Related party transactions - Summary of Compensation of Key Management Personnel and Directors ( Parenthetical) (Detail) $ in Millions	12 Months Ended
Oct. 31, 2022 CAD ($)
Certain Executives Who Were Members Of The Banks Group [Member] \| Prior Year Stock Based Compensation Awards [Member]
Disclosure of transactions between related parties [line items]
Compensation granted to former executives benefits and share based payments	$ 14

The amount of compensation to key management personnel in the form of share-based payments. [Refer: Key management personnel of entity or parent [member]]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 24
-IssueDate 2021-01-01
-Paragraph 17
-Subparagraph e
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=24&code=ifrs-tx-2021-en-r&anchor=para_17_e&doctype=Standard
-URIDate 2021-03-24

Name:	ifrs-full_KeyManagementPersonnelCompensationSharebasedPayment
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration