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Risk Management - Summary of the Effect of Unconditional Netting (Detail) - CAD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Disclosure of offsetting of financial liabilities [Line Items]    
Gross amounts of financial instruments $ 8,780 $ 8,877
Credit Linked Note [member]    
Disclosure of offsetting of financial liabilities [Line Items]    
Gross amounts of financial instruments 679 461
Amounts subject to an enforceable netting arrangement (679) (461)
Net amounts of financial instruments presented in the Consolidated Statements of Financial Position 0 0
Variable Funding Surplus Note [member]    
Disclosure of offsetting of financial liabilities [Line Items]    
Gross amounts of financial instruments (679) (461)
Amounts subject to an enforceable netting arrangement 679 461
Net amounts of financial instruments presented in the Consolidated Statements of Financial Position $ 0 $ 0