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Goodwill and Intangible Assets - Goodwill Allocated to CGUs (Details) - Goodwill - CAD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Goodwill $ 8,969 $ 8,705 $ 6,517
Canada      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Goodwill 2,748 2,607  
Group Benefits      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Goodwill 1,106 1,132  
Dental      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Goodwill 2,283 2,232  
Asia      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Goodwill 684 700  
Asset Management, MFS      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Goodwill 503 513  
Asset Management, SLC Management      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Goodwill $ 1,645 $ 1,521