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Income Taxes - Components of Income Tax Expense (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Income Taxes [Abstract]      
Current income tax expense $ 143 $ 50 $ 65
Deferred income tax (recovery) expense related to the origination and reversal of temporary differences (45) 215 153
Deferred income tax recovery related to temporary difference on investment in subsidiaries (5) (3) (2)
Write-down (reversal of write-down) of unrecognized deferred income tax assets (13) (178) (24)
Income tax expense 80 84 192
Current income tax expense 143 50 65
Deferred income tax (recovery) expense $ (63) $ 34 $ 127