IFRS 7 Disclosures - Schedule of Maturity of Financial Liabilities (Parenthetical) (Detail) - CAD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Disclosure Of Maturity Analysis For Financial Liabilities [line items]
Carrying value of deposits from Bank clients	$ 20,889	$ 21,488
Level 2 [Member]
Disclosure Of Maturity Analysis For Financial Liabilities [line items]
Fair value of deposits from Bank clients	$ 21,085	$ 21,563

The amount of deposit liabilities from customers held by the entity.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2020-01-01
-Paragraph 55
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_55&doctype=Standard
-URIDate 2020-01-01

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