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IFRS 7 Disclosures - Schedule of Potential Immediate Impact on MLI's MCCSR Ratio Arising from Public Equity Returns Different than Expected Return for Policy Liability Valuation (Parenthetical) (Detail)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Potential Immediate Impact on MCCSR by Changes to Public Equity Returns [Abstract]
Interval percentage of which impact of rebalancing equity hedges for dynamically hedged variable annuity guarantee best estimate liabilities	5.00%	5.00%

X

- Definition

This percentage represents the interval size of which the impact of rebalancing equity hedges for dynamically hedged variable annuity guarantee best estimate liabilities.

+ References

No definition available.

+ Details

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Namespace Prefix:	mfc_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Potential immediate impact on MCCSR arising from changes to public equity returns.

+ References

No definition available.

+ Details

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