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Fair Value Measurement - Additional Information (Detail) - CAD ($) $ in Millions | 3 Months Ended | 6 Months Ended
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Apr. 30, 2025 | Jan. 31, 2025 | Apr. 30, 2024 | Apr. 30, 2025 | Apr. 30, 2024
Held for Trading for Trading Purpose [member] |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Transfers out of Level 1 into Level 2 of fair value hierarchy, assets held at end of reporting period | $ 1,989 | $ 457 |  |  |
Transfers out of Level 2 into Level 1 of fair value hierarchy, assets held at end of reporting period | 1,647 | 292 |  |  |
Obligations related to securities sold short [member] |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Transfers out of Level 1 into Level 2 of fair value hierarchy, assets held at end of reporting period | 1,764 | 307 |  |  |
Transfers out of Level 2 into Level 1 of fair value hierarchy, assets held at end of reporting period | 122 | 132 |  |  |
Level 3 of fair value hierarchy [member] |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Net gain (loss) net of hedges was realized for FVO assets and FVO liabilities | $ 20 | $ 32 | $ 7 | $ 52 | $ 0

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- Definition Net gains (losses) realized for FVO assets and FVO liabilities, net of hedges, included in the consolidated statement of income. + References No definition available. + Details
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- Definition The amount of transfers out of Level 1 and into Level 2 of the fair value hierarchy of assets held at the end of the reporting period. [Refer: Level 1 of fair value hierarchy [member]; Level 2 of fair value hierarchy [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 13 -IssueDate 2024-01-01 -Paragraph 93 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2024-en-r&anchor=para_93_c&doctype=Standard -URIDate 2024-03-27 + Details
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