IFRS 7 Disclosure - Market Risk - Summary of Market Risk VaR and Market Risk SVaR (Parenthetical) (Detail) - Market Risk [Member] - CAD ($) $ in Millions |
Oct. 31, 2022 |
Oct. 31, 2021 |
|---|---|---|
| Disclosure of Market Risk VAR [Line Items] | ||
| Market risk VaR | $ 59 | $ 50 |
| Market risk Stressed VaR | 192 | 59 |
| Weighted average [member] | ||
| Disclosure of Market Risk VAR [Line Items] | ||
| Market risk VaR | 53 | 44 |
| Market risk Stressed VaR | 103 | 53 |
| Weighted average [member] | Loan underwriting commitments risk [member] | ||
| Disclosure of Market Risk VAR [Line Items] | ||
| Market risk VaR | 11 | 13 |
| Market risk Stressed VaR | $ 36 | $ 15 |