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Description of Business and Segmented Disclosures - Schedule of Capital Expenditures (Detail) - CAD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure Of Reportable Segments [Line Items] |  |  |
Capital Investment | $ 841 | $ 1,176 | $ 1,363
Total Capital Expenditures | 859 | 1,189 | 1,704
Oil Sands [Member] |  |  |
Disclosure Of Reportable Segments [Line Items] |  |  |
Capital Investment | 427 | 656 | 870
Acquisition Capital | 6 | 2 | 319
Conventional [Member] |  |  |
Disclosure Of Reportable Segments [Line Items] |  |  |
Capital Investment | 78 | 103 | 228
Acquisition Capital | 12 | 7 | 22
Refining and Marketing [Member] |  |  |
Disclosure Of Reportable Segments [Line Items] |  |  |
Capital Investment | 276 | 280 | 208
Acquisition Capital |  | 4 |
Corporate and Eliminations [Member] |  |  |
Disclosure Of Reportable Segments [Line Items] |  |  |
Capital Investment | $ 60 | $ 137 | $ 57

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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 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 Disclosure of reportable segments. + 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 2020-01-01 -Paragraph 73 -Subparagraph e -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2020-en-r&anchor=para_73_e_i&doctype=Standard -URIDate 2020-01-01 + 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 2020-01-01 -Paragraph 24 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2020-en-r&anchor=para_24_b&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 8 -IssueDate 2020-01-01 -Paragraph 28 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2020-en-r&anchor=para_28_e&doctype=Standard -URIDate 2020-01-01 + Details
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- Details
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