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Changes in Accumulated other comprehensive income ("AOCI") by component | 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 ("AOCI") by component | Changes in Accumulated other comprehensive income ("AOCI") 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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- Definition The entire disclosure for comprehensive income, which includes, but is not limited to, 1) the amount of income tax expense or benefit allocated to each component of other comprehensive income, including reclassification adjustments, 2) the reclassification adjustments for each classification of other comprehensive income and 3) the ending accumulated balances for each component of comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(19)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477250/944-220-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(21)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483621/220-10-S99-2 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(23)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478524/942-220-S99-1 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 220 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/220/tableOfContent + Details
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