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Risk Management - Summary of Reconciliation of Allowance for Loan Losses (Detail) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Disclosure of credit risk exposure [Line Items]    
Beginning balance $ 107 $ 20
Provisions 26 125
Recoveries (74) (12)
Write-offs (15) (26)
Ending balance 44 107
Private placements [Member]    
Disclosure of credit risk exposure [Line Items]    
Beginning balance 79 4
Provisions 14 94
Recoveries (58) (6)
Write-offs (13) (13)
Ending balance 22 79
Mortgages and loans to Bank clients [Member]    
Disclosure of credit risk exposure [Line Items]    
Beginning balance 28 16
Provisions 12 31
Recoveries (16) (6)
Write-offs (2) (13)
Ending balance $ 22 $ 28