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Income Taxes - Schedule of Amounts of Tax Pools Available, Including Tax Losses (Detail) - CAD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
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Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Amounts of tax pools available, including tax losses | $ 20,342 | $ 16,952
Canada |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Amounts of tax pools available, including tax losses | 10,086 | 8,547
United States |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Amounts of tax pools available, including tax losses | 9,905 | 8,058
Asia Pacific |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Amounts of tax pools available, including tax losses | $ 351 | $ 347

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