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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
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%

X

- Definition

Percentage of equity hedges in the dynamic program offset against hedged variable annuity liability.

+ References

No definition available.

+ Details

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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