Securities - Summary of Credit Risk Exposure by Internal Risk Rating (Parenthetical) (Detail) - CAD ($) $ in Millions |
Oct. 31, 2022 |
Oct. 31, 2021 |
|---|---|---|
| Purchased Credit Impaired [member] | ||
| Disclosure of credit risk exposure [line items] | ||
| Securities at Fair Value Through Other Comprehensive Income | $ 150 | $ 150 |