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Income Taxes - Income Tax Benefit (Expense) Recognized Directly in Equity (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Recognized in other comprehensive income:    
Current income tax benefit (expense) $ (2) $ 0
Deferred income tax benefit (expense) (41) (101)
Total income tax benefit (expense) included in other comprehensive income (loss) (43) (101)
Current income tax benefit (expense) (16) 0
Deferred income tax benefit (expense) 94 (24)
Total recognized in equity, other than other comprehensive income 78 (24)
Total income tax benefit (expense) recorded in equity, including tax benefit (expense) recorded in Other comprehensive income $ 35 $ (125)