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Changes in Accumulated other comprehensive income ("AOCI") by component (Tables) | 6 Months Ended
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Jun. 30, 2025
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] |
Changes in Accumulated Other Comprehensive Income by Component | Changes in AOCI attributable to controlling shareholders, net of tax, by component are as follows:
(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, April 1, 2025 | $ | 3,385 |  | $ | 10 |  | $ | (737) |  | $ | (5) |  | $ | 2,653 |
Other comprehensive (loss) income before reclassifications | (1,707) |  | — |  | — |  | 3 |  | (1,704) |
Amounts reclassified from AOCI | — |  | 1 |  | 1 |  | — |  | 2 |
Net other comprehensive (loss) income | (1,707) |  | 1 |  | 1 |  | 3 |  | (1,702) |
Balance as at June 30, 2025 | $ | 1,678 |  | $ | 11 |  | $ | (736) |  | $ | (2) |  | $ | 951 |
Opening balance, April 1, 2024 | $ | 1,522 |  | $ | 6 |  | $ | (1,454) |  | $ | 3 |  | $ | 77 |
Other comprehensive income (loss) before reclassifications | 294 |  | — |  | — |  | (2) |  | 292 |
Amounts reclassified from AOCI | — |  | 2 |  | 8 |  | — |  | 10 |
Net other comprehensive income (loss) | 294 |  | 2 |  | 8 |  | (2) |  | 302 |
Balance as at June 30, 2024 | $ | 1,816 |  | $ | 8 |  | $ | (1,446) |  | $ | 1 |  | $ | 379 |

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