v3.22.2.2
Loans and Allowance for Credit Losses - Reconciliation of Allowance for Credit Losses - Residential Mortgages (Detail) - Retail [member] - Residential mortgages [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 $ 416 $ 518
Provision for credit losses    
Model changes (11) (11)
Originations 159 113
Maturities (32) (54)
Changes in risk, parameters and exposures (89) (91)
Write-offs (38) (37)
Recoveries 14 10
Exchange rate and other 13 (32)
Balance at end of period 432 416
Performing Stage one [member]    
Disclosure of credit risk exposure [line items]    
Balance at beginning of period 186 206
Provision for credit losses    
Model changes (21) (6)
Transfers to Stage 1 113 205
Transfers to Stage 2 (14) (14)
Transfers to Stage 3 (2) (2)
Originations 159 113
Maturities (23) (30)
Changes in risk, parameters and exposures (167) (284)
Exchange rate and other 4 (2)
Balance at end of period 235 186
Performing Stage two [member]    
Disclosure of credit risk exposure [line items]    
Balance at beginning of period 92 160
Provision for credit losses    
Model changes 10 (5)
Transfers to Stage 1 (98) (182)
Transfers to Stage 2 23 18
Transfers to Stage 3 (25) (44)
Maturities (9) (24)
Changes in risk, parameters and exposures 68 178
Exchange rate and other 4 (9)
Balance at end of period 65 92
Impaired Stage three [member]    
Disclosure of credit risk exposure [line items]    
Balance at beginning of period 138 152
Provision for credit losses    
Transfers to Stage 1 (15) (23)
Transfers to Stage 2 (9) (4)
Transfers to Stage 3 27 46
Changes in risk, parameters and exposures 10 15
Write-offs (38) (37)
Recoveries 14 10
Exchange rate and other 5 (21)
Balance at end of period $ 132 $ 138