ACQUISITION OF BUSINESSES - Additional Information (Details) - USD ($) $ in Millions	Apr. 30, 2021	Mar. 30, 2020
Disclosure of detailed information about business combination [line items]
Percentage of voting interest in company		82.40%
Brazilian Regulated Gas Transmission Operation [Member]
Disclosure of detailed information about business combination [line items]
Proportion of ownership interest in subsidiary	3.00%
Percentage of voting interest in company	31.00%
Total consideration	$ 87
Gain (loss) recognised as result of remeasuring to fair value equity interest in acquiree held by acquirer before business combination	$ (32)
Brazilian Regulated Gas Transmission Operation [Member] \| Consortium
Disclosure of detailed information about business combination [line items]
Proportion of ownership interest in subsidiary	10.00%
Total consideration	$ 283

Percentage of voting interest in company

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- Definition

The fair value, at acquisition date, of the consideration transferred in a business combination. [Refer: Business combinations [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 3
-IssueDate 2020-01-01
-Paragraph B64
-Subparagraph f
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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

+ References

No definition available.

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- Definition

The gain (loss) recognised as result of remeasuring to fair value the equity interest in the acquiree held by the acquirer before the business combination. [Refer: Business combinations [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 3
-IssueDate 2020-01-01
-Paragraph B64
-Subparagraph p
-Clause ii
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- Definition

The proportion of ownership interest in a subsidiary attributable to the entity. [Refer: Subsidiaries [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 27
-IssueDate 2020-01-01
-Paragraph 17
-Subparagraph b
-Clause iii
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