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Segmented Information - Segment Results by Geographical Area (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disclosure of operating segments [line items]    
Revenue $ 39,679 $ 26,997
Asset Management    
Disclosure of operating segments [line items]    
Revenue 4,392 4,124
Asset Management | United States    
Disclosure of operating segments [line items]    
Revenue 4,139 3,945
Asset Management | United Kingdom    
Disclosure of operating segments [line items]    
Revenue 32 0
Asset Management | Canada    
Disclosure of operating segments [line items]    
Revenue 210 179
Asset Management | Other countries    
Disclosure of operating segments [line items]    
Revenue 11 0
Corporate    
Disclosure of operating segments [line items]    
Revenue 1,194 239
Corporate | United States    
Disclosure of operating segments [line items]    
Revenue 191 58
Corporate | United Kingdom    
Disclosure of operating segments [line items]    
Revenue 903 142
Corporate | Canada    
Disclosure of operating segments [line items]    
Revenue 93 38
Corporate | Other countries    
Disclosure of operating segments [line items]    
Revenue $ 7 $ 1