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Income Taxes - Additional Information (Detail) - CAD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Disclosure of income taxes [line items] |  |
Deferred Income Taxes | $ 1,064 | $ 696
Deferred tax liability | 0 | 0
Amounts of tax pools available, including tax losses | 20,342 | 16,952
Canadian Federal Non Capital Losses |  |
Disclosure of income taxes [line items] |  |
Amounts of tax pools available, including tax losses | 197 | 126
US Federal Net Operating Losses |  |
Disclosure of income taxes [line items] |  |
Amounts of tax pools available, including tax losses | 3,000 | 3,700
Canadian Net Capital Losses |  |
Disclosure of income taxes [line items] |  |
Amounts of tax pools available, including tax losses | 85 | 59
Net capital losses associated with unrealized foreign exchange losses | $ 362 | $ 141

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- Definition The amount of tax expense or income relating to changes in deferred tax liabilities and deferred tax assets, recognised in profit or loss. [Refer: Deferred tax assets; Deferred tax expense (income); Deferred tax liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2024-01-01 -Paragraph 81 -Subparagraph g -Clause ii -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=12&code=ifrs-tx-2024-en-r&anchor=para_81_g_ii&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The amount of deferred tax assets net of deferred tax liabilities, when the absolute amount of deferred tax assets is greater than the absolute amount of deferred tax liabilities. [Refer: Deferred tax assets; Deferred tax liabilities] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 12 -IssueDate 2024-01-01 -Paragraph 81 -Subparagraph g -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=12&code=ifrs-tx-2024-en-r&anchor=para_81_g_i&doctype=Standard -URIDate 2024-03-27 + Details
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