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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, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Disclosure Of Reportable Segments [Line Items] |  |  |  |
Capital Investment | $ 647 | $ 148 | $ 1,728 | $ 599
Acquisition Capital | 0 | 4 | 7 | 10
Total Capital Expenditures | 731 | 152 | 15,480 | 609
Oil Sands |  |  |  |
Disclosure Of Reportable Segments [Line Items] |  |  |  |
Capital Investment | 198 | 65 | 617 | 337
Acquisition Capital | 0 | 1 | 3 | 6
Acquisitions (Note 4) | 0 | 0 | 5,119 | 0
Conventional |  |  |  |
Disclosure Of Reportable Segments [Line Items] |  |  |  |
Capital Investment | 41 | 12 | 135 | 39
Acquisition Capital | 0 | 3 | 4 | 4
Acquisitions (Note 4) | 0 | 0 | 565 | 0
Offshore |  |  |  |
Disclosure Of Reportable Segments [Line Items] |  |  |  |
Capital Investment | 69 | 0 | 130 | 0
Acquisitions (Note 4) | 84 | 0 | 3,061 | 0
Canadian Manufacturing |  |  |  |
Disclosure Of Reportable Segments [Line Items] |  |  |  |
Capital Investment | 9 | 5 | 23 | 22
Acquisitions (Note 4) | 0 | 0 | 2,283 | 0
U.S. Manufacturing |  |  |  |
Disclosure Of Reportable Segments [Line Items] |  |  |  |
Capital Investment | 301 | 60 | 743 | 150
Acquisitions (Note 4) | 0 | 0 | 2,140 | 0
Retail |  |  |  |
Disclosure Of Reportable Segments [Line Items] |  |  |  |
Capital Investment | 16 | 0 | 22 | 0
Acquisitions (Note 4) | 0 | 0 | 422 | 0
Corporate and Eliminations |  |  |  |
Disclosure Of Reportable Segments [Line Items] |  |  |  |
Capital Investment | 13 | 6 | 58 | 51
Acquisitions (Note 4) | $ 0 | $ 0 | $ 155 | $ 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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- 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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- Definition The amount of additions to property, plant and equipment other than those acquired through business combinations. [Refer: Business combinations [member]; Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2021-01-01 -Paragraph 73 -Subparagraph e -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2021-en-r&anchor=para_73_e_i&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition The amount of additions to non-current assets other than financial instruments, deferred tax assets, net defined benefit assets and rights arising under insurance contracts. [Refer: Deferred tax assets; Financial instruments, class [member]; Non-current assets; Types of insurance contracts [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 8 -IssueDate 2021-01-01 -Paragraph 24 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2021-en-r&anchor=para_24_b&doctype=Standard -URIDate 2021-03-24 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 8 -IssueDate 2021-01-01 -Paragraph 28 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2021-en-r&anchor=para_28_e&doctype=Standard -URIDate 2021-03-24 + Details
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