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Income Taxes - Summary of Reconciliation of Income Tax Expense (Detail) - CAD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022
Reconciliation of accounting profit multiplied by applicable tax rates [abstract] |  |
Net income (loss) before income taxes | $ 6,452 | $ (3,138)
ncome tax expenses (recoveries) at Canadian statutory tax rate | 1,794 | (863)
Increase (decrease) in income taxes due to: |  |
Tax-exempt investment income | (199) | (206)
Differences in tax rate on income not subject to tax in Canada | (770) | 118
Adjustments to taxes related to prior years | (212) | (37)
Tax losses and temporary differences not recognized as deferred taxes | (38) | 78
Tax rate change in Canada | 0 | (245)
Other differences | 270 | (4)
Income tax expenses (recoveries) | $ 845 | $ (1,159)

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