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Income Taxes - Provision for Income Taxes (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
Major Components Of Tax Expense Income [Line Items] |  |  |  |  |  |  |
Current Tax Expense (Recovery) | $ 92 | $ (1) | $ 188 | $ (2) |  |  |
Deferred Tax Expense (Recovery) | 191 | (177) | 281 | (656) |  |  |
Tax Expense (Recovery) From Continuing Operations | 283 | (178) | 469 | (658) | $ (851) | $ (797) | $ (1,010)
Canada |  |  |  |  |  |  |
Major Components Of Tax Expense Income [Line Items] |  |  |  |  |  |  |
Current Tax Expense (Recovery) | 58 | (1) | 72 | (3) |  |  |
United States |  |  |  |  |  |  |
Major Components Of Tax Expense Income [Line Items] |  |  |  |  |  |  |
Current Tax Expense (Recovery) | 0 | 0 | 0 | 1 |  |  |
Asia Pacific |  |  |  |  |  |  |
Major Components Of Tax Expense Income [Line Items] |  |  |  |  |  |  |
Current Tax Expense (Recovery) | 34 | 0 | 115 | 0 |  |  |
Other International |  |  |  |  |  |  |
Major Components Of Tax Expense Income [Line Items] |  |  |  |  |  |  |
Current Tax Expense (Recovery) | $ 0 | $ 0 | $ 1 | $ 0 |  |  |

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