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Goodwill and Intangible Assets - Summary of Impairment Testing of Goodwill (Detail) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Disclosure of reconciliation of changes in goodwill [Line items]    
Goodwill Beginning balance $ 5,651 $ 5,714
Goodwill Additions/ disposals 255 (5)
Effect of changes in foreign exchange rates 108 (58)
Goodwill Ending balance 6,014 5,651
Asia Insurance, excluding Japan [member]    
Disclosure of reconciliation of changes in goodwill [Line items]    
Goodwill Beginning balance 152 159
Goodwill Additions/ disposals   (5)
Effect of changes in foreign exchange rates 10 (2)
Goodwill Ending balance 162 152
Japan insurance [member]    
Disclosure of reconciliation of changes in goodwill [Line items]    
Goodwill Beginning balance 386 433
Effect of changes in foreign exchange rates (26) (47)
Goodwill Ending balance 360 386
Canadian insurance [member]    
Disclosure of reconciliation of changes in goodwill [Line items]    
Goodwill Beginning balance 1,955 1,955
Effect of changes in foreign exchange rates 5  
Goodwill Ending balance 1,960 1,955
US insurance [member]    
Disclosure of reconciliation of changes in goodwill [Line items]    
Goodwill Beginning balance 336 338
Effect of changes in foreign exchange rates 24 (2)
Goodwill Ending balance 360 336
Asia wealth and asset management [member]    
Disclosure of reconciliation of changes in goodwill [Line items]    
Goodwill Beginning balance 183 185
Goodwill Additions/ disposals 255  
Effect of changes in foreign exchange rates 12 (2)
Goodwill Ending balance 450 183
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 1,203 1,208
Effect of changes in foreign exchange rates 83 (5)
Goodwill Ending balance $ 1,286 $ 1,203