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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, 2022
Dec. 31, 2021
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 $ 3,694 $ 452
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 469 63
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 103 61
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 70 308
Impaired [Member]    
Disclosure of financial assets that are either past due or impaired [Line Items]    
Carrying value or impaired value, financial assets 313 228
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 229 175
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 74 51
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  
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 2,130 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 9 2
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 922  
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 3,437 405
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 317 63
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 103 61
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 36 261
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 2,059 20
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 922  
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 257 47
90 days and greater [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 152  
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 34 $ 47
90 days and greater [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 $ 71