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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, 2023 | Sep. 30, 2022
Disclosure of accumulated other comprehensive income loss [line items] |  |
Beginning balance | $ 1,470 | $ 684
Other Comprehensive Income (Loss), Before Tax | (23) | 976
Income Tax (Expense) Recovery | (5) | (20)
Reclassification on Divestiture (Note 3) | 12 |
Ending balance | 1,454 | 1,640
Pension and Other Post-Employment Benefits |  |
Disclosure of accumulated other comprehensive income loss [line items] |  |
Beginning balance | 99 | 28
Other Comprehensive Income (Loss), Before Tax | 20 | 78
Income Tax (Expense) Recovery | (5) | (20)
Reclassification on Divestiture (Note 3) | 0 |
Ending balance | 114 | 86
Private Equity Instruments |  |
Disclosure of accumulated other comprehensive income loss [line items] |  |
Beginning balance | 29 | 27
Other Comprehensive Income (Loss), Before Tax | 0 | 2
Income Tax (Expense) Recovery | 0 | 0
Reclassification on Divestiture (Note 3) | 0 |
Ending balance | 29 | 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 | (43) | 896
Income Tax (Expense) Recovery | 0 | 0
Reclassification on Divestiture (Note 3) | 12 |
Ending balance | $ 1,311 | $ 1,525

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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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