v3.22.2.2
Loans and Allowance for Credit Losses - Reconciliation of Allowance for Credit Losses - Credit Cards (Detail) - Retail [member] - Credit cards [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 $ 875 $ 1,246
Provision for credit losses    
Model changes (2)  
Originations 10 6
Maturities (34) (38)
Changes in risk, parameters and exposures 374 (40)
Write-offs (503) (460)
Recoveries 171 163
Exchange rate and other 2 (2)
Balance at end of period 893 875
Performing Stage one [member]    
Disclosure of credit risk exposure [line items]    
Balance at beginning of period 233 364
Provision for credit losses    
Model changes (2)  
Transfers to Stage 1 495 723
Transfers to Stage 2 (95) (105)
Transfers to Stage 3 (2) (4)
Originations 10 6
Maturities (5) (7)
Changes in risk, parameters and exposures (458) (742)
Exchange rate and other 1 (2)
Balance at end of period 177 233
Performing Stage two [member]    
Disclosure of credit risk exposure [line items]    
Balance at beginning of period 642 882
Provision for credit losses    
Transfers to Stage 1 (495) (723)
Transfers to Stage 2 95 105
Transfers to Stage 3 (325) (309)
Maturities (29) (31)
Changes in risk, parameters and exposures 826 719
Exchange rate and other 2 (1)
Balance at end of period 716 642
Impaired Stage three [member]    
Provision for credit losses    
Transfers to Stage 3 327 313
Changes in risk, parameters and exposures 6 (17)
Write-offs (503) (460)
Recoveries 171 163
Exchange rate and other $ (1) $ 1