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Risk Management - Summary of Reconciliation of Allowance for Loan Losses (Detail) - CAD
CAD in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Disclosure of credit risk exposure [Line Items]    
Beginning balance CAD 118 CAD 101
Provisions 35 126
Recoveries (13) (69)
Write-offs (55) (40)
Ending balance 85 118
Private placements [Member]    
Disclosure of credit risk exposure [Line Items]    
Beginning balance 92 72
Provisions 2 112
Recoveries (12) (62)
Write-offs (43) (30)
Ending balance 39 92
Mortgages and loans to Bank clients [Member]    
Disclosure of credit risk exposure [Line Items]    
Beginning balance 26 29
Provisions 33 14
Recoveries (1) (7)
Write-offs (12) (10)
Ending balance CAD 46 CAD 26