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Insurance Contract Liabilities and Reinsurance Assets - Summary of Potential Impact on Net Income Attributed to Shareholders Arising From Changes to Non-economic Assumptions (Detail) - CAD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
2% Adverse change in future mortality rates [Member] | Products where an increase in rates increases insurance contract liabilities [Member]    
Disclosure of sensitivity analysis for actuarial assumptions [Line Items]    
Decrease in net income attributed to shareholders $ (500) $ (400)
2% Adverse change in future mortality rates [Member] | Products where a decrease in rates increases insurance contract liabilities [Member]    
Disclosure of sensitivity analysis for actuarial assumptions [Line Items]    
Decrease in net income attributed to shareholders (500) (500)
5% adverse change in future morbidity rates (incidence and termination) [Member] | Long term care [member]    
Disclosure of sensitivity analysis for actuarial assumptions [Line Items]    
Decrease in net income attributed to shareholders (4,800) (5,100)
10% Adverse change in future policy termination rates [Member] | Long term care [member]    
Disclosure of sensitivity analysis for actuarial assumptions [Line Items]    
Decrease in net income attributed to shareholders (2,200) (2,100)
5% increase in future expense levels [Member] | Long term care [member]    
Disclosure of sensitivity analysis for actuarial assumptions [Line Items]    
Decrease in net income attributed to shareholders $ (600) $ (500)