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Income Taxes - Schedule of Amounts of Tax Pools Available, Including Tax Losses (Detail) - CAD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Amounts of tax pools available, including tax losses	$ 17,682	$ 9,657
Canada
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Amounts of tax pools available, including tax losses	11,167	6,540
United States
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Amounts of tax pools available, including tax losses	5,915	3,117
Asia Pacific
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Amounts of tax pools available, including tax losses	$ 600	$ 0

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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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