NON-WHOLLY OWNED SUBSIDIARIES - Summarized Cash Flow Activities (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disclosure of subsidiaries [line items]
Operating	$ 730	$ 1,083	$ 1,065
Investing	(399)	(441)	(435)
Financing	(317)	(514)	(568)
Non-Wholly Owned Subsidiaries
Disclosure of subsidiaries [line items]
Operating	875	1,110	1,094
Investing	(406)	(437)	(439)
Financing	(455)	(555)	(613)
U.K. regulated distribution operation
Disclosure of subsidiaries [line items]
Operating	241	271	226
Investing	(372)	(416)	(413)
Financing	133	147	179
Brazilian regulated gas transmission operation
Disclosure of subsidiaries [line items]
Operating	634	839	868
Investing	(34)	(21)	(26)
Financing	$ (588)	$ (702)	$ (792)

The cash flows from (used in) financing activities, which are activities that result in changes in the size and composition of the contributed equity and borrowings of the entity.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 7
-IssueDate 2020-01-01
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 7
-IssueDate 2020-01-01
-Paragraph 50
-Subparagraph d
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-URIDate 2020-01-01

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The cash flows from (used in) investing activities, which are the acquisition and disposal of long-term assets and other investments not included in cash equivalents.

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The cash flows from (used in) operating activities, which are the principal revenue-producing activities of the entity and other activities that are not investing or financing activities. [Refer: Revenue]

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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.

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No definition available.

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