Segregated funds - Summary of Changes in Net Assets (Detail) - CAD ($) $ in Millions |
Oct. 31, 2022 |
Oct. 31, 2021 |
Oct. 31, 2020 |
|---|---|---|---|
| Disclosure of segregated funds net assets [Line Items] | |||
| Segregated funds net assets | $ 2,638 | $ 2,666 | |
| Level 1 [member] | Segregated funds net assets [member] | |||
| Disclosure of segregated funds net assets [Line Items] | |||
| Cash | 39 | 40 | |
| Investment in mutual funds | 2,598 | 2,625 | |
| Other assets (liabilities) net | 1 | 1 | |
| Segregated funds net assets | $ 2,638 | $ 2,666 | $ 1,922 |