Investment Securities - Summary of Analysis of Fair Value and Carrying Value of Investment Securities Measured at Amortized Cost (Parenthetical) (Detail) - CAD ($) $ in Millions |
Apr. 30, 2026 |
Jan. 31, 2026 |
Oct. 31, 2025 |
|---|---|---|---|
| Debt securities [member] | |||
| Disclosure of financial assets [line items] | |||
| Allowance account for credit losses of financial assets | $ 2 | $ 1 | $ 1 |