Commitments, Guarantees and Pledged Assets - Summary of Future Minimum Lease Payments and Receipt for Operating Lease Commitments (Parenthetical) (Detail) - CAD ($) $ in Millions	12 Months Ended
Oct. 31, 2019	Oct. 31, 2018	Oct. 31, 2017
Buildings and equipment [member]
Disclosure of finance lease and operating lease by lessee [line items]
Total rental expense	$ 499	$ 494	$ 476

The amount of payments on leases and subleases recognised as an expense by the lessee.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Note Expiry date 2019-01-01
-Name IAS
-Number 17
-IssueDate 2018-01-01
-Paragraph 35
-Subparagraph c
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=17&date=2018-03-02&anchor=para_35_c&doctype=Standard&book=b
-URIDate 2018-03-16

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