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STOCK-BASED COMPENSATION - Summary of Stock-based Compensation Expense (Details) - CAD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Total stock-based compensation expense | $ 67 | $ 60
Stock options |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Total stock-based compensation expense | 28 | 3
Restricted share units |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Total stock-based compensation expense | 51 | 57
Deferred share units |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Total stock-based compensation expense | 9 | 6
Equity derivative effect, net of interest receipt |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Total stock-based compensation expense | $ (21) | $ (6)

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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 2022-03-24 -Paragraph 112 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2022-en-r&anchor=para_112_c&doctype=Standard -URIDate 2022-03-24 + Details
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