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IFRS 7 Disclosures - Summary of Potential Impact on Net Income Attributed to Shareholders Arising from Changes to Spreads (Parenthetical) (Detail) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Corporate spreads [member] |  |
Disclosure of Interest Rate and Spread Risk Sensitivities and Exposure Measures [line items] |  |
Spreads period assumed to grade to long-term average | 5 years | 5 years

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- Definition Disclosure of interest rate and spread risk sensitivities and exposure measures. + References No definition available. + Details
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Namespace Prefix: | mfc_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Spread Period to grade to long-term average. + References No definition available. + Details
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Namespace Prefix: | mfc_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | ifrs-full_ClassesOfAssetsAxis=mfc_CorporateSpreadsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |