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Invested Assets and Investment Income - Summary of Securitized Assets and Secured Borrowing Liabilities (Detail) - CAD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Disclosure of securitized assets, mortgages and associated liabilities [line items]    
Securitised Assets $ 3,818 $ 3,512
SecuredBorrowingLiabilities 3,774 3,523
HELOC securitization [Member]    
Disclosure of securitized assets, mortgages and associated liabilities [line items]    
Securitised Assets 2,293 2,032
CMB securitization [member]    
Disclosure of securitized assets, mortgages and associated liabilities [line items]    
Securitised Assets 1,525 1,480
Securitized mortgages [Member]    
Disclosure of securitized assets, mortgages and associated liabilities [line items]    
Securitised Assets 3,810 3,504
Securitized mortgages [Member] | HELOC securitization [Member]    
Disclosure of securitized assets, mortgages and associated liabilities [line items]    
Securitised Assets 2,285 2,024
Securitized mortgages [Member] | CMB securitization [member]    
Disclosure of securitized assets, mortgages and associated liabilities [line items]    
Securitised Assets 1,525 1,480
Restricted cash and short-term securities [member]    
Disclosure of securitized assets, mortgages and associated liabilities [line items]    
Securitised Assets 8 8
Restricted cash and short-term securities [member] | HELOC securitization [Member]    
Disclosure of securitized assets, mortgages and associated liabilities [line items]    
Securitised Assets 8 8
HELOC securitization [Member]    
Disclosure of securitized assets, mortgages and associated liabilities [line items]    
SecuredBorrowingLiabilities 2,250 2,000
CMB securitization [member]    
Disclosure of securitized assets, mortgages and associated liabilities [line items]    
SecuredBorrowingLiabilities $ 1,524 $ 1,523