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Employee Benefit Plans (Fair Value of Plan Assets) (Details) - CAD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | --- | ---
Defined benefit pension plans |  |  |
Classification of the methodology used by the Company to fair value its investments |  |  |
Fair Value of Plan Assets | $ 2,493 | $ 2,298 | $ 2,163
Total |  |  |
Classification of the methodology used by the Company to fair value its investments |  |  |
Fair Value of Plan Assets | $ 2,493 | $ 2,298 |
Percentage | 100.00% | 100.00% |
Total | Cash and cash equivalents |  |  |
Classification of the methodology used by the Company to fair value its investments |  |  |
Fair Value of Plan Assets | $ 39 | $ 40 |
Percentage | 2.00% | 2.00% |
Total | Net in-transits |  |  |
Classification of the methodology used by the Company to fair value its investments |  |  |
Fair Value of Plan Assets | $ (27) | $ (9) |
Percentage | (1.00%) | 0.00% |
Total | Canadian equity |  |  |
Classification of the methodology used by the Company to fair value its investments |  |  |
Fair Value of Plan Assets | $ 109 | $ 96 |
Percentage | 4.00% | 4.00% |
Total | US equity |  |  |
Classification of the methodology used by the Company to fair value its investments |  |  |
Fair Value of Plan Assets | $ 312 | $ 141 |
Percentage | 12.00% | 6.00% |
Total | Other equity |  |  |
Classification of the methodology used by the Company to fair value its investments |  |  |
Fair Value of Plan Assets | $ 140 | $ 112 |
Percentage | 5.00% | 5.00% |
Total | Government |  |  |
Classification of the methodology used by the Company to fair value its investments |  |  |
Fair Value of Plan Assets | $ 132 | $ 172 |
Percentage | 5.00% | 8.00% |
Total | Corporate |  |  |
Classification of the methodology used by the Company to fair value its investments |  |  |
Fair Value of Plan Assets | $ 92 | $ 90 |
Percentage | 4.00% | 4.00% |
Total | Other |  |  |
Classification of the methodology used by the Company to fair value its investments |  |  |
Fair Value of Plan Assets | $ 22 | $ 9 |
Percentage | 1.00% | 0.00% |
Total | Mutual funds |  |  |
Classification of the methodology used by the Company to fair value its investments |  |  |
Fair Value of Plan Assets | $ 13 | $ 50 |
Percentage | 1.00% | 2.00% |
Total | Other |  |  |
Classification of the methodology used by the Company to fair value its investments |  |  |
Fair Value of Plan Assets |  | $ 5 |
Percentage |  | 0.00% |
Total | Open-ended investments measured at NAV |  |  |
Classification of the methodology used by the Company to fair value its investments |  |  |
Fair Value of Plan Assets | $ 1,142 | $ 1,006 |
Percentage | 46.00% | 44.00% |
Total | Common collective trusts measured at NAV |  |  |
Classification of the methodology used by the Company to fair value its investments |  |  |
Fair Value of Plan Assets | $ 519 | $ 586 |
Percentage | 21.00% | 25.00% |
NAV |  |  |
Classification of the methodology used by the Company to fair value its investments |  |  |
Fair Value of Plan Assets | $ 1,661 | $ 1,592 |
NAV | Cash and cash equivalents |  |  |
Classification of the methodology used by the Company to fair value its investments |  |  |
Fair Value of Plan Assets | 0 | 0 |
NAV | Net in-transits |  |  |
Classification of the methodology used by the Company to fair value its investments |  |  |
Fair Value of Plan Assets | 0 | 0 |
NAV | Canadian equity |  |  |
Classification of the methodology used by the Company to fair value its investments |  |  |
Fair Value of Plan Assets | 0 | 0 |
NAV | US equity |  |  |
Classification of the methodology used by the Company to fair value its investments |  |  |
Fair Value of Plan Assets | 0 | 0 |
NAV | Other equity |  |  |
Classification of the methodology used by the Company to fair value its investments |  |  |
Fair Value of Plan Assets | 0 | 0 |
NAV | Government |  |  |
Classification of the methodology used by the Company to fair value its investments |  |  |
Fair Value of Plan Assets | 0 | 0 |
NAV | Corporate |  |  |
Classification of the methodology used by the Company to fair value its investments |  |  |
Fair Value of Plan Assets | 0 | 0 |
NAV | Other |  |  |
Classification of the methodology used by the Company to fair value its investments |  |  |
Fair Value of Plan Assets | 0 | 0 |
NAV | Mutual funds |  |  |
Classification of the methodology used by the Company to fair value its investments |  |  |
Fair Value of Plan Assets | 0 | 0 |
NAV | Other |  |  |
Classification of the methodology used by the Company to fair value its investments |  |  |
Fair Value of Plan Assets |  | 0 |
NAV | Open-ended investments measured at NAV |  |  |
Classification of the methodology used by the Company to fair value its investments |  |  |
Fair Value of Plan Assets | 1,142 | 1,006 |
NAV | Common collective trusts measured at NAV |  |  |
Classification of the methodology used by the Company to fair value its investments |  |  |
Fair Value of Plan Assets | 519 | 586 |
Level 1 |  |  |
Classification of the methodology used by the Company to fair value its investments |  |  |
Fair Value of Plan Assets | 586 | 440 |
Level 1 | Cash and cash equivalents |  |  |
Classification of the methodology used by the Company to fair value its investments |  |  |
Fair Value of Plan Assets | 39 | 40 |
Level 1 | Net in-transits |  |  |
Classification of the methodology used by the Company to fair value its investments |  |  |
Fair Value of Plan Assets | (27) | (9) |
Level 1 | Canadian equity |  |  |
Classification of the methodology used by the Company to fair value its investments |  |  |
Fair Value of Plan Assets | 109 | 96 |
Level 1 | US equity |  |  |
Classification of the methodology used by the Company to fair value its investments |  |  |
Fair Value of Plan Assets | 312 | 141 |
Level 1 | Other equity |  |  |
Classification of the methodology used by the Company to fair value its investments |  |  |
Fair Value of Plan Assets | 140 | 112 |
Level 1 | Government |  |  |
Classification of the methodology used by the Company to fair value its investments |  |  |
Fair Value of Plan Assets | 0 | 0 |
Level 1 | Corporate |  |  |
Classification of the methodology used by the Company to fair value its investments |  |  |
Fair Value of Plan Assets | 0 | 0 |
Level 1 | Other |  |  |
Classification of the methodology used by the Company to fair value its investments |  |  |
Fair Value of Plan Assets | 0 | 4 |
Level 1 | Mutual funds |  |  |
Classification of the methodology used by the Company to fair value its investments |  |  |
Fair Value of Plan Assets | 13 | 50 |
Level 1 | Other |  |  |
Classification of the methodology used by the Company to fair value its investments |  |  |
Fair Value of Plan Assets |  | 6 |
Level 1 | Open-ended investments measured at NAV |  |  |
Classification of the methodology used by the Company to fair value its investments |  |  |
Fair Value of Plan Assets | 0 | 0 |
Level 1 | Common collective trusts measured at NAV |  |  |
Classification of the methodology used by the Company to fair value its investments |  |  |
Fair Value of Plan Assets | 0 | 0 |
Level 2 |  |  |
Classification of the methodology used by the Company to fair value its investments |  |  |
Fair Value of Plan Assets | 246 | 266 |
Level 2 | Cash and cash equivalents |  |  |
Classification of the methodology used by the Company to fair value its investments |  |  |
Fair Value of Plan Assets | 0 | 0 |
Level 2 | Net in-transits |  |  |
Classification of the methodology used by the Company to fair value its investments |  |  |
Fair Value of Plan Assets | 0 | 0 |
Level 2 | Canadian equity |  |  |
Classification of the methodology used by the Company to fair value its investments |  |  |
Fair Value of Plan Assets | 0 | 0 |
Level 2 | US equity |  |  |
Classification of the methodology used by the Company to fair value its investments |  |  |
Fair Value of Plan Assets | 0 | 0 |
Level 2 | Other equity |  |  |
Classification of the methodology used by the Company to fair value its investments |  |  |
Fair Value of Plan Assets | 0 | 0 |
Level 2 | Government |  |  |
Classification of the methodology used by the Company to fair value its investments |  |  |
Fair Value of Plan Assets | 132 | 172 |
Level 2 | Corporate |  |  |
Classification of the methodology used by the Company to fair value its investments |  |  |
Fair Value of Plan Assets | 92 | 90 |
Level 2 | Other |  |  |
Classification of the methodology used by the Company to fair value its investments |  |  |
Fair Value of Plan Assets | 22 | 5 |
Level 2 | Mutual funds |  |  |
Classification of the methodology used by the Company to fair value its investments |  |  |
Fair Value of Plan Assets | 0 | 0 |
Level 2 | Other |  |  |
Classification of the methodology used by the Company to fair value its investments |  |  |
Fair Value of Plan Assets |  | (1) |
Level 2 | Open-ended investments measured at NAV |  |  |
Classification of the methodology used by the Company to fair value its investments |  |  |
Fair Value of Plan Assets | 0 | 0 |
Level 2 | Common collective trusts measured at NAV |  |  |
Classification of the methodology used by the Company to fair value its investments |  |  |
Fair Value of Plan Assets | $ 0 | $ 0 |

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