Commitments, Guarantees and Pledged Assets - Summary of Contract Amounts of Credit-Related Arrangements (Parenthetical) (Detail) - CAD ($) $ in Millions	Oct. 31, 2019	Oct. 31, 2018
Disclosure of commitments and contingencies [Line Items]
Cash collateral on securities lent	$ 1,822	$ 2,731
Personal, home equity, and credit card lines [member] \| Unutilized credit commitments [member]
Disclosure of commitments and contingencies [Line Items]
Capital commitment	$ 122,000	$ 116,500

The amount of future capital expenditures that the entity is committed to make.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2018-01-01
-Paragraph 112
-Subparagraph c
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_112_c&doctype=Standard
-URIDate 2018-03-16

Name:	ifrs-full_CapitalCommitments
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant