Loans and Allowance for Credit Losses - Impact of Staging on Allowances for Credit Losses for Performing Loans (Detail) - CAD ($) $ in Millions |
12 Months Ended | |
|---|---|---|
Oct. 31, 2022 |
Oct. 31, 2021 |
|
| Disclosure Of Impact Of Staging On Allowance For Credit Losses on Performing Loans [Abstract] | ||
| ACL - All performing loans in Stage 1 | $ 2,373 | $ 2,521 |
| Impact of staging | 1,094 | 1,125 |
| Stage 1 and 2 ACL | $ 3,467 | $ 3,646 |