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Income Taxes - Schedule of Amounts of Tax Pools Available, Including Tax Losses (Detail) - CAD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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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 | $ 9,657 | $ 8,761
Canada [Member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |
Amounts of tax pools available, including tax losses | 6,540 | 6,113
United States [Member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |
Amounts of tax pools available, including tax losses | $ 3,117 | $ 2,648

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