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Accumulated Other Comprehensive Income (Loss) - Schedule of Accumulated Other Comprehensive Income (Loss) (Detail) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021
Disclosure of accumulated other comprehensive income loss [line items] |  |
Beginning balance | $ 684 | $ 775
Other Comprehensive Income (Loss), Before Tax | 811 | (82)
Income Tax (Expense) Recovery | (25) | (9)
Ending balance | 1,470 | 684
Pension and Other Post-Retirement Benefits |  |
Disclosure of accumulated other comprehensive income loss [line items] |  |
Beginning balance | 28 | (10)
Other Comprehensive Income (Loss), Before Tax | 96 | 47
Income Tax (Expense) Recovery | (25) | (9)
Ending balance | 99 | 28
Private Equity Instruments |  |
Disclosure of accumulated other comprehensive income loss [line items] |  |
Beginning balance | 27 | 27
Other Comprehensive Income (Loss), Before Tax | 2 | 0
Income Tax (Expense) Recovery | 0 | 0
Ending balance | 29 | 27
Foreign Currency Translation Adjustment |  |
Disclosure of accumulated other comprehensive income loss [line items] |  |
Beginning balance | 629 | 758
Other Comprehensive Income (Loss), Before Tax | 713 | (129)
Income Tax (Expense) Recovery | 0 | 0
Ending balance | $ 1,342 | $ 629

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- Definition Disclosure of accumulated other comprehensive income loss. + 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 2022-03-24 -Paragraph 55 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2022-en-r&anchor=para_55&doctype=Standard -URIDate 2022-03-24 + 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 2022-03-24 -Paragraph 81 -Subparagraph ab -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=12&code=ifrs-tx-2022-en-r&anchor=para_81_ab&doctype=Standard -URIDate 2022-03-24 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2022-03-24 -Paragraph 90 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2022-en-r&anchor=para_90&doctype=Standard -URIDate 2022-03-24 + 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 2022-03-24 -Paragraph 91 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2022-en-r&anchor=para_91_b&doctype=Standard -URIDate 2022-03-24 + Details
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