Cash and Deposits with Financial Institutions - Additional Information (Detail) - CAD ($) $ in Millions	Oct. 31, 2021	Oct. 31, 2020
Mandatory Reserve Deposits At Central Banks [abstract]
Cash balances required to maintain with central banks, other regulatory authorities and certain counterparties	$ 5,719	$ 7,121

The amount of reserve that is kept in deposit at a central bank to fulfil regulatory reserve requirements.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2020-01-01
-Paragraph 112
-Subparagraph c
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_112_c&doctype=Standard
-URIDate 2020-01-01

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