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Segmented Information - Narrative (Details)
$ in Millions
Dec. 31, 2019
CAD ($)
segment
Dec. 31, 2018
CAD ($)
Mar. 31, 2018
CAD ($)
Disclosure of operating segments [line items]      
Insurance contract liabilities $ 131,184 $ 121,923  
Number of operating segments | segment 5    
SLF U.S.      
Disclosure of operating segments [line items]      
Insurance contract liabilities $ 26,739 26,186  
SLF Asia      
Disclosure of operating segments [line items]      
Insurance contract liabilities 23,207 21,525  
Individual non-participating life and health      
Disclosure of operating segments [line items]      
Insurance contract liabilities 39,933 37,528  
Individual non-participating life and health | SLF U.S.      
Disclosure of operating segments [line items]      
Insurance contract liabilities 13,832 13,239  
Individual non-participating life and health | SLF Asia      
Disclosure of operating segments [line items]      
Insurance contract liabilities $ 12,188 $ 12,463 $ 0