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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, 2020 | Dec. 31, 2019
Disclosure of analysis of other comprehensive income by item [line items] |  |
Accumulated other comprehensive income, beginning balance | $ 1,472 | $ 1,704
Other comprehensiveincome (loss) | 122 | (232)
Accumulated other comprehensive income, ending balance | 1,594 | 1,472
Unrealized foreign currency translation gains (losses), net of hedging activities |  |
Disclosure of analysis of other comprehensive income by item [line items] |  |
Accumulated other comprehensive income, beginning balance | 1,359 | 1,923
Other comprehensiveincome (loss) | (204) | (564)
Accumulated other comprehensive income, ending balance | 1,155 | 1,359
Unrealized gains (losses) on available-for-sale assets |  |
Disclosure of analysis of other comprehensive income by item [line items] |  |
Accumulated other comprehensive income, beginning balance | 313 | (56)
Other comprehensiveincome (loss) | 319 | 369
Accumulated other comprehensive income, ending balance | 632 | 313
Unrealized gains (losses) on cash flow hedges |  |
Disclosure of analysis of other comprehensive income by item [line items] |  |
Accumulated other comprehensive income, beginning balance | (7) | (21)
Other comprehensiveincome (loss) | (6) | 14
Accumulated other comprehensive income, ending balance | (13) | (7)
Share of other comprehensive income (loss) in joint ventures and associates |  |
Disclosure of analysis of other comprehensive income by item [line items] |  |
Accumulated other comprehensive income, beginning balance | (33) | (24)
Other comprehensiveincome (loss) | (9) | (9)
Accumulated other comprehensive income, ending balance | (42) | (33)
Remeasurement of defined benefit plans |  |
Disclosure of analysis of other comprehensive income by item [line items] |  |
Accumulated other comprehensive income, beginning balance | (305) | (263)
Other comprehensiveincome (loss) | 22 | (42)
Accumulated other comprehensive income, ending balance | (283) | (305)
Revaluation surplus on transfers to investment properties |  |
Disclosure of analysis of other comprehensive income by item [line items] |  |
Accumulated other comprehensive income, beginning balance | 145 | 145
Other comprehensiveincome (loss) | 0 | 0
Accumulated other comprehensive income, ending balance | 145 | 145
Participating policyholders |  |
Disclosure of analysis of other comprehensive income by item [line items] |  |
Accumulated other comprehensive income, beginning balance | 11 | 14
Other comprehensiveincome (loss) | (6) | (3)
Accumulated other comprehensive income, ending balance | 5 | 11
Shareholders |  |
Disclosure of analysis of other comprehensive income by item [line items] |  |
Accumulated other comprehensive income, beginning balance | 1,461 | 1,690
Other comprehensiveincome (loss) | 128 | (229)
Accumulated other comprehensive income, ending balance | $ 1,589 | $ 1,461

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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 2019-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_55&doctype=Standard -URIDate 2019-03-27 + 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 IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 106 -Subparagraph d -Clause ii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_106_d_ii&doctype=Standard -URIDate 2019-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2019-01-01 -Paragraph B12 -Subparagraph b -Clause viii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2019-en-r&anchor=para_B12_b_viii&doctype=Appendix&subtype=B -URIDate 2019-03-27 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 81A -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_81A_b&doctype=Standard -URIDate 2019-03-27 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 91 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_91_a&doctype=Standard -URIDate 2019-03-27 + Details
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