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Employee Future Benefits - Summary of Benefit Obligations and Fair Value (Narrative) (Details) - CAD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
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DBP Plans |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Projected benefit obligation | $ 1,668 | $ 1,940
Plan with projected benefit obligation, fair value of plan assets | 1,460 | 1,681
Accumulated benefit obligation | 195 | 268
Plan with accumulated benefit obligation, fair value of plan assets | 62 | 130
OPEB Plans |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Accumulated benefit obligation | 296 | 320
Plan with accumulated benefit obligation, fair value of plan assets | $ 44 | $ 36

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