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Risk Management - Summary of Carrying Value of Past Due but not Impaired and Impaired Financial Assets (Detail) - CAD
CAD in Millions
Dec. 31, 2017
Dec. 31, 2016
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 CAD 633 CAD 575
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 363 279
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 92 70
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 72 111
Impaired [Member]    
Disclosure of financial assets that are either past due or impaired [Line Items]    
Carrying value or impaired value, financial assets 173 231
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 40 152
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 86 33
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 8
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   90
FVTPL [Member] | Impaired [Member]    
Disclosure of financial assets that are either past due or impaired [Line Items]    
Carrying value or impaired value, financial assets 45 38
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 106 25
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 589 428
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 363 215
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 76 50
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 46 57
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   90
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 16
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 44 147
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   64
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 20
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 54
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 CAD 2 CAD 9