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Income Taxes - Schedule of Amounts of Tax Pools Available, Including Tax Losses (Detail) - CAD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
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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 | $ 15,439 | $ 17,682
Canada |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Amounts of tax pools available, including tax losses | 8,505 | 11,167
United States |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Amounts of tax pools available, including tax losses | 6,477 | 5,915
Asia Pacific |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Amounts of tax pools available, including tax losses | $ 457 | $ 600

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