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IFRS 7 - Disclosure - Market Risk - Summary of Incremental Risk Charge (Detail) - CAD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Apr. 30, 2025 | Jan. 31, 2025 | Apr. 30, 2024 | Apr. 30, 2025 | Apr. 30, 2024
Market Risk [line items] |  |  |  |  |
Total VaR (one-day measure) | $ 10.6 | $ 11.1 | $ 15.0 |  |
Interest rate risk [member] |  |  |  |  |
Market Risk [line items] |  |  |  |  |
Total VaR (one-day measure) | 6.6 | 7.0 | 11.7 |  |
Credit spread risk [member] |  |  |  |  |
Market Risk [line items] |  |  |  |  |
Total VaR (one-day measure) | 1.4 | 1.3 | 2.4 |  |
Equity risk [member] |  |  |  |  |
Market Risk [line items] |  |  |  |  |
Total VaR (one-day measure) | 10.0 | 8.9 | 4.9 |  |
Foreign exchange risk [member] |  |  |  |  |
Market Risk [line items] |  |  |  |  |
Total VaR (one-day measure) | 1.1 | 1.3 | 2.7 |  |
Commodity risk [member] |  |  |  |  |
Market Risk [line items] |  |  |  |  |
Total VaR (one-day measure) | 2.3 | 5.9 | 3.1 |  |
Diversification effect [member] |  |  |  |  |
Market Risk [line items] |  |  |  |  |
Total VaR (one-day measure) | (10.8) | (13.3) | (9.8) |  |
High [Member] |  |  |  |  |
Market Risk [line items] |  |  |  |  |
Total VaR (one-day measure) | 16.1 |  |  |  |
High [Member] | Interest rate risk [member] |  |  |  |  |
Market Risk [line items] |  |  |  |  |
Total VaR (one-day measure) | 10.2 |  |  |  |
High [Member] | Credit spread risk [member] |  |  |  |  |
Market Risk [line items] |  |  |  |  |
Total VaR (one-day measure) | 2.9 |  |  |  |
High [Member] | Equity risk [member] |  |  |  |  |
Market Risk [line items] |  |  |  |  |
Total VaR (one-day measure) | 15.9 |  |  |  |
High [Member] | Foreign exchange risk [member] |  |  |  |  |
Market Risk [line items] |  |  |  |  |
Total VaR (one-day measure) | 3.0 |  |  |  |
High [Member] | Commodity risk [member] |  |  |  |  |
Market Risk [line items] |  |  |  |  |
Total VaR (one-day measure) | 9.0 |  |  |  |
Low [Member] |  |  |  |  |
Market Risk [line items] |  |  |  |  |
Total VaR (one-day measure) | 10.6 |  |  |  |
Low [Member] | Interest rate risk [member] |  |  |  |  |
Market Risk [line items] |  |  |  |  |
Total VaR (one-day measure) | 4.1 |  |  |  |
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) | 8.4 |  |  |  |
Low [Member] | Foreign exchange risk [member] |  |  |  |  |
Market Risk [line items] |  |  |  |  |
Total VaR (one-day measure) | 0.5 |  |  |  |
Low [Member] | Commodity risk [member] |  |  |  |  |
Market Risk [line items] |  |  |  |  |
Total VaR (one-day measure) | 2.0 |  |  |  |
Average risk [member] |  |  |  |  |
Market Risk [line items] |  |  |  |  |
Total VaR (one-day measure) | 13.8 | 10.9 | 13.0 | $ 12.3 | $ 11.2
Average risk [member] | Interest rate risk [member] |  |  |  |  |
Market Risk [line items] |  |  |  |  |
Total VaR (one-day measure) | 7.0 | 8.9 | 10.6 | 7.9 | 9.0
Average risk [member] | Credit spread risk [member] |  |  |  |  |
Market Risk [line items] |  |  |  |  |
Total VaR (one-day measure) | 1.6 | 2.1 | 2.4 | 1.9 | 2.4
Average risk [member] | Equity risk [member] |  |  |  |  |
Market Risk [line items] |  |  |  |  |
Total VaR (one-day measure) | 12.2 | 7.9 | 6.4 | 10.0 | 6.0
Average risk [member] | Foreign exchange risk [member] |  |  |  |  |
Market Risk [line items] |  |  |  |  |
Total VaR (one-day measure) | 1.1 | 1.6 | 1.5 | 1.3 | 1.2
Average risk [member] | Commodity risk [member] |  |  |  |  |
Market Risk [line items] |  |  |  |  |
Total VaR (one-day measure) | 5.0 | 2.8 | 2.4 | 3.9 | 2.5
Average risk [member] | Diversification effect [member] |  |  |  |  |
Market Risk [line items] |  |  |  |  |
Total VaR (one-day measure) | $ (13.1) | $ (12.4) | $ (10.3) | $ (12.7) | $ (9.9)

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