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Goodwill and Intangible Assets - Goodwill Allocated to CGUs (Details) - Goodwill - CAD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Goodwill $ 9,456 $ 8,969 $ 8,705
Canada      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Goodwill 2,747 2,748  
Dental      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Goodwill 2,479 2,283  
Group Benefits      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Goodwill 1,200 1,106  
SLC Management      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Goodwill 1,748 1,645  
MFS      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Goodwill 540 503  
Asia      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Goodwill $ 742 $ 684