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Income Taxes - Components of Income Tax Expense (Recovery) Recognized in Equity (Detail) - CAD ($)
$ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Major components of tax expense (income) [abstract]    
Current income tax expense (recovery) $ 5 $ 5
Deferred income tax expense (recovery) (8) (15)
Total income tax recognized directly in equity $ (3) $ (10)