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Income Taxes - Tax Reconciliation (Details) - CAD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Income Taxes [Abstract] |  |
Net income (loss) before income taxes | $ 7,090 | $ 6,452
Income tax expenses (recoveries) at Canadian statutory tax rate | 1,971 | 1,794
Increase (decrease) in income taxes due to: |  |
Tax-exempt investment income | (306) | (199)
Differences in tax rate on income not subject to tax in Canada | (938) | (770)
Adjustments to taxes related to prior years | (98) | (212)
Tax losses and temporary differences not recognized as deferred taxes | 94 | (38)
Global Minimum Taxes | 231 | 0
Other differences | 258 | 270
Income tax expenses (recoveries) | $ 1,212 | $ 845

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