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Goodwill and Intangible Assets - Summary of Carrying Amounts of Goodwill and Intangible Assets (Parenthetical) (Detail) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items]      
Intangible assets ending balance $ 4,233 $ 4,127 $ 4,223
Goodwill disposals 65    
Distribution networks [Member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items]      
Intangible assets ending balance 868 989 1,093
Intangible assets disposals 96    
Customer relationships [Member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items]      
Intangible assets ending balance 860 899 969
Software [Member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items]      
Intangible assets ending balance 821 661 494
Other [Member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items]      
Intangible assets ending balance 67 70 77
Fund management contracts and other [Member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items]      
Intangible assets ending balance 798 755 $ 785
US wealth and asset management [member] | Fund management contracts and other [Member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items]      
Intangible assets ending balance 400 367  
Canada wealth and asset management [member] | Fund management contracts and other [Member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items]      
Intangible assets ending balance 273 273  
U.S. [member] | Distribution networks [Member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items]      
Impairment 27    
Asia [member] | Distribution networks [Member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items]      
Impairment 13    
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 1,331 1,294  
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 1,145 1,128  
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 2,110 1,841  
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 $ 133 $ 126