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Other comprehensive income (loss) information | 6 Months Ended
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Jun. 30, 2025
Equity [Abstract] |
Other comprehensive income (loss) information | Other comprehensive income (loss) information 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 | 10 |  | 25 |
Balance at June 30 | (192) |  | (648) |
Amounts reclassified out of accumulated other comprehensive income (loss) – before-tax income (expense):
| Second Quarter | Six Months to June 30
millions of Canadian dollars | 2025 |  | 2024 |  | 2025 |  | 2024 |
Amortization of postretirement benefits liability adjustment included in net benefit cost (a) | (7) |  | (17) |  | (13) |  | (34) |
(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):
| Second Quarter | Six Months to June 30
millions of Canadian dollars | 2025 |  | 2024 |  | 2025 |  | 2024 |
Postretirement benefits liability adjustments: |  |  |  |
Postretirement benefits liability adjustment (excluding amortization) | — |  | (1) |  | 4 |  | — |
Amortization of postretirement benefits liability adjustment included in net benefit cost | 2 |  | 4 |  | 3 |  | 9 |
Total | 2 |  | 3 |  | 7 |  | 9 |

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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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