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Invested Assets and Investment Income - Summary of Securitized Assets and Secured Borrowing Liabilities (Parenthetical) (Detail) - CAD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
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Disclosure of securitized assets, mortgages and associated liabilities [line items] |  |
Secured borrowing liabilities | $ 5,023 | $ 4,598
Platinum Canadian Mortgage Trust II [Member] | Less than 1 year [Member] |  |
Disclosure of securitized assets, mortgages and associated liabilities [line items] |  |
Secured borrowing liabilities | 0 |
Platinum Canadian Mortgage Trust II [Member] | 1 to 3 years [Member] |  |
Disclosure of securitized assets, mortgages and associated liabilities [line items] |  |
Secured borrowing liabilities | 1,209 |
Platinum Canadian Mortgage Trust II [Member] | 3 to 5 years [Member] |  |
Disclosure of securitized assets, mortgages and associated liabilities [line items] |  |
Secured borrowing liabilities | 1,049 |
Platinum Canadian Mortgage Trust II [Member] | Over 5 years [Member] |  |
Disclosure of securitized assets, mortgages and associated liabilities [line items] |  |
Secured borrowing liabilities | $ 492 |

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