Related Party Transactions - Summary of Transaction With Joint Ventures and Associates (Detail) - Associates and joint ventures [member] - CAD ($) $ in Millions	12 Months Ended
Oct. 31, 2025	Oct. 31, 2024
Disclosure of transactions between related parties [line items]
Net income / (loss)	$ (21)	$ (15)
Loans	140	209
Deposits	282	253
Guarantees and commitments	$ 57	$ 46

Guarantees and commitments made by entity, related party transactions.

No definition available.

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- Definition

Transfers of profit (loss) in related party transactions.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
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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

No definition available.

+ Details

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- Definition

The amount of transfers under finance agreements from the entity in related party transactions, including loans and equity contributions in cash or in kind. [Refer: Total for all related parties [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Name IAS
-Number 24
-IssueDate 2024-01-01
-Paragraph 21
-Subparagraph g
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=24&code=ifrs-tx-2024-en-r&anchor=para_21_g&doctype=Standard
-URIDate 2024-03-27

+ Details

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- Definition

The amount of transfers under finance agreements to the entity in related party transactions, including loans and equity contributions in cash or in kind. [Refer: Total for all related parties [member]]

+ References

+ Details

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Period Type:	duration

- Details

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