v3.22.2.2
Loans and Allowance for Credit Losses - Reconciliation of Allowance for Credit Losses - Wholesale (Detail) - Wholesale [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 $ 1,797 $ 2,795
Provision for credit losses    
Model changes (17) 25
Originations 641 601
Maturities (784) (988)
Changes in risk, parameters and exposures 70 (198)
Write-offs (202) (253)
Recoveries 66 53
Exchange rate and other 3 (238)
Balance at end of period 1,574 1,797
Performing Stage one [member]    
Disclosure of credit risk exposure [line items]    
Balance at beginning of period 566 995
Provision for credit losses    
Model changes (14) 1
Transfers to Stage 1 415 581
Transfers to Stage 2 (78) (132)
Transfers to Stage 3 (3) (4)
Originations 641 601
Maturities (439) (488)
Changes in risk, parameters and exposures (504) (931)
Exchange rate and other 13 (57)
Balance at end of period 597 566
Performing Stage two [member]    
Disclosure of credit risk exposure [line items]    
Balance at beginning of period 794 1,132
Provision for credit losses    
Model changes (3) 24
Transfers to Stage 1 (411) (576)
Transfers to Stage 2 80 161
Transfers to Stage 3 (62) (60)
Maturities (345) (500)
Changes in risk, parameters and exposures 503 689
Exchange rate and other 29 (76)
Balance at end of period 585 794
Impaired Stage three [member]    
Disclosure of credit risk exposure [line items]    
Balance at beginning of period 437 668
Provision for credit losses    
Transfers to Stage 1 (4) (5)
Transfers to Stage 2 (2) (29)
Transfers to Stage 3 65 64
Changes in risk, parameters and exposures 71 44
Write-offs (202) (253)
Recoveries 66 53
Exchange rate and other (39) (105)
Balance at end of period $ 392 $ 437