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Invested Assets and Investment Income - Summary of Total Investment Expenses (Detail) - CAD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Investment Expenses [line items] |  |
Total investment expenses | $ 1,787 | $ 1,748
Related to invested assets [Member] |  |
Investment Expenses [line items] |  |
Total investment expenses | 649 | 617
Related to segregated, mutual and other funds [Member] |  |
Investment Expenses [line items] |  |
Total investment expenses | $ 1,138 | $ 1,131

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- Definition Investment expense. + References No definition available. + Details
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Namespace Prefix: | mfc_
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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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