v3.22.2.2
Loans and Allowance for Credit Losses - Disclosure of Allowance for Credit Losses (Detail) - CAD ($)
$ in Millions
 12 Months Ended
Oct. 31, 2022
Oct. 31, 2021
Customers' liability under acceptances [member]    
Disclosure of credit risk exposure [line items]    
Balance at beginning of period $ 75 $ 107
Provision for credit losses (30) (32)
Balance at end of period 45 75
Allowance for credit losses [member]    
Disclosure of credit risk exposure [line items]    
Balance at beginning of period 4,419 6,115
Provision for credit losses 497 (672)
Net write-offs (763) (794)
Exchange rate changes/other 28 (230)
Balance at end of period 4,181 4,419
Allowance for credit losses [member] | Allowance for Loan Losses [Member]    
Disclosure of credit risk exposure [line items]    
Balance at beginning of period 4,089 5,639
Balance at end of period 3,753 4,089
Allowance for credit losses [member] | Other Liabilities And Provisions [member]    
Disclosure of credit risk exposure [line items]    
Balance at beginning of period 241 363
Balance at end of period 378 241
Allowance for credit losses [member] | Customers' liability under acceptances [member]    
Disclosure of credit risk exposure [line items]    
Balance at beginning of period 75 107
Balance at end of period 45 75
Allowance for credit losses [member] | Other components of equity [member]    
Disclosure of credit risk exposure [line items]    
Balance at beginning of period 14 6
Balance at end of period 5 14
Retail [member] | Residential mortgages [member]    
Disclosure of credit risk exposure [line items]    
Balance at beginning of period 416 518
Provision for credit losses 27 (43)
Net write-offs (24) (27)
Exchange rate changes/other 13 (32)
Balance at end of period 432 416
Retail [member] | Personal [member]    
Disclosure of credit risk exposure [line items]    
Balance at beginning of period 1,079 1,309
Provision for credit losses 211 23
Net write-offs (248) (247)
Exchange rate changes/other 1 (6)
Balance at end of period 1,043 1,079
Retail [member] | Credit cards [member]    
Disclosure of credit risk exposure [line items]    
Balance at beginning of period 875 1,246
Provision for credit losses 348 (72)
Net write-offs (332) (297)
Exchange rate changes/other 2 (2)
Balance at end of period 893 875
Retail [member] | Small business [member]    
Disclosure of credit risk exposure [line items]    
Balance at beginning of period 177 140
Provision for credit losses 31 12
Net write-offs (23) (23)
Exchange rate changes/other 9 48
Balance at end of period 194 177
Wholesale [member]    
Disclosure of credit risk exposure [line items]    
Balance at beginning of period 1,797 2,795
Provision for credit losses (90) (560)
Net write-offs (136) (200)
Exchange rate changes/other 3 (238)
Balance at end of period $ 1,574 $ 1,797