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Income Taxes - Schedule of Components of Income Tax Expense (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Canadian    
Earnings before income tax expense $ 526 $ 447
Current income tax 71 93
Deferred income tax 17 (41)
Total Canadian 88 52
Foreign    
Earnings before income tax expense 1,544 1,356
Current income tax 17 14
Deferred income tax 255 223
Total Foreign 272 237
Income tax expense $ 360 $ 289