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Goodwill and Intangible Assets - Summary of Impairment Testing of Goodwill (Detail) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disclosure of reconciliation of changes in goodwill [Line items]    
Goodwill Beginning balance $ 5,713 $ 5,884
Goodwill Additions/ disposals (65)  
Effect of changes in foreign exchange rates 216 (171)
Goodwill Ending balance 5,864 5,713
Asia Insurance, excluding Japan [member]    
Disclosure of reconciliation of changes in goodwill [Line items]    
Goodwill Beginning balance 154 160
Effect of changes in foreign exchange rates 11 (6)
Goodwill Ending balance 165 154
Japan insurance [member]    
Disclosure of reconciliation of changes in goodwill [Line items]    
Goodwill Beginning balance 391 403
Effect of changes in foreign exchange rates 44 (12)
Goodwill Ending balance 435 391
Canadian insurance [member]    
Disclosure of reconciliation of changes in goodwill [Line items]    
Goodwill Beginning balance 1,954 1,960
Effect of changes in foreign exchange rates 8 (6)
Goodwill Ending balance 1,962 1,954
US insurance [member]    
Disclosure of reconciliation of changes in goodwill [Line items]    
Goodwill Beginning balance 400 428
Goodwill Additions/ disposals (65)  
Effect of changes in foreign exchange rates 32 (28)
Goodwill Ending balance 367 400
Asia wealth and asset management [member]    
Disclosure of reconciliation of changes in goodwill [Line items]    
Goodwill Beginning balance 180 194
Effect of changes in foreign exchange rates 16 (14)
Goodwill Ending balance 196 180
Canada wealth and asset management [member]    
Disclosure of reconciliation of changes in goodwill [Line items]    
Goodwill Beginning balance 1,436 1,436
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 1,198 1,303
Effect of changes in foreign exchange rates 105 (105)
Goodwill Ending balance $ 1,303 $ 1,198