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Risk Management - Summary of Carrying Value of Past Due but not Impaired and Impaired Financial Assets (Detail)
$ in Millions
Dec. 31, 2022
CAD ($)
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
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
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
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
Impaired [Member]  
Disclosure of financial assets that are either past due or impaired [Line Items]  
Carrying value or impaired value, financial assets 313
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
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
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
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
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
AFS [Member] | Impaired [Member]  
Disclosure of financial assets that are either past due or impaired [Line Items]  
Carrying value or impaired value, financial assets 0
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
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
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
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
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
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
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] | 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 0
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
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
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 $ 0