Financial instruments - disclosures - Schedule of Balance Sheet Exposure Credit Risk under Different Basel Approaches (Parenthetical) (Detail) - CAD ($) $ in Millions	Oct. 31, 2025	Oct. 31, 2024
Disclosure of detailed information about financial instruments [line items]
Bank acceptance assets	$ 10	$ 6
Subject to credit risk [member]
Disclosure of detailed information about financial instruments [line items]
Bank acceptance assets	$ 10

The amount of bank acceptances recognised as assets.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2024-01-01
-Paragraph 55
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_55&doctype=Standard
-URIDate 2024-03-27

Name:	ifrs-full_BankAcceptanceAssets
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant