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Accumulated Other Comprehensive Income (Loss) - Schedule of Accumulated Other Comprehensive Income (Loss) (Detail) - CAD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022
Disclosure of accumulated other comprehensive income loss [line items] |  |
Beginning balance | $ 1,470 | $ 684
Other Comprehensive Income (Loss), Before Tax | (281) | 811
Reclassification on Divestiture (Note 5) | 12 |
Income Tax (Expense) Recovery | 7 | (25)
Ending balance | 1,208 | 1,470
Pension and Other Post-Retirement Benefits |  |
Disclosure of accumulated other comprehensive income loss [line items] |  |
Beginning balance | 99 | 28
Other Comprehensive Income (Loss), Before Tax | (58) | 96
Reclassification on Divestiture (Note 5) | 0 |
Income Tax (Expense) Recovery | 14 | (25)
Ending balance | 55 | 99
Private Equity Instruments |  |
Disclosure of accumulated other comprehensive income loss [line items] |  |
Beginning balance | 29 | 27
Other Comprehensive Income (Loss), Before Tax | 63 | 2
Reclassification on Divestiture (Note 5) | 0 |
Income Tax (Expense) Recovery | (7) | 0
Ending balance | 85 | 29
Foreign Currency Translation Adjustment |  |
Disclosure of accumulated other comprehensive income loss [line items] |  |
Beginning balance | 1,342 | 629
Other Comprehensive Income (Loss), Before Tax | (286) | 713
Reclassification on Divestiture (Note 5) | 12 |
Income Tax (Expense) Recovery | 0 | 0
Ending balance | $ 1,068 | $ 1,342

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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 2023-01-01 -Paragraph 55 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_55&doctype=Standard -URIDate 2023-03-23 + 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 12 -IssueDate 2023-01-01 -Paragraph 81 -Subparagraph ab -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=12&code=ifrs-tx-2023-en-r&anchor=para_81_ab&doctype=Standard -URIDate 2023-03-23 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2023-01-01 -Paragraph 90 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_90&doctype=Standard -URIDate 2023-03-23 + 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 2023-01-01 -Paragraph 91 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_91_b&doctype=Standard -URIDate 2023-03-23 + Details
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