Interest Rate Benchmark Reform - Schedule of Non-derivative Financial Assets and Financial Liabilities (Parenthetical) (Detail) $ in Millions	Oct. 31, 2021 CAD ($)
Bank Deposit Note [Member] \| Reset After December Thirty One Two Thousand And Thirty Six [Member]
Nonderivative Financial Assets And Financial Liabilities [Line Items]
Financial liabilities at fair value through profit or loss, designated upon initial recognition or subsequently	$ 750

The amount of financial liabilities at fair value through profit or loss that were designated as such upon initial recognition or subsequently. [Refer: At fair value [member]; Financial liabilities at fair value through profit or loss]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2020-01-01
-Paragraph 8
-Subparagraph e
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2020-en-r&anchor=para_8_e&doctype=Standard
-URIDate 2020-01-01

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