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General and Administrative - Summary of General and Administrative Expenses (Detail) - CAD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
General And Administrative Expenses [Abstract] |  |  |  |  |  |  |
Salaries and Benefits | $ 52 | $ 35 | $ 201 | $ 105 |  |  |
Administrative and Other | 51 | 19 | 159 | 65 |  |  |
Stock-Based Compensation Expense (Recovery) (Note 24) | 28 | (3) | 97 | (15) |  |  |
Other Long-Term Incentive Benefits Expense (Recovery) | 27 | 0 | 34 | (31) |  |  |
General and Administrative Expenses | $ 158 | $ 51 | $ 491 | $ 124 | $ 292 | $ 331 | $ 1,020

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