v3.22.2.2
Loans and Allowance for Credit Losses - Reconciliation of Allowance for Credit Losses - Personal (Detail) - Retail [member] - Personal [member] - CAD ($)
$ in Millions
 12 Months Ended
Oct. 31, 2022
Oct. 31, 2021
Disclosure of credit risk exposure [line items]    
Balance at beginning of period $ 1,079 $ 1,309
Provision for credit losses    
Model changes (3) (1)
Originations 106 128
Maturities (169) (226)
Changes in risk, parameters and exposures 277 122
Write-offs (374) (387)
Recoveries 126 140
Exchange rate and other 1 (6)
Balance at end of period 1,043 1,079
Performing Stage one [member]    
Disclosure of credit risk exposure [line items]    
Balance at beginning of period 422 480
Provision for credit losses    
Model changes (3) (1)
Transfers to Stage 1 609 710
Transfers to Stage 2 (120) (97)
Transfers to Stage 3 (2) (3)
Originations 106 128
Maturities (70) (96)
Changes in risk, parameters and exposures (660) (697)
Exchange rate and other 3 (2)
Balance at end of period 285 422
Performing Stage two [member]    
Disclosure of credit risk exposure [line items]    
Balance at beginning of period 569 733
Provision for credit losses    
Transfers to Stage 1 (607) (706)
Transfers to Stage 2 121 97
Transfers to Stage 3 (47) (58)
Maturities (99) (130)
Changes in risk, parameters and exposures 724 633
Balance at end of period 661 569
Impaired Stage three [member]    
Disclosure of credit risk exposure [line items]    
Balance at beginning of period 88 96
Provision for credit losses    
Transfers to Stage 1 (2) (4)
Transfers to Stage 2 (1)  
Transfers to Stage 3 49 61
Changes in risk, parameters and exposures 213 186
Write-offs (374) (387)
Recoveries 126 140
Exchange rate and other (2) (4)
Balance at end of period $ 97 $ 88