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Risk Management - Sensitivity to Changes in Economic Assumptions (Details) - CAD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
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Risk Management [Abstract] |  |
Probability-weighted ECL | $ 828 | $ 929
Baseline ECL | 629 | 659
Difference - in amount | $ 199 | $ 270
Difference - in percentage | 24.03% | 29.06%

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- Definition Base line expected credit losses. + 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 Difference in the expected credit losses between the two methods. + References No definition available. + Details
Name: | mfc_DifferenceInTheExpectedCreditLossesBetweenTheTwoMethods
Namespace Prefix: | mfc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Estimated expected credit loss based on probability. + References No definition available. + Details
Name: | mfc_EstimatedExpectedCreditLossBasedOnProbability
Namespace Prefix: | mfc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Percentage difference in the expected credit losses between the two methods. + References No definition available. + Details
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Namespace Prefix: | mfc_
Data Type: | dtr-types1:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Risk Management [Abstract] + References No definition available. + Details
Name: | mfc_RiskManagementAbstract
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