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Employee retirement benefits (Tables) | 9 Months Ended
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Sep. 30, 2025
Retirement Benefits [Abstract] |
Schedule of net benefit costs | The components of net benefit cost were as follows:
| Third Quarter | Nine Months to September 30
millions of Canadian dollars | 2025 |  | 2024 |  | 2025 |  | 2024 |
Pension benefits: |  |  |  |
Service cost | 46 |  | 47 |  | 139 |  | 139 |
Interest cost | 93 |  | 91 |  | 277 |  | 274 |
Expected return on plan assets | (99) |  | (113) |  | (296) |  | (340) |
Amortization of prior service cost | 7 |  | 7 |  | 21 |  | 21 |
Amortization of actuarial loss (gain) | 2 |  | 11 |  | 8 |  | 35 |
Net pension enhancement | 19 |  | — |  | 19 |  | — |
Net benefit cost | 68 |  | 43 |  | 168 |  | 129 |
Other postretirement benefits: |  |  |  |
Service cost | 2 |  | 3 |  | 4 |  | 10 |
Interest cost | 4 |  | 7 |  | 15 |  | 19 |
Amortization of prior service cost (credit) | (1) |  | — |  | (3) |  | — |
Amortization of actuarial loss (gain) | (1) |  | (2) |  | (6) |  | (6) |
Net other postretirement benefits enhancement | 1 |  | — |  | 1 |  | — |
Net benefit cost | 5 |  | 8 |  | 11 |  | 23 |

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- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (q) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-5 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 715 -SubTopic 20 -Subparagraph (h) -Name Accounting Standards Codification -Paragraph 1 -Section 50 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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