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Accumulated Other Comprehensive Income (Loss) - Summary of Changes in Accumulated Other Comprehensive Income (Loss), Net of Tax (Details) - CAD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021
Disclosure of analysis of other comprehensive income by item [line items] |  |
Balance, beginning of period | $ 988 | $ 1,594
Other comprehensive income (loss) | (310) | (606)
Balance, end of period | 678 | 988
Unrealized foreign currency translation gains (losses), net of hedging activities |  |
Disclosure of analysis of other comprehensive income by item [line items] |  |
Balance, beginning of period | 953 | 1,155
Other comprehensive income (loss) | 934 | (202)
Balance, end of period | 1,887 | 953
Unrealized gains (losses) on available-for-sale assets |  |
Disclosure of analysis of other comprehensive income by item [line items] |  |
Balance, beginning of period | 266 | 632
Other comprehensive income (loss) | (1,290) | (366)
Balance, end of period | (1,024) | 266
Unrealized gains (losses) on cash flow hedges |  |
Disclosure of analysis of other comprehensive income by item [line items] |  |
Balance, beginning of period | (7) | (13)
Other comprehensive income (loss) | (11) | 6
Balance, end of period | (18) | (7)
Share of other comprehensive income (loss) in joint ventures and associates |  |
Disclosure of analysis of other comprehensive income by item [line items] |  |
Balance, beginning of period | (47) | (42)
Other comprehensive income (loss) | (109) | (5)
Balance, end of period | (156) | (47)
Remeasurement of defined benefit plans |  |
Disclosure of analysis of other comprehensive income by item [line items] |  |
Balance, beginning of period | (322) | (283)
Other comprehensive income (loss) | 168 | (39)
Balance, end of period | (154) | (322)
Revaluation of property, plant and equipment |  |
Disclosure of analysis of other comprehensive income by item [line items] |  |
Balance, beginning of period | 145 | 145
Other comprehensive income (loss) | (2) | 0
Balance, end of period | 143 | 145
Participating policyholders |  |
Disclosure of analysis of other comprehensive income by item [line items] |  |
Balance, beginning of period | 2 | 5
Other comprehensive income (loss) | 21 | (3)
Balance, end of period | 23 | 2
Non-controlling interests’ equity |  |
Disclosure of analysis of other comprehensive income by item [line items] |  |
Balance, beginning of period | 0 | 0
Other comprehensive income (loss) | 4 | 0
Balance, end of period | 4 | 0
Shareholders |  |
Disclosure of analysis of other comprehensive income by item [line items] |  |
Balance, beginning of period | 986 | 1,589
Other comprehensive income (loss) | (335) | (603)
Balance, end of period | $ 651 | $ 986

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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 and expense (including reclassification adjustments) that is not recognised in profit or loss as required or permitted by IFRSs. [Refer: IFRSs [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2022-03-24 -Paragraph B12 -Subparagraph b -Clause viii -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2022-en-r&anchor=para_B12_b_viii&doctype=Appendix&subtype=B -URIDate 2022-03-24 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2022-03-24 -Paragraph 81A -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2022-en-r&anchor=para_81A_b&doctype=Standard -URIDate 2022-03-24 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2022-03-24 -Paragraph 91 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2022-en-r&anchor=para_91_a&doctype=Standard -URIDate 2022-03-24 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2022-03-24 -Paragraph 106 -Subparagraph d -Clause ii -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2022-en-r&anchor=para_106_d_ii&doctype=Standard -URIDate 2022-03-24 + Details
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