NATURE OF THE BUSINESS (Details) $ in Millions	12 Months Ended
Dec. 31, 2020 CAD ($) segment
Corporate Information And Statement Of IFRS Compliance [Abstract]
Number of reportable segments \| segment	3
COVID-19 Pandemic
Unusual, Infrequent Items Or Both [Line Items]
Bad debt expense on accounts receivable, financing receivables, and contract assets based on changing economic conditions \| $	$ 90

The amount of additional allowance for credit losses of financial assets recognised in profit or loss. [Refer: Allowance account for credit losses of financial assets]

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Note Expiry date 2021-01-01
-Name IFRS
-Number 7
-IssueDate 2020-01-01
-Paragraph 16
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2017-en-b&anchor=para_16&doctype=Standard&book=b
-URIDate 2020-01-01

Name:	ifrs-full_AdditionalAllowanceRecognisedInProfitOrLossAllowanceAccountForCreditLossesOfFinancialAssets
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	duration