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Income Taxes - Additional Information (Detail) - CAD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2025 | Jan. 01, 2022
Statement [line items] |  |  |  |
Effective income tax rate | 27.80% | 27.50% |  |
Current tax receivable | $ 1,056 | $ 1,135 |  |
Current tax payable | 147 | 195 |  |
Deferred tax assets | 6,739 | 6,708 | $ 6,708 | $ 7,767
Deferred tax assets - recognition dependent on future taxable profits | 6,136 |  |  |
Operating tax loss carry forward | 3,549 | 3,902 |  |
Operating tax loss carry forward expired in future | 3,300 |  |  |
Operating tax loss carry forward without expiration date | 249 |  |  |
Capital tax loss carry forward | 5 | 1 |  |
Tax benefit on loss carry forwards for which deferred tax asset recognized | 670 | 701 |  |
Tax benefit of loss carry forwards for which no deferred tax asset recognized | 222 | 211 |  |
Tax credit carry forwards which expire in future | 282 | 273 |  |
Tax credit carryforwards of which benefit not recognized | $ 160 | 164 |  |
Tax credit/Loss carryforwards expiration period | between the years 2026 and 2043 |  |  |
Deferred tax liability | $ 1,697 | 1,536 | $ 1,536 | $ 1,713
Aggregate amount of taxable temporary differences associated with the Company's own investments in subsidiaries, not included in financial statements | 10,908 | 11,439 |  |
Unused tax credits [member] |  |  |  |
Statement [line items] |  |  |  |
Deferred tax assets | 1,171 | 663 |  |
Temporary differences [member] |  |  |  |
Statement [line items] |  |  |  |
Deferred tax assets | $ 5,333 | $ 2,523 |  |

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