v3.26.1
Loans and Allowance for Credit Losses - Reconciliation of Allowance for Credit Losses - Small Business (Detail) - Retail [member] - Small business [member] - CAD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Jul. 31, 2026
Jul. 31, 2025
Jul. 31, 2026
Jul. 31, 2025
Disclosure of credit risk exposure [line items]        
Balance at beginning of period $ 329 $ 343 $ 351 $ 272
Provision for credit losses        
Originations 11 12 33 32
Maturities (9) (13) (52) (34)
Changes in risk, parameters and exposures 46 35 109 170
Write-offs (35) (31) (100) (91)
Recoveries 6 6 19 14
Exchange rate and other (7) (23) (18)
Balance at end of period 337 345 337 345
Performing Stage one [member]        
Disclosure of credit risk exposure [line items]        
Balance at beginning of period 97 98 95 80
Provision for credit losses        
Transfers to stage 1 18 14 53 37
Transfers to stage 2 (6) (6) (19) (17)
Transfers to stage 3     (1) (1)
Originations 11 12 33 32
Maturities (3) (6) (16) (16)
Changes in risk, parameters and exposures (18) (16) (48) (22)
Exchange rate and other     2 3
Balance at end of period 99 96 99 96
Performing Stage two [member]        
Disclosure of credit risk exposure [line items]        
Balance at beginning of period 116 114 117 86
Provision for credit losses        
Transfers to stage 1 (18) (14) (53) (37)
Transfers to stage 2 6 6 19 17
Transfers to stage 3 (5) (4) (16) (10)
Maturities (6) (7) (36) (18)
Changes in risk, parameters and exposures 25 16 85 73
Exchange rate and other (1) 2 1 2
Balance at end of period 117 113 117 113
Impaired Stage three [member]        
Disclosure of credit risk exposure [line items]        
Balance at beginning of period 116 131 139 106
Provision for credit losses        
Transfers to stage 3 5 4 17 11
Changes in risk, parameters and exposures 39 35 72 119
Write-offs (35) (31) (100) (91)
Recoveries 6 6 19 14
Exchange rate and other (10) (9) (26) (23)
Balance at end of period $ 121 $ 136 $ 121 $ 136