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Risk Management - Schedule of Potential Immediate Impact on Net Income Attributed to Shareholders Arising from Changes to Public Equity Returns (Parenthetical) (Detail) | Dec. 31, 2023 | Dec. 31, 2022
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Schedule of Potential Immediate Impact on Net Income Attributed to Shareholders by Changes to Public Equity Returns [line items] |  |
Percentage of equity hedges in the dynamic program offset against hedged variable annuity liability | 95.00% | 95.00%

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- Definition Percentage of equity hedges in the dynamic program offset against hedged variable annuity liability. + References No definition available. + Details
Name: | mfc_PercentageOfEquityHedgesInTheDynamicProgramOffsetAgainstHedgedVariableAnnuityLiability
Namespace Prefix: | mfc_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Schedule of potential immediate impact on net income attributed to shareholders arising from changes to public equity returns + References No definition available. + Details
Name: | mfc_ScheduleOfPotentialImmediateImpactOnNetIncomeAttributedToShareholdersByChangesToPublicEquityReturnsLineItems
Namespace Prefix: | mfc_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration