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Segmented Information - Segment Results by Geographical Area (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Disclosure of operating segments [line items]    
Total revenue $ 40,943 $ 5,769
Asset Management    
Disclosure of operating segments [line items]    
Total revenue 6,140 5,773
Asset Management | U.S.    
Disclosure of operating segments [line items]    
Total revenue 5,438 5,136
Asset Management | United Kingdom    
Disclosure of operating segments [line items]    
Total revenue 262 288
Asset Management | Canada    
Disclosure of operating segments [line items]    
Total revenue 327 304
Asset Management | Other countries    
Disclosure of operating segments [line items]    
Total revenue 113 45
Corporate    
Disclosure of operating segments [line items]    
Total revenue 538 (678)
Corporate | U.S.    
Disclosure of operating segments [line items]    
Total revenue 92 31
Corporate | United Kingdom    
Disclosure of operating segments [line items]    
Total revenue 259 (800)
Corporate | Canada    
Disclosure of operating segments [line items]    
Total revenue 57 (10)
Corporate | Other countries    
Disclosure of operating segments [line items]    
Total revenue $ 130 $ 101