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IFRS 7 - Disclosure - Market Risk - Summary of Incremental Risk Charge (Detail) - CAD ($) $ in Millions | 3 Months Ended
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Jan. 31, 2025 | Oct. 31, 2024 | Jan. 31, 2024
Market Risk [line items] |  |  |
Total VaR (one-day measure) | $ 11.1 | $ 7.5 | $ 10.4
Interest rate risk [member] |  |  |
Market Risk [line items] |  |  |
Total VaR (one-day measure) | 7.0 | 6.3 | 7.5
Credit spread risk [member] |  |  |
Market Risk [line items] |  |  |
Total VaR (one-day measure) | 1.3 | 1.9 | 2.6
Equity risk [member] |  |  |
Market Risk [line items] |  |  |
Total VaR (one-day measure) | 8.9 | 6.9 | 5.2
Foreign exchange risk [member] |  |  |
Market Risk [line items] |  |  |
Total VaR (one-day measure) | 1.3 | 0.6 | 1.2
Commodity risk [member] |  |  |
Market Risk [line items] |  |  |
Total VaR (one-day measure) | 5.9 | 1.2 | 3.0
Diversification effect [member] |  |  |
Market Risk [line items] |  |  |
Total VaR (one-day measure) | (13.3) | (9.4) | (9.1)
High [Member] |  |  |
Market Risk [line items] |  |  |
Total VaR (one-day measure) | 13.6 |  |
High [Member] | Interest rate risk [member] |  |  |
Market Risk [line items] |  |  |
Total VaR (one-day measure) | 14.2 |  |
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) | 9.2 |  |
High [Member] | Foreign exchange risk [member] |  |  |
Market Risk [line items] |  |  |
Total VaR (one-day measure) | 3.6 |  |
High [Member] | Commodity risk [member] |  |  |
Market Risk [line items] |  |  |
Total VaR (one-day measure) | 6.0 |  |
Low [Member] |  |  |
Market Risk [line items] |  |  |
Total VaR (one-day measure) | 8.4 |  |
Low [Member] | Interest rate risk [member] |  |  |
Market Risk [line items] |  |  |
Total VaR (one-day measure) | 4.6 |  |
Low [Member] | Credit spread risk [member] |  |  |
Market Risk [line items] |  |  |
Total VaR (one-day measure) | 1.3 |  |
Low [Member] | Equity risk [member] |  |  |
Market Risk [line items] |  |  |
Total VaR (one-day measure) | 7.1 |  |
Low [Member] | Foreign exchange risk [member] |  |  |
Market Risk [line items] |  |  |
Total VaR (one-day measure) | 0.8 |  |
Low [Member] | Commodity risk [member] |  |  |
Market Risk [line items] |  |  |
Total VaR (one-day measure) | 1.1 |  |
Average risk [member] |  |  |
Market Risk [line items] |  |  |
Total VaR (one-day measure) | 10.9 | 8.5 | 9.3
Average risk [member] | Interest rate risk [member] |  |  |
Market Risk [line items] |  |  |
Total VaR (one-day measure) | 8.9 | 7.5 | 7.4
Average risk [member] | Credit spread risk [member] |  |  |
Market Risk [line items] |  |  |
Total VaR (one-day measure) | 2.1 | 2.2 | 2.4
Average risk [member] | Equity risk [member] |  |  |
Market Risk [line items] |  |  |
Total VaR (one-day measure) | 7.9 | 5.7 | 5.7
Average risk [member] | Foreign exchange risk [member] |  |  |
Market Risk [line items] |  |  |
Total VaR (one-day measure) | 1.6 | 1.2 | 0.9
Average risk [member] | Commodity risk [member] |  |  |
Market Risk [line items] |  |  |
Total VaR (one-day measure) | 2.8 | 2.9 | 2.7
Average risk [member] | Diversification effect [member] |  |  |
Market Risk [line items] |  |  |
Total VaR (one-day measure) | $ (12.4) | $ (11.0) | $ (9.8)

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