segments [Line Items] |  |  |
Capital Investment | 222 | 78 | 103
Offshore |  |  |
Disclosure Of Reportable Segments [Line Items] |  |  |
Acquisitions (Note 5) | 3,129 | 0 | 0
Canadian Manufacturing |  |  |
Disclosure Of Reportable Segments [Line Items] |  |  |
Capital Investment | 37 | 33 | 52
Acquisition Capital | 0 | 0 | 4
Acquisitions (Note 5) | 2,283 | 0 | 0
U.S. Manufacturing |  |  |
Disclosure Of Reportable Segments [Line Items] |  |  |
Capital Investment | 995 | 243 | 228
Acquisitions (Note 5) | 1,618 | 0 | 0
Retail |  |  |
Disclosure Of Reportable Segments [Line Items] |  |  |
Capital Investment | 31 | 0 | 0
Acquisitions (Note 5) | 690 | 0 | 0
Corporate and Eliminations |  |  |
Disclosure Of Reportable Segments [Line Items] |  |  |
Capital Investment | 84 | 60 | 137
Acquisitions (Note 5) | $ 156 | $ 0 | $ 0

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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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