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Segregated Funds - Summary of Composition of Segregated Funds Net Assets (Detail) - CAD
CAD in Millions
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of Composition Of Segregated Fund [line items]      
Total segregated funds net assets CAD 324,808 CAD 315,708 CAD 313,747
Composition of segregated funds net assets      
Held by policyholders 324,307 315,177  
Held by the Company 501 531  
Cash and short-term securities [Member]      
Disclosure of Composition Of Segregated Fund [line items]      
Total segregated funds net assets 4,756 4,524  
Debt securities [Member]      
Disclosure of Composition Of Segregated Fund [line items]      
Total segregated funds net assets 15,472 15,651  
Equity [Member]      
Disclosure of Composition Of Segregated Fund [line items]      
Total segregated funds net assets 12,624 12,458  
Mutual funds [Member]      
Disclosure of Composition Of Segregated Fund [line items]      
Total segregated funds net assets 288,007 278,966  
Other investments [Member]      
Disclosure of Composition Of Segregated Fund [line items]      
Total segregated funds net assets 4,514 4,552  
Accrued investment income [Member]      
Disclosure of Composition Of Segregated Fund [line items]      
Total segregated funds net assets 201 201  
Other assets and liabilities, net [Member]      
Disclosure of Composition Of Segregated Fund [line items]      
Total segregated funds net assets CAD (766) CAD (644)