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Income Taxes - Additional Information (Detail) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021
Statement [line items] |  |
Effective income tax rate | 27.50% | 26.50%
Current tax receivable | $ 1,135 | $ 660
Current tax payable | 195 | 357
Deferred tax assets | 5,423 | 5,254
Deferred tax assets - recognition dependent on future taxable profits | 40 | 942
Operating tax loss carry forward | 3,902 | 2,689
Operating tax loss carry forward expired in future | 3,684 |
Operating tax loss carry forward without expiration date | 218 |
Capital tax loss carry forward | 1 | 1
Tax benefit on loss carry forwards for which deferred tax asset recognized | 701 | 517
Tax benefit of loss carry forwards for which no deferred tax asset recognized | 211 | 120
Tax credit carry forwards which expire in future | 273 | 200
Tax credit carryforwards of which benefit not recognized | $ 164 | 154
Tax credit/Loss carryforwards expiration period | between the years 2026 and 2042 |
Deferred tax liability | $ 2,774 | 2,769
Aggregate amount of taxable temporary differences associated with the Company's own investments in subsidiaries, not included in financial statements | 20,625 | 24,034
Unused tax credits [member] |  |
Statement [line items] |  |
Deferred tax assets | 507 | 490
Temporary differences [member] |  |
Statement [line items] |  |
Deferred tax assets | $ 1,829 | $ 1,867

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