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Invested Assets and Investment Income - Summary of Securitized Assets and Secured Borrowing Liabilities (Detail) - CAD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
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Disclosure of securitized assets, mortgages and associated liabilities [line items] |  |
Securitised Assets | $ 5,242 | $ 4,694
SecuredBorrowingLiabilities | 5,023 | 4,598
HELOC securitization [Member] |  |
Disclosure of securitized assets, mortgages and associated liabilities [line items] |  |
Securitised Assets | 2,924 | 2,619
SecuredBorrowingLiabilities | 2,750 |
CMB securitization [member] |  |
Disclosure of securitized assets, mortgages and associated liabilities [line items] |  |
Securitised Assets | 2,318 | 2,075
SecuredBorrowingLiabilities | 2,273 |
Securitized mortgages [Member] |  |
Disclosure of securitized assets, mortgages and associated liabilities [line items] |  |
Securitised Assets | 5,198 | 4,693
Securitized mortgages [Member] | HELOC securitization [Member] |  |
Disclosure of securitized assets, mortgages and associated liabilities [line items] |  |
Securitised Assets | 2,880 | 2,618
Securitized mortgages [Member] | CMB securitization [member] |  |
Disclosure of securitized assets, mortgages and associated liabilities [line items] |  |
Securitised Assets | 2,318 | 2,075
Restricted cash and short-term securities [member] |  |
Disclosure of securitized assets, mortgages and associated liabilities [line items] |  |
Securitised Assets | 44 | 1
Restricted cash and short-term securities [member] | HELOC securitization [Member] |  |
Disclosure of securitized assets, mortgages and associated liabilities [line items] |  |
Securitised Assets | $ 44 | 1
HELOC securitization [Member] |  |
Disclosure of securitized assets, mortgages and associated liabilities [line items] |  |
SecuredBorrowingLiabilities |  | 2,500
CMB securitization [member] |  |
Disclosure of securitized assets, mortgages and associated liabilities [line items] |  |
SecuredBorrowingLiabilities |  | $ 2,098

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