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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 | 6 Months Ended
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Apr. 30, 2025 | Jan. 31, 2025 | Apr. 30, 2024 | Apr. 30, 2025 | Apr. 30, 2024
Analysis Of Income And Expense [line items] |  |  |  |  |  |
Interest income | [1] | $ 11,859 | $ 12,719 | $ 12,773 | $ 24,578 | $ 25,507
Interest expense |  | 8,071 | 8,918 | 9,492 | 16,989 | 18,977
Amortised cost [member] |  |  |  |  |  |
Analysis Of Income And Expense [line items] |  |  |  |  |  |
Interest income | [2],[3] | 9,977 | 10,679 | 11,032 | 20,656 | 22,088
Interest expense | [2],[3] | 7,403 | 8,270 | 8,974 | 15,673 | 17,912
Debt securities measured at fair value through other comprehensive income [member] |  |  |  |  |  |
Analysis Of Income And Expense [line items] |  |  |  |  |  |
Interest income | [3] | 756 | 862 | 905 | 1,618 | 1,772
Other [member] |  |  |  |  |  |
Analysis Of Income And Expense [line items] |  |  |  |  |  |
Interest income | [4] | 1,126 | 1,178 | 836 | 2,304 | 1,647
Interest expense | [4] | $ 668 | $ 648 | $ 518 | $ 1,316 | $ 1,065
[1] | Interest income included $10.7 billion for the quarter ended April 30, 2025 (January 31, 2025: $11.5 billion; April 30, 2024: $11.9 billion) and $22.3 billion for the six months ended April 30, 2025 (April 30, 2024: $23.9 billion), calculated based on the effective interest rate method.
[2] | Includes interest income on sublease-related assets and interest expense on lease liabilities under IFRS 16.
[3] | Interest income for financial instruments that are measured at amortized cost and debt securities that are measured at FVOCI is calculated using the effective interest rate method.
[4] | Includes interest income and expense and dividend income for financial instruments that are mandatorily measured and designated at FVTPL and equity securities designated at FVOCI.

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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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