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Invested Assets and Investment Income - Summary of Securitized Assets and Secured Borrowing Liabilities (Parenthetical) (Detail) - CAD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
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Disclosure of securitized assets, mortgages and associated liabilities [line items] |  |
Secured borrowing liabilities | $ 5,556 | $ 5,023
Platinum Canadian Mortgage Trust II [Member] | Less than 1 year [Member] |  |
Disclosure of securitized assets, mortgages and associated liabilities [line items] |  |
Secured borrowing liabilities | 27 | 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 | 1,973 | 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 | 750 | 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 | $ 0 | $ 492

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