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Other Operating Income (Expense) - Schedule of Other Operating Income (Expense) (Detail) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Disclosure of detailed information about financial instruments [line items] |  |
Settlement pricing adjustments (Note 30(b)) | $ 109 | $ (32)
Share-based compensation | (47) | (4)
Environmental costs and remeasurement of decommissioning and restoration provisions for closed operations | (270) | (197)
Care and maintenance costs | (52) | (36)
Social responsibility and donations | (23) | (18)
Gain (loss) on sale of assets | 34 | (20)
Take or pay contract costs | (104) | (123)
COVID-19 costs (Note 4(c)) | (282) | 0
Other | (90) | (75)
Other operating income (expense) | (725) | (505)
Sale and Purchase Contracts |  |
Disclosure of detailed information about financial instruments [line items] |  |
Settlement pricing adjustments (Note 30(b)) | 47 | (49)
Commodity Derivatives Excluding Sales and Purchase Contracts |  |
Disclosure of detailed information about financial instruments [line items] |  |
Settlement pricing adjustments (Note 30(b)) | $ 62 | $ 17

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- Definition The amount of expense arising from donations and subsidies. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_112_c&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The gain (loss) recognised on the measurement to fair value less costs to sell or on the disposal of the assets or disposal group(s) constituting the discontinued operation. [Refer: Discontinued operations [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 5 -IssueDate 2020-01-01 -Paragraph 33 -Subparagraph b -Clause iii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=5&code=ifrs-tx-2020-en-r&anchor=para_33_b_iii&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The gains (losses) on disposals of non-current assets. [Refer: Non-current assets] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_112_c&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The amount of miscellaneous other operating expenses. [Refer: Other operating income (expense)] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_112_c&doctype=Standard -URIDate 2020-01-01 + Details
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