Securities - Summary of Securities (Parenthetical) (Detail) - CAD ($) $ in Millions	3 Months Ended
Jul. 31, 2024	Oct. 31, 2023
Disclosure of detailed information about financial instruments [line items]
Debt securities, available-for-sale, amortized cost	$ 0
Debt securities [member] \| Financial assets at amortised cost, category [member]
Disclosure of detailed information about financial instruments [line items]
Realized gain (loss) on disposal of debt securities	$ 0	$ 0

The gains (losses) on disposals of investments.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 1
-IssueDate 2023-01-01
-Paragraph 98
-Subparagraph d
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_98_d&doctype=Standard
-URIDate 2023-03-23

Name:	ifrs-full_GainsLossesOnDisposalsOfInvestments
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration