DIRECT OPERATING COSTS - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Analysis of income and expense [abstract]
Inventories recognized as expense during the period	$ 3,531	$ 6,146	$ 9,640	$ 10,751

The amount of inventories recognised as an expense during the period. [Refer: Inventories]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 2
-IssueDate 2019-01-01
-Paragraph 36
-Subparagraph d
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=2&code=ifrs-tx-2019-en-r&anchor=para_36_d&doctype=Standard
-URIDate 2019-03-27

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