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Commitments and Contingencies - Additional Information (Detail) - CAD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019 | Nov. 20, 2015 | Jun. 01, 2015
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Disclosure of commitments and contingencies [line items] |  |  |  |
Investment commitments outstanding | $ 0 | $ 8,682 |  |
Letters of credit outstanding | 103 | 57 |  |
Debt outstanding | 6,164 | 4,543 |  |
Variable Surplus Note [member] |  |  |  |
Disclosure of commitments and contingencies [line items] |  |  |  |
Debt outstanding | 0 | 0 |  |
The Manufacturers Life Insurance Company [Member] |  |  |  |
Disclosure of commitments and contingencies [line items] |  |  |  |
Subordinate guaranteed issued |  |  | $ 1,000 | $ 350
The Manufacturers Life Insurance Company [Member] | Subordinated debentures due on December 15, 2041 [Member] |  |  |  |
Disclosure of commitments and contingencies [line items] |  |  |  |
Guaranteed payment of amounts on subordinated debenture | 650 |  |  |
Mature in 30 Days [Member] |  |  |  |
Disclosure of commitments and contingencies [line items] |  |  |  |
Investment commitments outstanding | 0 | 411 |  |
Less than 1 year [Member] |  |  |  |
Disclosure of commitments and contingencies [line items] |  |  |  |
Investment commitments outstanding | 0 | 2,507 |  |
Debt outstanding | 0 | 649 |  |
Mature after One year [Member] |  |  |  |
Disclosure of commitments and contingencies [line items] |  |  |  |
Investment commitments outstanding | $ 0 | $ 5,764 |  |

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- Definition Subordinate guarantee issued. + References No definition available. + Details
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- Details
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- Details
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- Details
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- Details
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