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Income Taxes - Components of Income Tax Expense (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Income Taxes [Abstract]      
Current income tax expense $ 50 $ 65 $ 56
Deferred income tax expense (recovery) related to the origination and reversal of temporary differences 215 153 (145)
Deferred income tax recovery related to temporary difference on investment in subsidiaries (3) (2) 0
Deferred income tax expense (recovery) arising from the unrecognized deferred income tax assets (178) (24) 134
Current income tax expense 50 65 56
Deferred income tax expense (recovery) 34 127 (11)
Income tax expense 84 $ 192 $ 45
Deferred tax assets yet to be recognized $ 157