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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