Premises and Equipment - Additional Information (Detail) - CAD ($) $ in Millions |
12 Months Ended | |
|---|---|---|
Oct. 31, 2022 |
Oct. 31, 2021 |
|
| Disclosure of detailed information about property, plant and equipment [line items] | ||
| Payments of lease liabilities, classified as financing activities | $ 629 | $ 621 |
| Variable Lease Payments | $ 578 | $ 613 |
| Percentage Of Variable Lease Payments To Lease Payments | 48.00% | 49.00% |
| Fixed Lease Payments | $ 635 | $ 646 |
| Variable lease payments excluded from the measurement of lease liabilities | $ 571 | $ 603 |
| Percentage Of Fixed Lease Payments To Lease Payments | 52.00% | 51.00% |
| Lease Payments [Member] | ||
| Disclosure of detailed information about property, plant and equipment [line items] | ||
| Payments of lease liabilities, classified as financing activities | $ 1,213 | $ 1,259 |