Loans and Allowance for Credit Losses - Summary of Gross Carrying Amount of Loans Measured at Amortized Cost (Parenthetical) (Detail) |
12 Months Ended | |
|---|---|---|
Oct. 31, 2022 |
Oct. 31, 2021 |
|
| Credit risk [member] | ||
| Disclosure of credit risk exposure [line items] | ||
| Percentage of credit impaired loans collateralized fully or partially | 88.00% | 86.00% |