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IFRS 7 - Disclosure - Market Risk - Summary of Incremental Risk Charge (Detail) - CAD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jul. 31, 2025 | Apr. 30, 2025 | Jul. 31, 2024 | Jul. 31, 2025 | Jul. 31, 2024
Market Risk [line items] |  |  |  |  |
Total VaR (one-day measure) | $ 9.8 | $ 10.6 | $ 10.7 |  |
Interest rate risk [member] |  |  |  |  |
Market Risk [line items] |  |  |  |  |
Total VaR (one-day measure) | 9.0 | 6.6 | 7.4 |  |
Credit spread risk [member] |  |  |  |  |
Market Risk [line items] |  |  |  |  |
Total VaR (one-day measure) | 1.3 | 1.4 | 2.6 |  |
Equity risk [member] |  |  |  |  |
Market Risk [line items] |  |  |  |  |
Total VaR (one-day measure) | 9.5 | 10.0 | 6.7 |  |
Foreign exchange risk [member] |  |  |  |  |
Market Risk [line items] |  |  |  |  |
Total VaR (one-day measure) | 0.8 | 1.1 | 0.8 |  |
Commodity risk [member] |  |  |  |  |
Market Risk [line items] |  |  |  |  |
Total VaR (one-day measure) | 2.5 | 2.3 | 3.3 |  |
Diversification effect [member] |  |  |  |  |
Market Risk [line items] |  |  |  |  |
Total VaR (one-day measure) | (13.3) | (10.8) | (10.1) |  |
High [Member] |  |  |  |  |
Market Risk [line items] |  |  |  |  |
Total VaR (one-day measure) | 15.0 |  |  |  |
High [Member] | Interest rate risk [member] |  |  |  |  |
Market Risk [line items] |  |  |  |  |
Total VaR (one-day measure) | 11.9 |  |  |  |
High [Member] | Credit spread risk [member] |  |  |  |  |
Market Risk [line items] |  |  |  |  |
Total VaR (one-day measure) | 2.0 |  |  |  |
High [Member] | Equity risk [member] |  |  |  |  |
Market Risk [line items] |  |  |  |  |
Total VaR (one-day measure) | 11.6 |  |  |  |
High [Member] | Foreign exchange risk [member] |  |  |  |  |
Market Risk [line items] |  |  |  |  |
Total VaR (one-day measure) | 2.8 |  |  |  |
High [Member] | Commodity risk [member] |  |  |  |  |
Market Risk [line items] |  |  |  |  |
Total VaR (one-day measure) | 3.2 |  |  |  |
Low [Member] |  |  |  |  |
Market Risk [line items] |  |  |  |  |
Total VaR (one-day measure) | 9.2 |  |  |  |
Low [Member] | Interest rate risk [member] |  |  |  |  |
Market Risk [line items] |  |  |  |  |
Total VaR (one-day measure) | 4.3 |  |  |  |
Low [Member] | Credit spread risk [member] |  |  |  |  |
Market Risk [line items] |  |  |  |  |
Total VaR (one-day measure) | 1.2 |  |  |  |
Low [Member] | Equity risk [member] |  |  |  |  |
Market Risk [line items] |  |  |  |  |
Total VaR (one-day measure) | 7.5 |  |  |  |
Low [Member] | Foreign exchange risk [member] |  |  |  |  |
Market Risk [line items] |  |  |  |  |
Total VaR (one-day measure) | 0.6 |  |  |  |
Low [Member] | Commodity risk [member] |  |  |  |  |
Market Risk [line items] |  |  |  |  |
Total VaR (one-day measure) | 1.5 |  |  |  |
Average risk [member] |  |  |  |  |
Market Risk [line items] |  |  |  |  |
Total VaR (one-day measure) | 11.2 | 13.8 | 13.1 | $ 11.9 | $ 11.8
Average risk [member] | Interest rate risk [member] |  |  |  |  |
Market Risk [line items] |  |  |  |  |
Total VaR (one-day measure) | 7.4 | 7.0 | 11.2 | 7.8 | 9.8
Average risk [member] | Credit spread risk [member] |  |  |  |  |
Market Risk [line items] |  |  |  |  |
Total VaR (one-day measure) | 1.6 | 1.6 | 2.8 | 1.8 | 2.5
Average risk [member] | Equity risk [member] |  |  |  |  |
Market Risk [line items] |  |  |  |  |
Total VaR (one-day measure) | 9.5 | 12.2 | 6.2 | 9.8 | 6.1
Average risk [member] | Foreign exchange risk [member] |  |  |  |  |
Market Risk [line items] |  |  |  |  |
Total VaR (one-day measure) | 1.0 | 1.1 | 1.4 | 1.2 | 1.3
Average risk [member] | Commodity risk [member] |  |  |  |  |
Market Risk [line items] |  |  |  |  |
Total VaR (one-day measure) | 2.3 | 5.0 | 3.3 | 3.4 | 2.8
Average risk [member] | Diversification effect [member] |  |  |  |  |
Market Risk [line items] |  |  |  |  |
Total VaR (one-day measure) | $ (10.6) | $ (13.1) | $ (11.8) | $ (12.1) | $ (10.7)

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