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Income Taxes - Income Tax Expenses (Recoveries) 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 expenses (recoveries) $ 174 $ 320
Deferred income tax expenses (recoveries) 885 (326)
Total recognized in other comprehensive income 1,059 (6)
Recognized in equity, other than other comprehensive income    
Current income tax expenses (recoveries) 4 5
Deferred income tax expenses (recoveries) (5) (4)
Total income tax recognized directly in equity $ (1) $ 1