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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
	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

Percentage of total credit exposure represented by facilities.

+ References

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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table.

+ References

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+ Details

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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

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