Related Party Transactions - Additional Information (Detail) - CAD ($) |
12 Months Ended | |
|---|---|---|
Oct. 31, 2024 |
Oct. 31, 2023 |
|
| Key management personnel and directors and their close family members [member] | ||
| Disclosure of transactions between related parties [line items] | ||
| Loans to related parties | $ 16,000,000 | $ 18,000,000 |
| Provisions for doubtful debts related to outstanding balances of related party transaction | 0 | 0 |
| Guarantees or pledges given to related parties | 0 | 0 |
| Commitments given to related parties | 0 | 0 |
| Joint ventures and associates [member] | ||
| Disclosure of transactions between related parties [line items] | ||
| Loans to related parties | 184,000,000 | 217,000,000 |
| Provisions for doubtful debts related to outstanding balances of related party transaction | 0 | 0 |
| Guarantees or pledges given to related parties | 1,000,000 | 1,000,000 |
| Commitments given to related parties | 1,226,000,000 | 1,089,000,000 |
| Deposits from related parties | $ 58,000,000 | $ 77,000,000 |