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Goodwill and Intangible Assets - Components of Intangible Assets (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Disclosure of detailed information about intangible assets [line items]    
Intangible assets $ 5,058 $ 5,174
MFS    
Disclosure of detailed information about intangible assets [line items]    
Impairment 290 272
SLC Management    
Disclosure of detailed information about intangible assets [line items]    
Impairment 931 916
Fund management contracts    
Disclosure of detailed information about intangible assets [line items]    
Intangible assets 1,235 1,194
Indefinite life    
Disclosure of detailed information about intangible assets [line items]    
Intangible assets 1,235 1,194
Total finite life intangible assets    
Disclosure of detailed information about intangible assets [line items]    
Intangible assets 3,823 3,980
Distribution, sales potential of field force    
Disclosure of detailed information about intangible assets [line items]    
Intangible assets 244 258
Client relationships and asset administration contracts    
Disclosure of detailed information about intangible assets [line items]    
Intangible assets 2,457 2,718
Internally generated software    
Disclosure of detailed information about intangible assets [line items]    
Intangible assets $ 1,122 $ 1,004