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Goodwill and Intangible Assets - Summary of Impairment Testing of Goodwill (Detail) - CAD
CAD in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Disclosure of reconciliation of changes in goodwill [Line items]    
Goodwill Beginning balance CAD 5,884 CAD 5,685
Goodwill Additions/ disposals   256
Effect of changes in foreign exchange rates (171) (57)
Goodwill Ending balance 5,713 5,884
Asia excluding Hong Kong and Japan [Member]    
Disclosure of reconciliation of changes in goodwill [Line items]    
Goodwill Beginning balance 160 166
Effect of changes in foreign exchange rates (6) (6)
Goodwill Ending balance 154 160
Hong Kong [Member]    
Disclosure of reconciliation of changes in goodwill [Line items]    
Goodwill Beginning balance 194  
Goodwill Additions/ disposals   194
Effect of changes in foreign exchange rates (14)  
Goodwill Ending balance 180 194
Japan Insurance and Wealth [Member]    
Disclosure of reconciliation of changes in goodwill [Line items]    
Goodwill Beginning balance 403 404
Effect of changes in foreign exchange rates (12) (1)
Goodwill Ending balance 391 403
Canadian Individual Life [Member]    
Disclosure of reconciliation of changes in goodwill [Line items]    
Goodwill Beginning balance 155 155
Goodwill Ending balance 155 155
Canadian Affinity Markets [Member]    
Disclosure of reconciliation of changes in goodwill [Line items]    
Goodwill Beginning balance 83 83
Goodwill Ending balance 83 83
Canadian Wealth (excluding Manulife Bank of Canada) [Member]    
Disclosure of reconciliation of changes in goodwill [Line items]    
Goodwill Beginning balance 1,085 1,085
Goodwill Ending balance 1,085 1,085
Canadian Group Benefits and Group Retirement Solutions [Member]    
Disclosure of reconciliation of changes in goodwill [Line items]    
Goodwill Beginning balance 1,773 1,773
Goodwill Ending balance 1,773 1,773
International Group Program [Member]    
Disclosure of reconciliation of changes in goodwill [Line items]    
Goodwill Beginning balance 90 93
Effect of changes in foreign exchange rates (6) (3)
Goodwill Ending balance 84 90
John Hancock Insurance [Member]    
Disclosure of reconciliation of changes in goodwill [Line items]    
Goodwill Beginning balance 428 378
Goodwill Additions/ disposals   59
Effect of changes in foreign exchange rates (28) (9)
Goodwill Ending balance 400 428
John Hancock Investments and Retirement Plan Services [Member]    
Disclosure of reconciliation of changes in goodwill [Line items]    
Goodwill Beginning balance 1,220 1,254
Goodwill Additions/ disposals   3
Effect of changes in foreign exchange rates (99) (37)
Goodwill Ending balance 1,121 1,220
Manulife Asset Management and Other [Member]    
Disclosure of reconciliation of changes in goodwill [Line items]    
Goodwill Beginning balance 293 294
Effect of changes in foreign exchange rates (6) (1)
Goodwill Ending balance CAD 287 CAD 293