Securities - Schedule of Fair Value of Debt Securities Measured and Equity Securities Designated at FVOCI (Parenthetical) (Detail) - CAD ($) $ in Millions |
Jan. 31, 2023 |
Oct. 31, 2022 |
|---|---|---|
| Disclosure of financial assets [abstract] | ||
| Allowance for credit losses for debt securities measured at FVOCI | $ 23 | $ 24 |