Loans, Impaired Loans and Allowance for Credit Losses - Additional Information (Detail) - CAD ($) $ in Millions |
3 Months Ended | 9 Months Ended | 12 Months Ended | ||
|---|---|---|---|---|---|
Jul. 31, 2026 |
Jul. 31, 2026 |
Apr. 30, 2026 |
Jul. 31, 2026 |
Oct. 31, 2025 |
|
| CANADA | |||||
| Disclosure of detailed information about financial instruments [line items] | |||||
| Percentage of imposed import tariffs by US | 7.50% | ||||
| Base case scenario [member] | |||||
| Disclosure of detailed information about financial instruments [line items] | |||||
| ACL (Stage 1 and Stage 2) | $ 5,040 | $ 4,936 | $ 5,313 | ||
| Base case scenario [member] | Previously stated [member] | |||||
| Disclosure of detailed information about financial instruments [line items] | |||||
| ACL (Stage 1 and Stage 2) | 4,726 | 4,644 | 5,018 | ||
| Pessimistic scenario [member] | |||||
| Disclosure of detailed information about financial instruments [line items] | |||||
| ACL (Stage 1 and Stage 2) | $ 649 | 591 | 786 | ||
| Probability Weighted Scenarios [Member] | |||||
| Disclosure of detailed information about financial instruments [line items] | |||||
| ACL (Stage 1 and Stage 2) | $ 800 | $ 807 | $ 801 | ||