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Impairment Charges and Reversals - Summary of Impairment Losses and Estimated Recoverable Amounts (Detail) $ in Millions | 12 Months Ended
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Dec. 31, 2020 CAD ($)
Clearwater [Member] |
Disclosure Of Information For Each Material Impairment Loss Recognised Or Reversed For Individual Asset Or Cashgenerating Unit [Line Items] |
Impairment amount | $ 260
Recoverable amount | 160
Elmworth-Wapiti [Member] |
Disclosure Of Information For Each Material Impairment Loss Recognised Or Reversed For Individual Asset Or Cashgenerating Unit [Line Items] |
Impairment amount | 120
Recoverable amount | 259
Kaybob-Edson [Member] |
Disclosure Of Information For Each Material Impairment Loss Recognised Or Reversed For Individual Asset Or Cashgenerating Unit [Line Items] |
Impairment amount | 175
Recoverable amount | $ 384

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- Definition The amount of impairment loss recognised in profit or loss. [Refer: Impairment loss; Profit (loss)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2020-01-01 -Paragraph 126 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=36&code=ifrs-tx-2020-en-r&anchor=para_126_a&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2020-01-01 -Paragraph 129 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=36&code=ifrs-tx-2020-en-r&anchor=para_129_a&doctype=Standard -URIDate 2020-01-01 + Details
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