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Invested Assets and Investment Income - Summary of Securitized Assets and Secured Borrowing Liabilities (Detail) - CAD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Disclosure of securitized assets, mortgages and associated liabilities [line items]    
Securitised Assets $ 4,694 $ 4,629
SecuredBorrowingLiabilities 4,598 4,582
HELOC securitization [Member]    
Disclosure of securitized assets, mortgages and associated liabilities [line items]    
Securitised Assets 2,619 2,356
CMB securitization [member]    
Disclosure of securitized assets, mortgages and associated liabilities [line items]    
Securitised Assets 2,075 2,273
Securitized mortgages [Member]    
Disclosure of securitized assets, mortgages and associated liabilities [line items]    
Securitised Assets 4,693 4,629
Securitized mortgages [Member] | HELOC securitization [Member]    
Disclosure of securitized assets, mortgages and associated liabilities [line items]    
Securitised Assets 2,618 2,356
Securitized mortgages [Member] | CMB securitization [member]    
Disclosure of securitized assets, mortgages and associated liabilities [line items]    
Securitised Assets 2,075 2,273
Restricted cash and short-term securities [member]    
Disclosure of securitized assets, mortgages and associated liabilities [line items]    
Securitised Assets 1  
Restricted cash and short-term securities [member] | HELOC securitization [Member]    
Disclosure of securitized assets, mortgages and associated liabilities [line items]    
Securitised Assets 1  
HELOC securitization [Member]    
Disclosure of securitized assets, mortgages and associated liabilities [line items]    
SecuredBorrowingLiabilities 2,500 2,250
CMB securitization [member]    
Disclosure of securitized assets, mortgages and associated liabilities [line items]    
SecuredBorrowingLiabilities $ 2,098 $ 2,332