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Risk Management - Summary of Reconciliation of Allowance for Loan Losses (Detail) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disclosure of credit risk exposure [Line Items]    
Beginning balance $ 85 $ 118
Provisions 55 35
Recoveries (36) (13)
Write-offs (9) (55)
Ending balance 95 85
Private placements [Member]    
Disclosure of credit risk exposure [Line Items]    
Beginning balance 39 92
Provisions 37 2
Recoveries (27) (12)
Write-offs (6) (43)
Ending balance 43 39
Mortgages and loans to Bank clients [Member]    
Disclosure of credit risk exposure [Line Items]    
Beginning balance 46 26
Provisions 18 33
Recoveries (9) (1)
Write-offs (3) (12)
Ending balance $ 52 $ 46