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Stock-Based Compensation - Additional Information (Details) $ / shares in Units, number in Millions, $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2024 CAD ($) shares $ / shares | Dec. 31, 2023 CAD ($) shares $ / shares | Dec. 31, 2022 shares
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Option vesting period | 4 years |  |
Expiration period | 10 years |  |
Number of options granted (in shares) | 0 | 0 |
Executive stock option plan |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Number of shares reserved for issue under ESOP (in shares) | 73,600,000 |  |
Stock options |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Compensation expense related to stock options | $ | $ 0 | $ 2 |
Deferred share units plans under ESOP |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Vesting period | 3 years |  |
Number of common shares to be received on retirement or termination (in shares) | 1 |  |
Number of deferred share units outstanding allowing holders to receive common shares (in shares) | 149,000 | 143,000 |
Deferred share units plans |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Compensation expense related to stock options | $ | $ 10 | $ 9 |
Vesting period | 36 months |  |
Number of common shares to be received on retirement or termination (in shares) | 1,000,000 |  |
Number of deferred share units outstanding (in shares) | 149,000 | 143,000 |
Number of deferred share units granted (in shares) | 45,000 | 38,000 |
Number of deferred share units granted under ESOP (in shares) | 85,000 | 117,000 |
Number of deferred share units outstanding allowing holders to receive payment in cash (in shares) | 867,000 | 913,000 |
Number of deferred share units outstanding allowing holders to receive payment in cash or common shares, at the option of the holder (in shares) | 1,034,000 | 907,000 |
Carrying and fair value of the DSUs liability | $ | $ 84 | $ 62 |
Deferred share units plans | Board of director |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Number of deferred share units issued (in shares) | 193,000 | 206,000 |
Issued deferred share units price per share (in dollars per share) | $ / shares | $ 44.16 | $ 29.28 |
Number of deferred share units outstanding allowing holders to receive common shares (in shares) | 2,050,000 | 1,963,000 | 2,373,000
Deferred share units plans | Defer Receipt Of All Or Part Of Annual Bonus |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Number of deferred share units granted (in shares) | 44,000 | 33,000 |
Deferred share units plans | Defer Payment Of All Or Part Of RSUs |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Number of deferred share units granted (in shares) | 19,000 | 18,000 |
Restricted share units |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Compensation expense related to stock options | $ | $ 215 | $ 207 |
Vesting period | 36 months |  |
Number of deferred share units granted (in shares) | 6,700,000 | 8,500,000 |
Fair value of the RSUs and PSUs granted (in dollars per share) | $ / shares | $ 44.16 | $ 29.28 |
Performance share units (PSUs) |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Compensation expense related to stock options | $ | $ 96 | $ 45 |
Vesting period | 36 months |  |
Number of deferred share units granted (in shares) | 1,500,000 | 1,600,000 |
Restricted share units and performance share units |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Carrying and fair value of the DSUs liability | $ | $ 910 | $ 514 |

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