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Pension and other benefits | 9 Months Ended
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Sep. 30, 2025
Retirement Benefits [Abstract] |
Pension and other benefits | Pension and other benefits During the three and nine months ended September 30, 2025, the Company made contributions to its defined benefit pension plans of $3 million and $11 million, respectively (three and nine months ended September 30, 2024 - $5 million and $10 million, respectively). Net periodic benefit (recovery) cost for defined benefit pension plans and other benefits included the following components:
| For the three months ended September 30
| Pensions | Other benefits | Total
(in millions of Canadian dollars) | 2025 | 2024 | 2025 | 2024 | 2025 | 2024
Current service cost | $ | 22 |  | $ | 21 |  | $ | 3 |  | $ | 3 |  | $ | 25 |  | $ | 24 |
Other components of net periodic benefit (recovery) cost: |  |  |  |  |  |
Interest cost on benefit obligation | 117 |  | 116 |  | 5 |  | 6 |  | 122 |  | 122 |
Expected return on plan assets | (232) |  | (223) |  | — |  | — |  | (232) |  | (223) |
Recognized net actuarial loss | 1 |  | 10 |  | — |  | — |  | 1 |  | 10 |
Amortization of prior service costs | 2 |  | 2 |  | — |  | — |  | 2 |  | 2 |
Total other components of net periodic benefit (recovery) cost | (112) |  | (95) |  | 5 |  | 6 |  | (107) |  | (89) |
Net periodic benefit (recovery) cost | $ | (90) |  | $ | (74) |  | $ | 8 |  | $ | 9 |  | $ | (82) |  | $ | (65) |
| For the nine months ended September 30
| Pensions | Other benefits | Total
(in millions of Canadian dollars) | 2025 | 2024 | 2025 | 2024 | 2025 | 2024
Current service cost | $ | 64 |  | $ | 63 |  | $ | 10 |  | $ | 9 |  | $ | 74 |  | $ | 72 |
Other components of net periodic benefit (recovery) cost: |  |  |  |  |  |
Interest cost on benefit obligation | 350 |  | 350 |  | 16 |  | 18 |  | 366 |  | 368 |
Expected return on plan assets | (695) |  | (668) |  | — |  | — |  | (695) |  | (668) |
Recognized net actuarial loss (gain) | 5 |  | 30 |  | (1) |  | — |  | 4 |  | 30 |
Amortization of prior service costs | 4 |  | 5 |  | — |  | — |  | 4 |  | 5 |
Total other components of net periodic benefit (recovery) cost | (336) |  | (283) |  | 15 |  | 18 |  | (321) |  | (265) |
Net periodic benefit (recovery) cost | $ | (272) |  | $ | (220) |  | $ | 25 |  | $ | 27 |  | $ | (247) |  | $ | (193) |

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