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Segmented Information - Segment Results by Geographical Area (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disclosure of operating segments [line items]    
Revenue $ 26,997 $ 29,334
SLF Asset Management    
Disclosure of operating segments [line items]    
Revenue 4,124 4,082
SLF Asset Management | United States    
Disclosure of operating segments [line items]    
Revenue 3,945 3,961
SLF Asset Management | United Kingdom    
Disclosure of operating segments [line items]    
Revenue 0 0
SLF Asset Management | Canada    
Disclosure of operating segments [line items]    
Revenue 179 121
SLF Asset Management | Other countries    
Disclosure of operating segments [line items]    
Revenue 0 0
Corporate    
Disclosure of operating segments [line items]    
Revenue 239 752
Corporate | United States    
Disclosure of operating segments [line items]    
Revenue 58 147
Corporate | United Kingdom    
Disclosure of operating segments [line items]    
Revenue 142 577
Corporate | Canada    
Disclosure of operating segments [line items]    
Revenue 38 20
Corporate | Other countries    
Disclosure of operating segments [line items]    
Revenue $ 1 $ 8