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Employee Future Benefits - Schedule of Allocation of and Fair Value of Plan Assets (Details) - CAD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |
2024 Target Allocation | 100.00% |  |
Actual plan asset allocation | 100.00% | 100.00% |
Fair value of plan assets | $ 4,119 | $ 3,743 |
Equities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
2024 Target Allocation | 46.00% |  |
Actual plan asset allocation | 47.00% | 46.00% |
Fair value of plan assets | $ 1,941 | $ 1,725 |
Fixed income |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
2024 Target Allocation | 46.00% |  |
Actual plan asset allocation | 45.00% | 45.00% |
Fair value of plan assets | $ 1,829 | $ 1,679 |
Real estate |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
2024 Target Allocation | 7.00% |  |
Actual plan asset allocation | 7.00% | 8.00% |
Fair value of plan assets | $ 300 | $ 291 |
Cash and other |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
2024 Target Allocation | 1.00% |  |
Actual plan asset allocation | 1.00% | 1.00% |
Fair value of plan assets | $ 49 | $ 48 |
Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 1,064 | 932 |
Level 1 | Equities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 773 | 666 |
Level 1 | Fixed income |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 268 | 232 |
Level 1 | Real estate |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Level 1 | Cash and other |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 23 | 34 |
Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 2,755 | 2,520 |
Level 2 | Equities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 1,168 | 1,059 |
Level 2 | Fixed income |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 1,561 | 1,447 |
Level 2 | Real estate |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Level 2 | Cash and other |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 26 | 14 |
Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 300 | 291 | $ 282
Level 3 | Equities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Level 3 | Fixed income |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Level 3 | Real estate |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 300 | 291 |
Level 3 | Cash and other |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | $ 0 | $ 0 |

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