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Segmented Information - Segment Results by Geographical Area (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of operating segments [line items]    
Revenue $ 43,337 $ 39,679
Asset Management    
Disclosure of operating segments [line items]    
Revenue 5,037 4,554
Asset Management | United States    
Disclosure of operating segments [line items]    
Revenue 4,505 4,185
Asset Management | United Kingdom    
Disclosure of operating segments [line items]    
Revenue 174 32
Asset Management | Canada    
Disclosure of operating segments [line items]    
Revenue 311 326
Asset Management | Other countries    
Disclosure of operating segments [line items]    
Revenue 47 11
Corporate    
Disclosure of operating segments [line items]    
Revenue 980 1,132
Corporate | United States    
Disclosure of operating segments [line items]    
Revenue 169 129
Corporate | United Kingdom    
Disclosure of operating segments [line items]    
Revenue 725 903
Corporate | Canada    
Disclosure of operating segments [line items]    
Revenue 79 93
Corporate | Other countries    
Disclosure of operating segments [line items]    
Revenue $ 7 $ 7