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Risk Management - Summary of the Effect of Unconditional Netting (Detail) - CAD
CAD in Millions
Dec. 31, 2017
Dec. 31, 2016
Disclosure of offsetting of financial liabilities [Line Items]    
Gross amounts of financial instruments CAD 8,877 CAD 15,350
Credit Linked Note [Member]    
Disclosure of offsetting of financial liabilities [Line Items]    
Gross amounts of financial instruments 461  
Amounts subject to an enforceable netting arrangement (461)  
Net amounts of financial instruments presented in the Consolidated Statements of Financial Position 0  
Variable Funding Surplus Note [Member]    
Disclosure of offsetting of financial liabilities [Line Items]    
Gross amounts of financial instruments (461)  
Amounts subject to an enforceable netting arrangement 461  
Net amounts of financial instruments presented in the Consolidated Statements of Financial Position CAD 0