v3.25.4
Goodwill and Intangible Assets - Goodwill Impairment Testing (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Disclosure of reconciliation of changes in goodwill [line items]    
Goodwill at beginning of period $ 6,275 $ 5,919
Net additions/(disposals) 739 150
Effect of changes in foreign exchange rates (137) 206
Goodwill at end of period 6,877 6,275
Asia Insurance (excluding Japan)    
Disclosure of reconciliation of changes in goodwill [line items]    
Goodwill at beginning of period 170 159
Net additions/(disposals) 0 0
Effect of changes in foreign exchange rates (4) 11
Goodwill at end of period 166 170
Japan Insurance    
Disclosure of reconciliation of changes in goodwill [line items]    
Goodwill at beginning of period 321 328
Net additions/(disposals) 0 0
Effect of changes in foreign exchange rates (14) (7)
Goodwill at end of period 307 321
Canada Insurance    
Disclosure of reconciliation of changes in goodwill [line items]    
Goodwill at beginning of period 1,966 1,958
Net additions/(disposals) 0 0
Effect of changes in foreign exchange rates (5) 8
Goodwill at end of period 1,961 1,966
U.S. Insurance    
Disclosure of reconciliation of changes in goodwill [line items]    
Goodwill at beginning of period 382 350
Net additions/(disposals) 0 0
Effect of changes in foreign exchange rates (18) 32
Goodwill at end of period 364 382
Asia WAM    
Disclosure of reconciliation of changes in goodwill [line items]    
Goodwill at beginning of period 479 438
Net additions/(disposals) 0 0
Effect of changes in foreign exchange rates (23) 41
Goodwill at end of period 456 479
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 1,521 1,250
Net additions/(disposals) 739 150
Effect of changes in foreign exchange rates (73) 121
Goodwill at end of period $ 2,187 $ 1,521