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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
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