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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, 2023 | Dec. 31, 2022
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Total stock-based compensation expense | $ 65 | $ 67
Stock options |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Total stock-based compensation expense | 24 | 28
Restricted share units |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Total stock-based compensation expense | 32 | 51
Deferred share units |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Total stock-based compensation expense | 2 | 9
Equity derivative effect, net of interest receipt |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Total stock-based compensation expense | $ 7 | $ (21)

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