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Accumulated Other Comprehensive Income (Loss) (Tables) | 12 Months Ended
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Dec. 31, 2024
Disclosure Of Accumulated Other Comprehensive Income Loss [Abstract] |
Summary of Accumulated Other Comprehensive Income (Loss) |
| Pension and Other Post-Retirement Benefits |  | Private Equity Instruments |  | Foreign Currency Translation Adjustment |  | Total
As at December 31, 2022 | 99 |  | 29 |  | 1,342 |  | 1,470
Other Comprehensive Income (Loss), Before Tax | (58) |  | 63 |  | (286) |  | (281)
Reclassification on Divestiture (Note 5) | — |  | — |  | 12 |  | 12
Income Tax (Expense) Recovery | 14 |  | (7) |  | — |  | 7
As at December 31, 2023 | 55 |  | 85 |  | 1,068 |  | 1,208
Other Comprehensive Income (Loss), Before Tax | 19 |  | 81 |  | 1,020 |  | 1,120
Income Tax (Expense) Recovery | (5) |  | (10) |  | — |  | (15)
As at December 31, 2024 | 69 |  | 156 |  | 2,088 |  | 2,313

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