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Segregated Funds - Additional Information (Detail) - CAD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
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Disclosure of subsidiaries [abstract] |  |
Guarantees included in insurance contract liabilities | $ 2,675 | $ 3,496
Guarantees reinsurance contracts | $ 980 | $ 1,249

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- References No definition available. + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Guarantees included in insurance contract liabilities. + References No definition available. + Details
Name: | mfc_GuaranteesIncludedInInsuranceContractLiabilities
Namespace Prefix: | mfc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Guarantees reinsurance contracts. + References No definition available. + Details
Name: | mfc_GuaranteesReinsuranceContracts
Namespace Prefix: | mfc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant