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v3.25.2

Employee retirement benefits | 6 Months Ended
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Jun. 30, 2025
Retirement Benefits [Abstract] |
Employee retirement benefits | Employee retirement benefits The components of net benefit cost were as follows:
| Second Quarter | Six Months to June 30
millions of Canadian dollars | 2025 |  | 2024 |  | 2025 |  | 2024 |
Pension benefits: |  |  |  |
Service cost | 46 |  | 46 |  | 93 |  | 92 |
Interest cost | 91 |  | 92 |  | 184 |  | 183 |
Expected return on plan assets | (98) |  | (114) |  | (197) |  | (227) |
Amortization of prior service cost | 8 |  | 7 |  | 14 |  | 14 |
Amortization of actuarial loss (gain) | 3 |  | 12 |  | 6 |  | 24 |
Net benefit cost | 50 |  | 43 |  | 100 |  | 86 |
Other postretirement benefits: |  |  |  |
Service cost | 1 |  | 3 |  | 2 |  | 7 |
Interest cost | 6 |  | 6 |  | 11 |  | 12 |
Amortization of prior service cost (credit) | (1) |  | — |  | (2) |  | — |
Amortization of actuarial loss (gain) | (3) |  | (2) |  | (5) |  | (4) |
Net benefit cost | 3 |  | 7 |  | 6 |  | 15 |

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