Cash and Deposits with Financial Institutions - Summary of Cash and Deposits with Financial Institutions (Parenthetical) (Detail) - CAD ($) $ in Millions |
Apr. 30, 2026 |
Jan. 31, 2026 |
Oct. 31, 2025 |
|---|---|---|---|
| Cash and Deposits with Financial Institutions [member] | |||
| Cash And Cash Equivalents And Short-term Deposits [line items] | |||
| Net of allowances | $ 3 | $ 3 | $ 4 |