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Invested Assets and Investment Income - Summary of Securitized Assets and Secured Borrowing Liabilities (Detail) - CAD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Disclosure of securitized assets, mortgages and associated liabilities [line items] |  |
Securitised assets | $ 5,812 | $ 5,242
Secured borrowing liabilities | 5,556 | 5,023
Net | 256 | 219
HELOC securitization [Member] |  |
Disclosure of securitized assets, mortgages and associated liabilities [line items] |  |
Securitised assets | 2,912 | 2,924
Secured borrowing liabilities | 2,750 |
Net | 162 | 174
CMB securitization [member] |  |
Disclosure of securitized assets, mortgages and associated liabilities [line items] |  |
Securitised assets | 2,900 | 2,318
Secured borrowing liabilities | 2,806 |
Net | 94 | 45
Securitized mortgages [Member] |  |
Disclosure of securitized assets, mortgages and associated liabilities [line items] |  |
Securitised assets | 5,780 | 5,198
Securitized mortgages [Member] | HELOC securitization [Member] |  |
Disclosure of securitized assets, mortgages and associated liabilities [line items] |  |
Securitised assets | 2,880 | 2,880
Securitized mortgages [Member] | CMB securitization [member] |  |
Disclosure of securitized assets, mortgages and associated liabilities [line items] |  |
Securitised assets | 2,900 | 2,318
Restricted cash and short-term securities [member] |  |
Disclosure of securitized assets, mortgages and associated liabilities [line items] |  |
Securitised assets | 32 | 44
Restricted cash and short-term securities [member] | HELOC securitization [Member] |  |
Disclosure of securitized assets, mortgages and associated liabilities [line items] |  |
Securitised assets | $ 32 | 44
HELOC securitization [Member] |  |
Disclosure of securitized assets, mortgages and associated liabilities [line items] |  |
Secured borrowing liabilities |  | 2,750
CMB securitization [member] |  |
Disclosure of securitized assets, mortgages and associated liabilities [line items] |  |
Secured borrowing liabilities |  | $ 2,273

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