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Invested Assets and Investment Income - Summary of Carrying Amount of Securitized Assets and Secured Borrowing Liabilities (Detail) - CAD
CAD in Millions
Dec. 31, 2017
Dec. 31, 2016
Disclosure of securitized assets, mortgages and associated liabilities [Line Items]    
Securitised Assets CAD 3,512 CAD 2,788
Secured borrowing liabilities 3,523 2,782
HELOC securitization [Member]    
Disclosure of securitized assets, mortgages and associated liabilities [Line Items]    
Securitised Assets 2,032 1,770
CMB securitization [Member]    
Disclosure of securitized assets, mortgages and associated liabilities [Line Items]    
Securitised Assets 1,480 1,018
Securitized mortgages [Member]    
Disclosure of securitized assets, mortgages and associated liabilities [Line Items]    
Securitised Assets 3,504 2,780
Securitized mortgages [Member] | HELOC securitization [Member]    
Disclosure of securitized assets, mortgages and associated liabilities [Line Items]    
Securitised Assets 2,024 1,762
Securitized mortgages [Member] | CMB securitization [Member]    
Disclosure of securitized assets, mortgages and associated liabilities [Line Items]    
Securitised Assets 1,480 1,018
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]    
Secured borrowing liabilities 2,000 1,750
CMB securitization [Member]    
Disclosure of securitized assets, mortgages and associated liabilities [Line Items]    
Secured borrowing liabilities CAD 1,523 CAD 1,032