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IFRS 7 Disclosures - Summary of Potential Impact to MLI's LICAT Total Ratio Resulting from Changes in Public Equity Market Values (Parenthetical) (Detail) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Summary Of Detailed Information About Potential Impact To MliS Licat Total Ratio Resulting From Changes In Public Equity Market Values [Abstract] |  |
Interval percentage of which impact of rebalancing equity hedges for dynamically hedged variable annuity guarantee best estimate liabilities | 5.00% | 5.00%

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- 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

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- Definition Summary Of Of Detailed Information About Potential Impact To Mli'S Licat Total Ratio Resulting From Changes In Public Equity Market Values . + References No definition available. + Details
Name: | mfc_SummaryOfDetailedInformationAboutPotentialImpactToMlisLicatTotalRatioResultingFromChangesInPublicEquityMarketValuesAbstract
Namespace Prefix: | mfc_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration