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Income Taxes - Additional Information (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Current tax assets | $ 1,070 | $ 1,056
Current tax liabilities | $ 453 | $ 147
Average effective tax rate | 27.80% | 27.80%
Deferred tax assets | $ 5,884 | $ 6,739
Deferred tax assets, recognition dependent on future taxable profits | 27 | 6,136
Operating tax loss carry forward | 4,837 | 3,549
Operating tax loss carry forward expired in future | 4,068 |
Operating tax loss carry forward without expiration date | 769 |
Capital tax loss carry forward | 27 | 5
Tax benefit on loss carry forwards for which deferred tax asset recognized | 851 | 670
Tax benefit of loss carry forwards for which no deferred tax asset recognized | 356 | 222
Tax credit carry forwards which expire in future | 412 | 282
Tax credit carryforwards of which benefit not recognized | 174 | 160
Deferred tax liabilities | 1,890 | 1,697
Aggregate amount of taxable temporary differences associated with the Company's own investments in subsidiaries, not included in financial statements | 14,955 | 10,908
Tax credits |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unrecognised deferred tax asset for deductible temporary differences | 1,152 | 1,171
Temporary differences [member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deferred tax assets | $ 5,341 | $ 5,333

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