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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
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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- Definition

Tax pools available.

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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table.

+ References

No definition available.

+ Details

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