Deposits and Subordinated Debt - Additional Information (Details) - CAD ($) $ in Millions |
3 Months Ended | 9 Months Ended | ||||
|---|---|---|---|---|---|---|
Jul. 22, 2026 |
Dec. 15, 2025 |
Jul. 31, 2026 |
Jul. 31, 2025 |
Jul. 31, 2026 |
Jul. 31, 2025 |
|
| Disclosure Of Deposits [Line Items] | ||||||
| Repayments of subordinated liabilities | $ 1,000 | $ 1,250 | $ 1,025 | $ 1,250 | ||
| Series K Medium-Term Notes, First Tranche | Subordinated Debt | ||||||
| Disclosure Of Deposits [Line Items] | ||||||
| Repayments of subordinated liabilities | $ 1,000 | |||||
| Borrowings, interest rate | 1.928% | |||||
| Percentage of redemption of principal amount plus unpaid accrued interest | 100.00% | |||||
| Debentures Series 20 | ||||||
| Disclosure Of Deposits [Line Items] | ||||||
| Repayments of subordinated liabilities | $ 25 | |||||
| Debentures Series 20 | Subordinated Debt | ||||||
| Disclosure Of Deposits [Line Items] | ||||||
| Notional amount | 150 | |||||
| Periodic payment, amount | $ 25 | |||||
| Periodic payment, period | 3 years | |||||