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STOCK OPTION AND STOCK UNIT PLANS - Narrative (Details) shares in Millions, $ in Millions | 12 Months Ended
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Dec. 31, 2024 CAD ($) compensationPlan shares | Dec. 31, 2023 CAD ($) shares | Dec. 31, 2022 CAD ($) shares
STOCK-BASED COMPENSATION |  |  |
Number of long-term incentive compensation plans | compensationPlan | 3 |  |
Compensation expense | $ 186 | $ 154 | $ 260
Common stock, shares authorized | shares | 181 | 181 | 181
Incentive Stock Options |  |  |
STOCK-BASED COMPENSATION |  |  |
Compensation expense | $ 19 | $ 18 | $ 15
Vesting period (in years) | 4 years |  |
Expiration term (in years) | 10 years |  |
Unrecognized compensation cost related to non-vested share-based compensation arrangements granted | $ 12 |  |
Weighted average period over which compensation cost is expected to be recognized (in years) | 2 years |  |
Performance Stock Units (PSUs) |  |  |
STOCK-BASED COMPENSATION |  |  |
Compensation expense | $ 75 | $ 59 | $ 169
Vesting period (in years) | 3 years |  |
Weighted average period over which compensation cost is expected to be recognized (in years) | 2 years |  |
Period prior to the maturity of the grant for which weighted average share price is used to calculate cash awards (in days) | 20 days |  |
Performance multiplier | 1.38 | 1.1 | 1.0
Unrecognized compensation expense related to non-vested units granted | $ 109 |  |
Performance Stock Units (PSUs) | Minimum |  |  |
STOCK-BASED COMPENSATION |  |  |
Performance multiplier | 0 |  |
Performance Stock Units (PSUs) | Maximum |  |  |
STOCK-BASED COMPENSATION |  |  |
Performance multiplier | 2.0 |  |
Restricted Stock Units (RSU) |  |  |
STOCK-BASED COMPENSATION |  |  |
Compensation expense | $ 92 | $ 77 | $ 76
Vesting period (in years) | 3 years |  |
Weighted average period over which compensation cost is expected to be recognized (in years) | 1 year |  |
Period prior to the maturity of the grant for which weighted average share price is used to calculate cash awards (in days) | 20 days |  |
Unrecognized compensation expense related to non-vested units granted | $ 67 |  |

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