Loans and Allowance for Credit Losses - Disclosure of Allowance for Credit Losses (Parenthetical) (Detail) - CAD ($) $ in Millions |
12 Months Ended | |
|---|---|---|
Oct. 31, 2022 |
Oct. 31, 2021 |
|
| Disclosure of credit risk exposure [abstract] | ||
| Loan contractual amount outstanding on loans written-off during the period that are no longer subject to enforcement activity | $ 53 | $ 93 |