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Accumulated Other Comprehensive Income (Loss) (Tables) | 9 Months Ended
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Sep. 30, 2021
Disclosure Of Accumulated Other Comprehensive Income Loss [Abstract] |
Summary of Accumulated Other Comprehensive Income (Loss) |
| Defined Benefit Pension Plan |  |  | Private Equity Instruments |  |  | Foreign Currency Translation Adjustment |  |  | Total |
As at December 31, 2019 |  | (2) |  |  |  | 27 |  |  |  | 802 |  |  |  | 827 |
Other Comprehensive Income (Loss), Before Tax |  | (4) |  |  |  | 1 |  |  |  | 127 |  |  |  | 124 |
Income Tax (Expense) Recovery |  | 1 |  |  |  | — |  |  |  | — |  |  |  | 1 |
As at September 30, 2020 |  | (5) |  |  |  | 28 |  |  |  | 929 |  |  |  | 952 |
As at December 31, 2020 |  | (10) |  |  |  | 27 |  |  |  | 758 |  |  |  | 775 |
Other Comprehensive Income (Loss), Before Tax |  | 27 |  |  |  | — |  |  |  | (76) |  |  |  | (49) |
Income Tax (Expense) Recovery |  | (6) |  |  |  | — |  |  |  | — |  |  |  | (6) |
As at September 30, 2021 |  | 11 |  |  |  | 27 |  |  |  | 682 |  |  |  | 720 |

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- Definition Disclosure of accumulated other comprehensive income loss. + References No definition available. + Details
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