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Goodwill and Intangible Assets - Summary of Carrying Amounts of Goodwill and Intangible Assets (Parenthetical) (Detail) - CAD
CAD in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items]      
Intangible assets ending balance CAD 4,127 CAD 4,223 CAD 3,699
Additions of goodwill   256  
Additions of intangible assets 306 840  
John Hancock Investments and Retirement Plan Services [Member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items]      
Additions of goodwill   3  
Fund management contracts and other [Member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items]      
Intangible assets ending balance 755 785 723
Additions of intangible assets   76  
Fund management contracts and other [Member] | John Hancock Investments and Retirement Plan Services [Member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items]      
Intangible assets ending balance 367 393  
Fund management contracts and other [Member] | Canadian Wealth (excluding Manulife Bank of Canada) [Member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items]      
Intangible assets ending balance 273 273  
Distribution networks [Member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items]      
Intangible assets ending balance 989 1,093 726
Additions of intangible assets   450  
Distribution networks [Member] | U.S [Member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items]      
Impairments of intangible assets 150    
Customer relationships [Member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items]      
Intangible assets ending balance 899 969 947
Additions of intangible assets   79  
Software [Member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items]      
Intangible assets ending balance 661 494 396
Additions of intangible assets 306 229  
Other [Member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items]      
Intangible assets ending balance 70 77 CAD 76
Additions of intangible assets   6  
Standard Chartered's MPF [Member] | Distribution networks [Member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items]      
Additions of goodwill 194    
Additions of intangible assets 193    
Transamerica's broker - dealer business [Member] | Distribution networks [Member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items]      
Additions of goodwill 59    
Additions of intangible assets 26    
DBS Bank Ltd [Member] | Distribution networks [Member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items]      
Network intangible recognized 536    
Gross Carrying Value [Member] | Distribution networks [Member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items]      
Gross carrying amount of finite life intangible assets 1,294 1,363  
Gross Carrying Value [Member] | Customer relationships [Member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items]      
Gross carrying amount of finite life intangible assets 1,128 1,142  
Gross Carrying Value [Member] | Software [Member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items]      
Gross carrying amount of finite life intangible assets 1,841 1,581  
Gross Carrying Value [Member] | Other [Member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items]      
Gross carrying amount of finite life intangible assets CAD 126 CAD 133