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Accounting and Reporting Changes (Details) $ in Millions	12 Months Ended
	Dec. 31, 2024 CAD ($)
Accounting And Reporting Changes [Abstract]
Global minimum tax, expected payment	$ 231

X

- Definition

Accounting And Reporting Changes [Abstract]

+ References

No definition available.

+ Details

Name:	mfc_AccountingAndReportingChangesAbstract
Namespace Prefix:	mfc_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Global Minimum Tax, Expected Payment

+ References

No definition available.

+ Details

Name:	mfc_GlobalMinimumTaxExpectedPayment
Namespace Prefix:	mfc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration