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Income Taxes - Components of Income Tax Expense (Recovery) Recognized in Equity (Detail) - CAD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Major components of tax expense (income) [abstract]    
Current income tax expenses (recoveries) $ 5 $ 5
Deferred income tax expenses (recoveries) (4) (8)
Total income tax recognized directly in equity $ 1 $ (3)