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Income Taxes - Components of Income Tax Expense (Recovery) Recognized in Consolidated Statements of Income (Detail) - CAD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021
Current tax |  |
Current year | $ 1,097 | $ 1,390
Adjustments related to prior year | (263) | (50)
Current tax | 834 | 1,340
Deferred tax |  |
Change related to temporary differences | 706 | (139)
Adjustments related to prior years | 226 | 12
Effects of change in tax rates in Canada | (201) |
Total deferred tax | 731 | (127)
Income tax expense | $ 1,565 | $ 1,213

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