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Risk Management - Summary of Carrying Value of Past Due but not Impaired and Impaired Financial Assets (Detail) - CAD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Financial assets past due but not impaired [Member]    
Disclosure of financial assets that are either past due or impaired [Line Items]    
Carrying value or impaired value, financial assets $ 204 $ 633
Financial assets past due but not impaired [Member] | Private placements [Member]    
Disclosure of financial assets that are either past due or impaired [Line Items]    
Carrying value or impaired value, financial assets 15 363
Financial assets past due but not impaired [Member] | Mortgages and loans to Bank clients [Member]    
Disclosure of financial assets that are either past due or impaired [Line Items]    
Carrying value or impaired value, financial assets 70 92
Financial assets past due but not impaired [Member] | Other financial assets [Member]    
Disclosure of financial assets that are either past due or impaired [Line Items]    
Carrying value or impaired value, financial assets 103 72
Impaired [Member]    
Disclosure of financial assets that are either past due or impaired [Line Items]    
Carrying value or impaired value, financial assets 179 173
Impaired [Member] | Private placements [Member]    
Disclosure of financial assets that are either past due or impaired [Line Items]    
Carrying value or impaired value, financial assets 18 40
Impaired [Member] | Mortgages and loans to Bank clients [Member]    
Disclosure of financial assets that are either past due or impaired [Line Items]    
Carrying value or impaired value, financial assets 120 86
Impaired [Member] | Other financial assets [Member]    
Disclosure of financial assets that are either past due or impaired [Line Items]    
Carrying value or impaired value, financial assets 1 1
FVTPL [Member] | Financial assets past due but not impaired [Member]    
Disclosure of financial assets that are either past due or impaired [Line Items]    
Carrying value or impaired value, financial assets 14  
FVTPL [Member] | Impaired [Member]    
Disclosure of financial assets that are either past due or impaired [Line Items]    
Carrying value or impaired value, financial assets 39 45
AFS [Member] | Financial assets past due but not impaired [Member]    
Disclosure of financial assets that are either past due or impaired [Line Items]    
Carrying value or impaired value, financial assets 2 106
AFS [Member] | Impaired [Member]    
Disclosure of financial assets that are either past due or impaired [Line Items]    
Carrying value or impaired value, financial assets 1 1
Less than 90 days [Member] | Financial assets past due but not impaired [Member]    
Disclosure of financial assets that are either past due or impaired [Line Items]    
Carrying value or impaired value, financial assets 176 589
Less than 90 days [Member] | Financial assets past due but not impaired [Member] | Private placements [Member]    
Disclosure of financial assets that are either past due or impaired [Line Items]    
Carrying value or impaired value, financial assets 15 363
Less than 90 days [Member] | Financial assets past due but not impaired [Member] | Mortgages and loans to Bank clients [Member]    
Disclosure of financial assets that are either past due or impaired [Line Items]    
Carrying value or impaired value, financial assets 70 76
Less than 90 days [Member] | Financial assets past due but not impaired [Member] | Other financial assets [Member]    
Disclosure of financial assets that are either past due or impaired [Line Items]    
Carrying value or impaired value, financial assets 77 46
Less than 90 days [Member] | FVTPL [Member] | Financial assets past due but not impaired [Member]    
Disclosure of financial assets that are either past due or impaired [Line Items]    
Carrying value or impaired value, financial assets 14  
Less than 90 days [Member] | AFS [Member] | Financial assets past due but not impaired [Member]    
Disclosure of financial assets that are either past due or impaired [Line Items]    
Carrying value or impaired value, financial assets   104
90 days and greater [Member] | Financial assets past due but not impaired [Member]    
Disclosure of financial assets that are either past due or impaired [Line Items]    
Carrying value or impaired value, financial assets 28 44
90 days and greater [Member] | Financial assets past due but not impaired [Member] | Mortgages and loans to Bank clients [Member]    
Disclosure of financial assets that are either past due or impaired [Line Items]    
Carrying value or impaired value, financial assets   16
90 days and greater [Member] | Financial assets past due but not impaired [Member] | Other financial assets [Member]    
Disclosure of financial assets that are either past due or impaired [Line Items]    
Carrying value or impaired value, financial assets 26 26
90 days and greater [Member] | AFS [Member] | Financial assets past due but not impaired [Member]    
Disclosure of financial assets that are either past due or impaired [Line Items]    
Carrying value or impaired value, financial assets $ 2 $ 2