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Segmented Information - Narrative (Details)
$ in Millions
Dec. 31, 2018
CAD ($)
segment
Mar. 31, 2018
CAD ($)
Dec. 31, 2017
CAD ($)
Disclosure of operating segments [line items]      
Insurance contract liabilities $ 121,923   $ 117,785
Number of operating segments | segment 5    
SLF U.S.      
Disclosure of operating segments [line items]      
Insurance contract liabilities $ 26,186   24,410
SLF Asia      
Disclosure of operating segments [line items]      
Insurance contract liabilities 21,525   20,257
Individual non-participating life and health      
Disclosure of operating segments [line items]      
Insurance contract liabilities 37,528   35,028
Individual non-participating life and health | SLF U.S.      
Disclosure of operating segments [line items]      
Insurance contract liabilities 13,239 $ (10,000) 12,024
Individual non-participating life and health | SLF Asia      
Disclosure of operating segments [line items]      
Insurance contract liabilities $ 12,463 $ 0 $ 11,449