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Segregated Funds - Summary of Composition of Segregated Funds Net Assets (Detail) - CAD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
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Disclosure of Composition Of Segregated Fund [line items] |  |  |
Total segregated funds net assets | $ 367,809 | $ 343,477 | $ 313,596
Composition of segregated funds net assets |  |  |
Held by policyholders | 367,436 | 343,108 |
Held by the Company | 373 | 369 |
Cash and short-term securities [Member] |  |  |
Disclosure of Composition Of Segregated Fund [line items] |  |  |
Total segregated funds net assets | 4,054 | 3,364 |
Debt securities [Member] |  |  |
Disclosure of Composition Of Segregated Fund [line items] |  |  |
Total segregated funds net assets | 17,913 | 16,883 |
Equity [Member] |  |  |
Disclosure of Composition Of Segregated Fund [line items] |  |  |
Total segregated funds net assets | 14,227 | 12,989 |
Mutual funds [Member] |  |  |
Disclosure of Composition Of Segregated Fund [line items] |  |  |
Total segregated funds net assets | 326,889 | 304,753 |
Other investments [Member] |  |  |
Disclosure of Composition Of Segregated Fund [line items] |  |  |
Total segregated funds net assets | 4,599 | 4,785 |
Accrued investment income [member] |  |  |
Disclosure of Composition Of Segregated Fund [line items] |  |  |
Total segregated funds net assets | 1,670 | 1,678 |
Other assets and liabilities, net [Member] |  |  |
Disclosure of Composition Of Segregated Fund [line items] |  |  |
Total segregated funds net assets | $ (1,543) | $ (975) |

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