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Goodwill and Intangible Assets - Goodwill Impairment Testing (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Disclosure of reconciliation of changes in goodwill [line items]    
Goodwill at beginning of period $ 5,919 $ 6,014
Net additions/(disposals) 150 0
Effect of changes in foreign exchange rates 206 (95)
Goodwill at end of period 6,275 5,919
Asia Insurance (excluding Japan)    
Disclosure of reconciliation of changes in goodwill [line items]    
Goodwill at beginning of period 159 162
Net additions/(disposals) 0 0
Effect of changes in foreign exchange rates 11 (3)
Goodwill at end of period 170 159
Japan Insurance    
Disclosure of reconciliation of changes in goodwill [line items]    
Goodwill at beginning of period 328 360
Net additions/(disposals) 0 0
Effect of changes in foreign exchange rates (7) (32)
Goodwill at end of period 321 328
Canada Insurance    
Disclosure of reconciliation of changes in goodwill [line items]    
Goodwill at beginning of period 1,958 1,960
Net additions/(disposals) 0 0
Effect of changes in foreign exchange rates 8 (2)
Goodwill at end of period 1,966 1,958
U.S. Insurance    
Disclosure of reconciliation of changes in goodwill [line items]    
Goodwill at beginning of period 350 360
Net additions/(disposals) 0 0
Effect of changes in foreign exchange rates 32 (10)
Goodwill at end of period 382 350
Asia WAM    
Disclosure of reconciliation of changes in goodwill [line items]    
Goodwill at beginning of period 438 450
Net additions/(disposals) 0 0
Effect of changes in foreign exchange rates 41 (12)
Goodwill at end of period 479 438
Canada WAM    
Disclosure of reconciliation of changes in goodwill [line items]    
Goodwill at beginning of period 1,436 1,436
Net additions/(disposals) 0 0
Effect of changes in foreign exchange rates 0 0
Goodwill at end of period 1,436 1,436
U.S. WAM    
Disclosure of reconciliation of changes in goodwill [line items]    
Goodwill at beginning of period 1,250 1,286
Net additions/(disposals) 150 0
Effect of changes in foreign exchange rates 121 (36)
Goodwill at end of period $ 1,521 $ 1,250