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Insurance Contract Liabilities and Reinsurance Assets - Summary of Components of Gross and Net Insurance Contract Liabilities (Parenthetical) (Detail) - CAD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
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Disclosure of insurance contract liabilities and reinsurance assets [abstract] |  |
Reinsurance assets for investment contract liabilities | $ 38 | $ 48

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- Definition The amount of reinsurance contracts held that are liabilities. [Refer: Liabilities; Reinsurance contracts held [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2023-01-01 -Name IFRS -Number 17 -IssueDate 2022-03-24 -Paragraph 78 -Subparagraph d -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=17&code=ifrs-tx-2022-en-r&anchor=para_78_d&doctype=Standard -URIDate 2022-03-24 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2023-01-01 -Name IAS -Number 1 -IssueDate 2022-03-24 -Paragraph 54 -Subparagraph ma -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2022-en-r&anchor=para_54_ma&doctype=Standard -URIDate 2022-03-24 + Details
Name: | ifrs-full_ReinsuranceContractsHeldThatAreLiabilities
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Disclosure of insurance contract liabilities and reinsurance assets abstract. + References No definition available. + Details
Name: | mfc_DisclosureOfInsuranceContractLiabilitiesAndReinsuranceAssetsAbstract
Namespace Prefix: | mfc_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration