v3.22.2.2
Loans and Allowance for Credit Losses - Reconciliation of Allowance for Credit Losses - Small Business (Detail) - Retail [member] - Small business [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 $ 177 $ 140
Provision for credit losses    
Model changes   4
Originations 32 36
Maturities (46) (43)
Changes in risk, parameters and exposures 45 15
Write-offs (32) (32)
Recoveries 9 9
Exchange rate and other 9 48
Balance at end of period 194 177
Performing Stage one [member]    
Disclosure of credit risk exposure [line items]    
Balance at beginning of period 88 78
Provision for credit losses    
Model changes   3
Transfers to Stage 1 27 57
Transfers to Stage 2 (17) (11)
Transfers to Stage 3 (1) (1)
Originations 32 36
Maturities (22) (21)
Changes in risk, parameters and exposures (43) (77)
Exchange rate and other 9 24
Balance at end of period 73 88
Performing Stage two [member]    
Disclosure of credit risk exposure [line items]    
Balance at beginning of period 55 29
Provision for credit losses    
Model changes   1
Transfers to Stage 1 (27) (57)
Transfers to Stage 2 17 11
Transfers to Stage 3 (4) (2)
Maturities (24) (22)
Changes in risk, parameters and exposures 50 64
Exchange rate and other 6 31
Balance at end of period 73 55
Impaired Stage three [member]    
Disclosure of credit risk exposure [line items]    
Balance at beginning of period 34 33
Provision for credit losses    
Transfers to Stage 3 5 3
Changes in risk, parameters and exposures 38 28
Write-offs (32) (32)
Recoveries 9 9
Exchange rate and other (6) (7)
Balance at end of period $ 48 $ 34