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Goodwill and Intangible Assets - Components of Intangible Assets (Details) - CAD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Disclosure of detailed information about intangible assets [line items]    
Intangible assets $ 1,779 $ 1,667
Fund management contracts    
Disclosure of detailed information about intangible assets [line items]    
Intangible assets 669 621
Indefinite life intangible assets    
Disclosure of detailed information about intangible assets [line items]    
Intangible assets 669 621
Distribution, sales potential of field force    
Disclosure of detailed information about intangible assets [line items]    
Intangible assets 366 376
Client relationships and asset administration contracts    
Disclosure of detailed information about intangible assets [line items]    
Intangible assets 439 429
Internally generated software    
Disclosure of detailed information about intangible assets [line items]    
Intangible assets 305 241
Total finite life intangible assets    
Disclosure of detailed information about intangible assets [line items]    
Intangible assets $ 1,110 $ 1,046