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Other comprehensive income (loss) information (Tables) | 9 Months Ended
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Sep. 30, 2025
Equity [Abstract] |
Changes in accumulated other comprehensive income (loss) | Changes in accumulated other comprehensive income (loss):
millions of Canadian dollars | 2025 |  | 2024 |
Balance at January 1 | (214) |  | (677) |
Postretirement benefits liability adjustment: |  |
Current period change excluding amounts reclassified from accumulated other comprehensive income | 12 |  | 4 |
Amounts reclassified from accumulated other comprehensive income | 15 |  | 38 |
Balance at September 30 | (187) |  | (635) |
Amounts reclassified out of accumulated other comprehensive income (loss) - before tax income (expense) |
Amounts reclassified out of accumulated other comprehensive income (loss) – before-tax income (expense):
| Third Quarter | Nine Months to September 30
millions of Canadian dollars | 2025 |  | 2024 |  | 2025 |  | 2024 |
Amortization of postretirement benefits liability adjustment included in net benefit cost (a) | (7) |  | (16) |  | (20) |  | (50) |
(a) This accumulated other comprehensive income component is included in the computation of net benefit cost (note 4).
Income tax expense (credit) for components of other comprehensive income (loss) |
Income tax expense (credit) for components of other comprehensive income (loss):
| Third Quarter | Nine Months to September 30
millions of Canadian dollars | 2025 |  | 2024 |  | 2025 |  | 2024 |
Postretirement benefits liability adjustments: |  |  |  |
Postretirement benefits liability adjustment (excluding amortization) | — |  | 1 |  | 4 |  | 1 |
Amortization of postretirement benefits liability adjustment included in net benefit cost | 2 |  | 3 |  | 5 |  | 12 |
Total | 2 |  | 4 |  | 9 |  | 13 |

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