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Risk Management - Summary of Reconciliation of Allowance for Loan Losses (Detail) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Disclosure of credit risk exposure [Line Items]    
Beginning balance $ 44 $ 107
Provisions 26 26
Recoveries (20) (74)
Write-offs (3) (15)
Ending balance 47 44
Private placements [Member]    
Disclosure of credit risk exposure [Line Items]    
Beginning balance 22 79
Provisions 22 14
Recoveries (18) (58)
Write-offs (1) (13)
Ending balance 25 22
Mortgages and loans to Bank clients [Member]    
Disclosure of credit risk exposure [Line Items]    
Beginning balance 22 28
Provisions 4 12
Recoveries (2) (16)
Write-offs (2) (2)
Ending balance $ 22 $ 22