Land, Building and Equipment - Summary of Land, Buildings and Equipment (Parenthetical) (Detail) - CAD ($) $ in Millions	12 Months Ended
Oct. 31, 2019	Oct. 31, 2018
Disclosure of detailed information about property, plant and equipment [abstract]
Work-in-progress not subject to depreciation	$ 173	$ 152
Acquisitions through business combinations	$ 1	$ 0

The increase in property, plant and equipment resulting from acquisitions through business combinations. [Refer: Business combinations [member]; Property, plant and equipment]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 16
-IssueDate 2018-01-01
-Paragraph 73
-Subparagraph e
-Clause iii
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2018-03-01&anchor=para_73_e_iii&doctype=Standard
-URIDate 2018-03-16

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