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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, 2021
Dec. 31, 2020
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 $ 452 $ 210
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 63 30
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 61 66
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 308 114
Impaired [Member]    
Disclosure of financial assets that are either past due or impaired [Line Items]    
Carrying value or impaired value, financial assets 228 296
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 175 170
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 51 69
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   2
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 20  
FVTPL [Member] | Impaired [Member]    
Disclosure of financial assets that are either past due or impaired [Line Items]    
Carrying value or impaired value, financial assets 2 54
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
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 405 152
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 63 30
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 61 66
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 261 56
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 20  
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 47 58
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 $ 47 $ 58