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Fair Value of Financial Instruments - Additional Information (Detail) - CAD ($) $ in Millions	12 Months Ended
	Oct. 31, 2025	Oct. 31, 2024
Obligations relating to short selling of securities [member]
Disclosure of detailed information about financial instruments [line items]
Liabilities transferredout of level two into level one	$ 265	$ 396
Liabilities transferred out of level one into level two	268	6
Investment In Equity Securities [Member] | Level 2 of fair value hierarchy [member]
Disclosure of detailed information about financial instruments [line items]
Transferred out of level three into level two	0	0
Trading assets [member]
Disclosure of detailed information about financial instruments [line items]
Assets transferred out of level two into level one	620	1,867
Assets transferred out of level one into level two	914	712
Investment securities [Member]
Disclosure of detailed information about financial instruments [line items]
Assets transferred out of level two into level one	2,310	3,010
Assets transferred out of level one into level two	$ 1,532	$ 698

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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.

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The amount of transfers out of Level 1 and into Level 2 of the fair value hierarchy of assets held at the end of the reporting period. [Refer: Level 1 of fair value hierarchy [member]; Level 2 of fair value hierarchy [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-IssueDate 2024-01-01
-Paragraph 93
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The amount of transfers out of Level 1 and into Level 2 of the fair value hierarchy of liabilities held at the end of the reporting period. [Refer: Level 1 of fair value hierarchy [member]; Level 2 of fair value hierarchy [member]]

+ References

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The amount of transfers out of Level 2 and into Level 1 of the fair value hierarchy of assets held at the end of the reporting period. [Refer: Level 1 of fair value hierarchy [member]; Level 2 of fair value hierarchy [member]]

+ References

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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The amount of transfers of assets out of Level 3 of the fair value hierarchy. [Refer: Level 3 of fair value hierarchy [member]]

+ References

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