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Goodwill and Intangible Assets - Goodwill Allocated to CGUs (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2020
CAD ($)
Dec. 31, 2019
CAD ($)
Dec. 31, 2018
CAD ($)
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Goodwill impairment $ 0 $ 0  
Goodwill      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Goodwill 6,072 5,832 $ 5,412
SLF Canada      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Goodwill 2,607 2,607  
SLF US, Employee benefits group | Goodwill      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Goodwill 1,062 1,083  
SLF Asia | Goodwill      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Goodwill 665 676  
SLF Asset Management, MFS | Goodwill      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Goodwill 486 494  
SLF Asset Management, SLIM - excluding Infrared | Goodwill      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Goodwill 777 787  
InfraRed      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Goodwill 288    
Corporate, UK | Goodwill      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Goodwill $ 187 $ 185  
Bottom of range      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Price-to-earnings multiples used for valuation 10.5    
Price-to-assets-under-management multiples used for valuation 0.80%    
CGU discount rate 9.25%    
Top of range      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Price-to-earnings multiples used for valuation 11.5    
Price-to-assets-under-management multiples used for valuation 2.00%    
CGU discount rate 12.50%    
Income approach | Bottom of range      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Future sales projection for valuation, in years 10 years    
Income approach | Top of range      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Future sales projection for valuation, in years 15 years