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Interest income and expense - Summary of Consolidated Interest Income and Expense for Both Product and Accounting Category (Detail) - CAD ($) $ in Millions | 3 Months Ended
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Jan. 31, 2025 | Oct. 31, 2024 | Jan. 31, 2024
Analysis Of Income And Expense [line items] |  |  |  |
Interest income | [1] | $ 12,719 | $ 13,231 | $ 12,734
Interest expense |  | 8,918 | 9,598 | 9,485
Amortised cost [member] |  |  |  |
Analysis Of Income And Expense [line items] |  |  |  |
Interest income |  | 10,679 | 11,225 | 11,056
Interest expense |  | 8,270 | 8,990 | 8,938
Debt securities measured at fair value through other comprehensive income [member] |  |  |  |
Analysis Of Income And Expense [line items] |  |  |  |
Interest income |  | 862 | 961 | 867
Other [member] |  |  |  |
Analysis Of Income And Expense [line items] |  |  |  |
Interest income |  | 1,178 | 1,045 | 811
Interest expense |  | $ 648 | $ 608 | $ 547
[1] | Interest income included $11.5 billion for the quarter ended January 31, 2025 (October 31, 2024: $12.2 billion; January 31, 2024: $11.9 billion), calculated based on the effective interest rate method.

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- Definition The amount of expense arising from interest. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 8 -IssueDate 2024-01-01 -Paragraph 28 -Subparagraph e -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2024-en-r&anchor=para_28_e&doctype=Standard -URIDate 2024-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2024-01-01 -Paragraph B13 -Subparagraph f -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2024-en-r&anchor=para_B13_f&doctype=Appendix&subtype=B -URIDate 2024-03-27 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 8 -IssueDate 2024-01-01 -Paragraph 23 -Subparagraph d -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2024-en-r&anchor=para_23_d&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The amount of income arising from interest. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 8 -IssueDate 2024-01-01 -Paragraph 23 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2024-en-r&anchor=para_23_c&doctype=Standard -URIDate 2024-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 8 -IssueDate 2024-01-01 -Paragraph 28 -Subparagraph e -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2024-en-r&anchor=para_28_e&doctype=Standard -URIDate 2024-03-27 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2024-01-01 -Paragraph B13 -Subparagraph e -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2024-en-r&anchor=para_B13_e&doctype=Appendix&subtype=B -URIDate 2024-03-27 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 112 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_112_c&doctype=Standard -URIDate 2024-03-27 + Details
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