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Stock-Based Compensation Plans - Summary of Stock-Based Compensation (Detail) - CAD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |
Stock-Based Compensation Expense (Recovery) | $ 87 | $ 34 | $ 194 | $ 69
Stock-Based Compensation Costs Capitalized | 0 | 2 | 0 | 3
Total Stock-Based Compensation | 87 | 36 | 194 | 72
Stock Options With Associated Net Settlement Rights |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |
Stock-Based Compensation Expense (Recovery) | 5 | 3 | 9 | 8
Cenovus Replacement Stock Options |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |
Stock-Based Compensation Expense (Recovery) | 22 | 7 | 41 | 14
Performance Share Units |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |
Stock-Based Compensation Expense (Recovery) | 28 | 9 | 65 | 21
Restricted Share Units |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |
Stock-Based Compensation Expense (Recovery) | 24 | 11 | 61 | 17
Deferred Share Units |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |
Stock-Based Compensation Expense (Recovery) | $ 8 | $ 4 | $ 18 | $ 9

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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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