Derivative Financial Instruments - Summary of Credit Exposure of Derivative Financial Instruments (Parenthetical) (Detail) - CAD ($) $ in Millions	Oct. 31, 2021	Oct. 31, 2020
CRA [member]
Disclosure of financial assets [line items]
Amounts relating to netting and collateral	$ 28,961	$ 32,081
CEA [member]
Disclosure of financial assets [line items]
Amounts relating to netting and collateral	$ 67,487	$ 66,686

The amounts that are subject to an enforceable master netting arrangement or similar agreement and that are not set off against financial assets. [Refer: Financial assets]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2020-01-01
-Paragraph 13C
-Subparagraph d
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2020-en-r&anchor=para_13C_d&doctype=Standard
-URIDate 2020-01-01

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