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Concentration of Credit Risk - Summary of Credit Exposure Associated with our On- and Off-Balance Sheet Financial Instruments (Parenthetical) (Detail) - CAD ($) $ in Millions | 12 Months Ended
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Oct. 31, 2025 | Oct. 31, 2024
Disclosure of credit risk exposure [line items] |  |
Credit exposure | $ 1,095,621 | $ 1,022,941
Major assets [member] | Credit risk [member] | Real estate and construction [member] |  |
Disclosure of credit risk exposure [line items] |  |
Percentage of loans and acceptances net of allowance for credit losses accounted for | 10.00% | 10.00%
Financial guarantee contracts [member] | Credit risk [member] |  |
Disclosure of credit risk exposure [line items] |  |
Percentage of loans and acceptances net of allowance for credit losses accounted for | 10.00% | 8.00%
Mortgages [member] | Canada [member] | Credit risk [member] |  |
Disclosure of credit risk exposure [line items] |  |
Percentage of loans and acceptances net of allowance for credit losses accounted for | 48.00% | 49.00%
On-balance sheet [member] | United States [member] | Loans and Acceptances Net of Allowance for Credit Losses [member] | Credit risk [member] |  |
Disclosure of credit risk exposure [line items] |  |
Percentage of loans and acceptances net of allowance for credit losses accounted for | 17.00% | 15.00%
On-balance sheet [member] | Major assets [member] | Credit risk [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit exposure | $ 1,063,486 | $ 997,885
On-balance sheet [member] | Major assets [member] | United States [member] | Credit risk [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit exposure | 288,069 | 259,280
On-balance sheet [member] | Major assets [member] | Canada [member] | Credit risk [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit exposure | 657,015 | 627,621
On-balance sheet [member] | Major assets [member] | Canadian currency [member] | Credit risk [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit exposure | 630,800 | 596,400
On-balance sheet [member] | Major assets [member] | Foreign currency [member] | Credit risk [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit exposure | $ 432,700 | $ 401,500

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- Definition The amount that best represents the maximum exposure to credit risk without taking into account any collateral held or other credit enhancements (for example, netting agreements that do not qualify for offset in accordance with IAS 32). [Refer: Credit risk [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2024-01-01 -Paragraph 35K -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2024-en-r&anchor=para_35K_a&doctype=Standard -URIDate 2024-03-27 + Details
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