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Goodwill and Intangible Assets - Summary of Carrying Amounts of Goodwill and Intangible Assets (Parenthetical) (Detail) - CAD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items]      
Intangible assets ending balance $ 4,264 $ 4,215 $ 4,232
Distribution networks [Member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items]      
Intangible assets ending balance 888 806 801
Customer relationships [Member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items]      
Intangible assets ending balance 687 738 795
Software [Member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items]      
Intangible assets ending balance 1,091 1,059 991
Other [Member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items]      
Intangible assets ending balance 49 52 61
Fund management contracts and other [Member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items]      
Intangible assets ending balance 788 796 $ 805
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 273 273  
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 371 373  
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 1,456 1,332  
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 1,132 1,130  
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 2,484 2,310  
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 $ 124 $ 123