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Goodwill and Intangible Assets - Summary of Impairment Testing of Goodwill (Detail) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Disclosure of reconciliation of changes in goodwill [Line items]    
Goodwill Beginning balance $ 6,014 $ 5,651
Goodwill Net additions/ (disposals)   255
Effect of changes in foreign exchange rates (95) 108
Goodwill Ending balance 5,919 6,014
Asia Insurance, excluding Japan [member]    
Disclosure of reconciliation of changes in goodwill [Line items]    
Goodwill Beginning balance 162 152
Effect of changes in foreign exchange rates (3) 10
Goodwill Ending balance 159 162
Japan insurance [member]    
Disclosure of reconciliation of changes in goodwill [Line items]    
Goodwill Beginning balance 360 386
Effect of changes in foreign exchange rates (32) (26)
Goodwill Ending balance 328 360
Canadian insurance [member]    
Disclosure of reconciliation of changes in goodwill [Line items]    
Goodwill Beginning balance 1,960 1,955
Effect of changes in foreign exchange rates (2) 5
Goodwill Ending balance 1,958 1,960
US insurance [member]    
Disclosure of reconciliation of changes in goodwill [Line items]    
Goodwill Beginning balance 360 336
Effect of changes in foreign exchange rates (10) 24
Goodwill Ending balance 350 360
Asia wealth and asset management [member]    
Disclosure of reconciliation of changes in goodwill [Line items]    
Goodwill Beginning balance 450 183
Goodwill Net additions/ (disposals)   255
Effect of changes in foreign exchange rates (12) 12
Goodwill Ending balance 438 450
Canada wealth and asset management [member]    
Disclosure of reconciliation of changes in goodwill [Line items]    
Goodwill Beginning balance 1,436 1,436
Effect of changes in foreign exchange rates 0  
Goodwill Ending balance 1,436 1,436
US wealth and asset management [member]    
Disclosure of reconciliation of changes in goodwill [Line items]    
Goodwill Beginning balance 1,286 1,203
Effect of changes in foreign exchange rates (36) 83
Goodwill Ending balance $ 1,250 $ 1,286