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Segmented Information - Segment Assets and Liabilities by Geographical Area (Details) - CAD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Disclosure of operating segments [line items]    
Total general fund assets $ 168,765 $ 162,720
Investments for account of segregated fund holders 103,062 106,392
SLF Asset Management    
Disclosure of operating segments [line items]    
Total general fund assets 4,468 4,115
Investments for account of segregated fund holders 0 0
SLF Asset Management | United States    
Disclosure of operating segments [line items]    
Total general fund assets 4,147 3,750
SLF Asset Management | United Kingdom    
Disclosure of operating segments [line items]    
Total general fund assets 0 0
Investments for account of segregated fund holders 0 0
SLF Asset Management | Canada    
Disclosure of operating segments [line items]    
Total general fund assets 321 365
SLF Asset Management | Other countries    
Disclosure of operating segments [line items]    
Total general fund assets 0 0
Corporate    
Disclosure of operating segments [line items]    
Total general fund assets 14,378 14,605
Investments for account of segregated fund holders 10,513 11,986
Corporate | United States    
Disclosure of operating segments [line items]    
Total general fund assets 2,550 1,984
Corporate | United Kingdom    
Disclosure of operating segments [line items]    
Total general fund assets 8,274 8,744
Investments for account of segregated fund holders 10,513 11,986
Corporate | Canada    
Disclosure of operating segments [line items]    
Total general fund assets 3,384 3,723
Corporate | Other countries    
Disclosure of operating segments [line items]    
Total general fund assets $ 170 $ 154