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Segregated Funds (Details) - CAD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
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Segregated Funds [Abstract] |  |
Guarantees included in insurance contract liabilities | $ 1,886 | $ 2,675
Reinsured guarantees | $ 530 | $ 980

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- Definition Contract Liabilities, Reinsured Guarantees + References No definition available. + Details
Name: | mfc_ContractLiabilitiesReinsuredGuarantees
Namespace Prefix: | mfc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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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 Segregated Funds [Abstract] + References No definition available. + Details
Name: | mfc_SegregatedFundsAbstract
Namespace Prefix: | mfc_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration