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Commitments, Guarantees and Pledged Assets - Summary of Contract Amounts of Credit-Related Arrangements (Detail) - CAD ($) $ in Millions | Oct. 31, 2025 | Oct. 31, 2024
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Disclosure of commitments and contingencies [Line Items] |  |
Credit related commitments | $ 480,883 | $ 440,411
Unutilized credit commitments [member] |  |
Disclosure of commitments and contingencies [Line Items] |  |
Credit related commitments | 420,442 | 383,882
Backstop liquidity facilities [member] |  |
Disclosure of commitments and contingencies [Line Items] |  |
Credit related commitments | 31,194 | 23,734
Standby and performance letters of credit [member] |  |
Disclosure of commitments and contingencies [Line Items] |  |
Credit related commitments | 26,358 | 22,181
Documentary and commercial letters of credit [member] |  |
Disclosure of commitments and contingencies [Line Items] |  |
Credit related commitments | 167 | 183
Other commitments to extend credit [Member] |  |
Disclosure of commitments and contingencies [Line Items] |  |
Credit related commitments | $ 2,722 | $ 10,431

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- Definition The amount of the exposure to credit risk on loan commitments and financial guarantee contracts. [Refer: Loan commitments [member]; Financial guarantee contracts [member]; Credit risk [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2024-01-01 -Paragraph 35H -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2024-en-r&anchor=para_35H&doctype=Standard -URIDate 2024-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2024-01-01 -Paragraph 35M -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2024-en-r&anchor=para_35M&doctype=Standard -URIDate 2024-03-27 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2024-01-01 -Paragraph 35I -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2024-en-r&anchor=para_35I&doctype=Standard -URIDate 2024-03-27 + Details
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