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Segregated Funds - Summary of Composition of Segregated Funds Net Assets (Detail) - CAD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
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Disclosure of Composition Of Segregated Fund [line items] |  |  |
Total segregated funds net assets | $ 348,933 | $ 400,196 | $ 367,809
Composition of segregated funds net assets |  |  |
Held by policyholders | 348,562 | 399,788 |
Held by the Company | 371 | 408 |
Cash and short-term securities [Member] |  |  |
Disclosure of Composition Of Segregated Fund [line items] |  |  |
Total segregated funds net assets | 4,280 | 3,955 |
Debt securities [Member] |  |  |
Disclosure of Composition Of Segregated Fund [line items] |  |  |
Total segregated funds net assets | 15,270 | 18,651 |
Equity [Member] |  |  |
Disclosure of Composition Of Segregated Fund [line items] |  |  |
Total segregated funds net assets | 15,499 | 16,844 |
Mutual funds [Member] |  |  |
Disclosure of Composition Of Segregated Fund [line items] |  |  |
Total segregated funds net assets | 308,707 | 354,882 |
Other investments [Member] |  |  |
Disclosure of Composition Of Segregated Fund [line items] |  |  |
Total segregated funds net assets | 4,293 | 4,613 |
Accrued investment income [member] |  |  |
Disclosure of Composition Of Segregated Fund [line items] |  |  |
Total segregated funds net assets | 1,680 | 2,340 |
Other assets and liabilities, net [Member] |  |  |
Disclosure of Composition Of Segregated Fund [line items] |  |  |
Total segregated funds net assets | $ (796) | $ (1,089) |

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