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Risk Management - Summary of Carrying Value of Past Due but not Impaired and Impaired Financial Assets (Parenthetical) (Detail) - CAD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
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Later than two months and not later than three months [member] |  |
Disclosure of financial assets that are either past due or impaired [line items] |  |
Financial assets past due payments delayed | $ 12 | $ 0
Financial assets past due | 3,297 | 20
Later than three months [member] |  |
Disclosure of financial assets that are either past due or impaired [line items] |  |
Financial assets past due payments delayed | 4 | 0
Financial assets past due | $ 224 | $ 0

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

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- Definition Financial assets past due. + References No definition available. + Details
Name: | mfc_FinancialAssetsPastDue
Namespace Prefix: | mfc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Financial assets past due payments delayed. + References No definition available. + Details
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Namespace Prefix: | mfc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

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- Details
Name: | ifrs-full_PastDueStatusAxis=ifrs-full_LaterThanThreeMonthsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |