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Accumulated Other Comprehensive Income (Loss) (Tables) | 9 Months Ended
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Sep. 30, 2025
Disclosure Of Accumulated Other Comprehensive Income Loss [Abstract] |
Summary of Accumulated Other Comprehensive Income (Loss) |
| Pension and Other Post-Employment Benefits |  | Private Equity Investments |  | Foreign Currency Translation Adjustment |  | Total
As at December 31, 2023 | 55 |  | 85 |  | 1,068 |  | 1,208
Other Comprehensive Income (Loss), Before Tax | 14 |  | 139 |  | 219 |  | 372
Income Tax (Expense) Recovery | (3) |  | (16) |  | — |  | (19)
As at September 30, 2024 | 66 |  | 208 |  | 1,287 |  | 1,561
As at December 31, 2024 | 69 |  | 156 |  | 2,088 |  | 2,313
Other Comprehensive Income (Loss), Before Tax | 13 |  | (26) |  | (420) |  | (433)
Reclassification on Divestiture (Note 5) | — |  | — |  | (1,261) |  | (1,261)
Income Tax (Expense) Recovery | (3) |  | 3 |  | — |  | —
As at September 30, 2025 | 79 |  | 133 |  | 407 |  | 619

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