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Income Taxes - Provision for Income Taxes (Detail) - CAD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Major Components Of Tax Expense Income [Line Items] |  |  |  |
Current Tax Expense (Recovery) | $ 250 | $ 563 | $ 1,015 | $ 1,116
Deferred Tax Expense (Recovery) | (46) | (2) | (124) | (416)
Tax Expense (Recovery) From Continuing Operations | 204 | 561 | 891 | 700
Canada |  |  |  |
Major Components Of Tax Expense Income [Line Items] |  |  |  |
Current Tax Expense (Recovery) | 184 | 484 | 830 | 941
United States |  |  |  |
Major Components Of Tax Expense Income [Line Items] |  |  |  |
Current Tax Expense (Recovery) | 0 | 4 | 2 | 4
Asia Pacific |  |  |  |
Major Components Of Tax Expense Income [Line Items] |  |  |  |
Current Tax Expense (Recovery) | 57 | 68 | 157 | 152
Other International |  |  |  |
Major Components Of Tax Expense Income [Line Items] |  |  |  |
Current Tax Expense (Recovery) | $ 9 | $ 7 | $ 26 | $ 19

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