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Risk Management - Summary of Company's Loans Considered Impaired (Detail) - Financial assets impaired loan [member] - CAD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Disclosure of financial assets that are either past due or impaired [Line Items]    
Net carrying value $ 138 $ 126
Private placements [Member]    
Disclosure of financial assets that are either past due or impaired [Line Items]    
Net carrying value 18 40
Mortgages and loans to Bank clients [Member]    
Disclosure of financial assets that are either past due or impaired [Line Items]    
Net carrying value 120 86
Gross Carrying Value [Member]    
Disclosure of financial assets that are either past due or impaired [Line Items]    
Net carrying value 233 211
Gross Carrying Value [Member] | Private placements [Member]    
Disclosure of financial assets that are either past due or impaired [Line Items]    
Net carrying value 61 79
Gross Carrying Value [Member] | Mortgages and loans to Bank clients [Member]    
Disclosure of financial assets that are either past due or impaired [Line Items]    
Net carrying value 172 132
Allowances for losses [Member]    
Disclosure of financial assets that are either past due or impaired [Line Items]    
Net carrying value 95 85
Allowances for losses [Member] | Private placements [Member]    
Disclosure of financial assets that are either past due or impaired [Line Items]    
Net carrying value 43 39
Allowances for losses [Member] | Mortgages and loans to Bank clients [Member]    
Disclosure of financial assets that are either past due or impaired [Line Items]    
Net carrying value $ 52 $ 46