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Share Capital and Earnings Per Share - Summary of Reconciliation of Denominator (Number of Shares) in Calculation of Basic and Diluted Earnings Per Share (Parenthetical) (Detail) - shares shares in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Share based payments arrangements [Member] |  |
Earnings per share [Line Items] |  |
Anti-dilutive stock-based awards excluded from the calculation of EPS | 18 | 9

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Antidilutive securities with potential future dilutive effect not included in calculation of diluted earnings per share. + References No definition available. + Details
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Namespace Prefix: | mfc_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |