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Pension and other benefits (Tables) | 9 Months Ended
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Sep. 30, 2025
Retirement Benefits [Abstract] |
Net Periodic Benefit Cost for Defined Benefit Pension Plans and Other Benefits | 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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- Definition Tabular disclosure of the costs related to the various types of retirement plans including defined benefit pension plan cost, defined contribution plan cost, other postretirement benefit plan cost, and net periodic benefit cost. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 1 -SubTopic 20 -Topic 715 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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