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Stock-Based Compensation Plans - Summary of Stock-Based Compensation (Detail) - CAD ($) $ in Millions | 3 Months Ended | 9 Months Ended
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Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |
Stock-Based Compensation Expense (Recovery) | $ 28 | $ (3) | $ 97 | $ (15)
Stock-Based Compensation Costs Capitalized | 2 | 1 | 5 | (4)
Total Stock-Based Compensation | 30 | (2) | 102 | (19)
Stock Options With Associated Net Settlement Rights |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |
Stock-Based Compensation Expense (Recovery) | 3 | 3 | 11 | 9
Cenovus Replacement Stock Options |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |
Stock-Based Compensation Expense (Recovery) | 3 | 0 | 17 | 0
Performance Share Units |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |
Stock-Based Compensation Expense (Recovery) | 9 | (2) | 30 | (9)
Restricted Share Units |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |
Stock-Based Compensation Expense (Recovery) | 11 | (3) | 28 | (8)
Deferred Share Units |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |
Stock-Based Compensation Expense (Recovery) | $ 2 | $ (1) | $ 11 | $ (7)

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table. + References No definition available. + Details
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- Definition The amount of expense from share-based payment transactions with employees. [Refer: Expense from share-based payment transactions] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2021-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_112_c&doctype=Standard -URIDate 2021-03-24 + Details
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