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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, 2024 | Dec. 31, 2023
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Total stock-based compensation expense | $ 54 | $ 65
Stock options |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Total stock-based compensation expense | (58) | 24
Restricted share units |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Total stock-based compensation expense | 20 | 32
Deferred share units |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Total stock-based compensation expense | (10) | 2
Equity derivative effect, net of interest receipt |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Total stock-based compensation expense | $ 102 | $ 7

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