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Changes in Accumulated other comprehensive income ("AOCI") by component (Tables) | 9 Months Ended
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Sep. 30, 2025
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] |
Changes in Accumulated Other Comprehensive Income by Component | Changes in AOCI and Accumulated other comprehensive loss ("AOCL") attributable to controlling shareholders, net of tax, by component are as follows:
| For the three months ended September 30
(in millions of Canadian dollars) | Foreign currency net of hedging activities | Derivatives | Pension and post- retirement defined benefit plans | Equity accounted investments | Total
Opening balance, July 1, 2025 | $ | 1,678 |  | $ | 11 |  | $ | (736) |  | $ | (2) |  | $ | 951 |
Other comprehensive income before reclassifications | 646 |  | — |  | — |  | 3 |  | 649 |
Amounts reclassified from AOCI | — |  | (1) |  | 3 |  | — |  | 2 |
Net other comprehensive income (loss) | 646 |  | (1) |  | 3 |  | 3 |  | 651 |
Balance as at September 30, 2025 | $ | 2,324 |  | $ | 10 |  | $ | (733) |  | $ | 1 |  | $ | 1,602 |
Opening balance, July 1, 2024 | $ | 1,816 |  | $ | 8 |  | $ | (1,446) |  | $ | 1 |  | $ | 379 |
Other comprehensive loss before reclassifications | (412) |  | — |  | — |  | (5) |  | (417) |
Amounts reclassified from AOCL | — |  | 1 |  | 9 |  | — |  | 10 |
Net other comprehensive (loss) income | (412) |  | 1 |  | 9 |  | (5) |  | (407) |
Balance as at September 30, 2024 | $ | 1,404 |  | $ | 9 |  | $ | (1,437) |  | $ | (4) |  | $ | (28) |
| For the nine months ended September 30
| Foreign currency net of hedging activities | Derivatives | Pension and post- retirement defined benefit plans | Equity accounted investments | Total
Opening balance, January 1, 2025 | $ | 3,413 |  | $ | 10 |  | $ | (738) |  | $ | (5) |  | $ | 2,680 |
Other comprehensive loss before reclassifications | (1,089) |  | — |  | — |  | 6 |  | (1,083) |
Amounts reclassified from AOCI | — |  | — |  | 5 |  | — |  | 5 |
Net other comprehensive (loss) income | (1,089) |  | — |  | 5 |  | 6 |  | (1,078) |
Balance as at September 30, 2025 | $ | 2,324 |  | $ | 10 |  | $ | (733) |  | $ | 1 |  | $ | 1,602 |
Opening balance, January 1, 2024 | $ | 837 |  | $ | 5 |  | $ | (1,463) |  | $ | 3 |  | $ | (618) |
Other comprehensive income (loss) before reclassifications | 567 |  | — |  | — |  | (7) |  | 560 |
Amounts reclassified from AOCL | — |  | 4 |  | 26 |  | — |  | 30 |
Net other comprehensive income (loss) | 567 |  | 4 |  | 26 |  | (7) |  | 590 |
Balance as at September 30, 2024 | $ | 1,404 |  | $ | 9 |  | $ | (1,437) |  | $ | (4) |  | $ | (28) |

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