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Accumulated Other Comprehensive Income (Loss) - Schedule of Accumulated Other Comprehensive Income (Loss) (Detail) - CAD ($) $ in Millions | 9 Months Ended
--- | ---
Sep. 30, 2024 | Sep. 30, 2023
Disclosure of accumulated other comprehensive income loss [line items] |  |
Beginning balance | $ 1,208 | $ 1,470
Other Comprehensive Income (Loss), Before Tax | 372 | (23)
Reclassification on Divestiture |  | 12
Income Tax (Expense) Recovery | (19) | (5)
Ending balance | 1,561 | 1,454
Pension and Other Post-Employment Benefits |  |
Disclosure of accumulated other comprehensive income loss [line items] |  |
Beginning balance | 55 | 99
Other Comprehensive Income (Loss), Before Tax | 14 | 20
Reclassification on Divestiture |  | 0
Income Tax (Expense) Recovery | (3) | (5)
Ending balance | 66 | 114
Private Equity Investments |  |
Disclosure of accumulated other comprehensive income loss [line items] |  |
Beginning balance | 85 | 29
Other Comprehensive Income (Loss), Before Tax | 139 | 0
Reclassification on Divestiture |  | 0
Income Tax (Expense) Recovery | (16) | 0
Ending balance | 208 | 29
Foreign Currency Translation Adjustment |  |
Disclosure of accumulated other comprehensive income loss [line items] |  |
Beginning balance | 1,068 | 1,342
Other Comprehensive Income (Loss), Before Tax | 219 | (43)
Reclassification on Divestiture |  | 12
Income Tax (Expense) Recovery | 0 | 0
Ending balance | $ 1,287 | $ 1,311

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- Definition Reclassifications On Divestitures Relating To Components Of Other Comprehensive Income + References No definition available. + Details
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- Definition The amount of accumulated items of income and expense (including reclassification adjustments) that are not recognised in profit or loss as required or permitted by other IFRSs. [Refer: IFRSs [member]; Other comprehensive income] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 55 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_55&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The amount of income tax relating to amounts recognised in other comprehensive income. [Refer: Other comprehensive income] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 90 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_90&doctype=Standard -URIDate 2024-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2024-01-01 -Paragraph 81 -Subparagraph ab -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=12&code=ifrs-tx-2024-en-r&anchor=para_81_ab&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The amount of other comprehensive income, before tax. [Refer: Other comprehensive income] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 91 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_91_b&doctype=Standard -URIDate 2024-03-27 + Details
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