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Adoption of IFRS 17 - Additional Information (Detail) - CAD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022
Disclosure of Detailed Information About Adoption of IFRS 17 [Line Items] |  |
Increase (decrease) in equity |  | $ 15,766
Contractual service margin liability |  | 21,466
Measurement of insurance contract liabilities effect of equity due to risk adjustments | $ 2,100 |
Measurement of insurance contract liabilities effect of equity due discount rates | 1,500 |
Measurement of insurance contract liabilities effect of equity due to other revaluation changes | $ 3,100 |
IFRS 17 [Member] |  |
Disclosure of Detailed Information About Adoption of IFRS 17 [Line Items] |  |
Increase (decrease) in equity |  | $ 11,997

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- Definition The increase (decrease) in equity. [Refer: Equity] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2023-01-01 -Paragraph 106 -Subparagraph d -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_106_d&doctype=Standard -URIDate 2023-03-23 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Contractual service margin liability. + References No definition available. + Details
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Namespace Prefix: | mfc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Disclosure of detailed information about adoption of ifrs 17. + References No definition available. + Details
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Data Type: | xbrli:stringItemType
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- Definition Measurement of insurance contract liabilities effect of equity due discount rates. + References No definition available. + Details
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Namespace Prefix: | mfc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Measurement of insurance contract liabilities' effect of equity due to other revaluation changes. + References No definition available. + Details
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Namespace Prefix: | mfc_
Data Type: | xbrli:monetaryItemType
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- Definition Measurement of insurance contract liabilities effect of equity due to risk adjustments. + References No definition available. + Details
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Namespace Prefix: | mfc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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