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NON-WHOLLY OWNED SUBSIDIARIES - Summarized Cash Flow Activities (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Disclosure of subsidiaries [line items] |  |  |
Operating | $ 839 | $ 730 | $ 1,083
Investing | 326 | (399) | (441)
Financing | (868) | (317) | (514)
Non-Wholly Owned Subsidiaries |  |  |
Disclosure of subsidiaries [line items] |  |  |
Operating | 1,041 | 875 | 1,110
Investing | 312 | (406) | (437)
Financing | (1,055) | (455) | (555)
U.K. regulated distribution operation |  |  |
Disclosure of subsidiaries [line items] |  |  |
Operating | 273 | 241 | 271
Investing | 344 | (372) | (416)
Financing | (582) | 133 | 147
Brazilian regulated gas transmission operation |  |  |
Disclosure of subsidiaries [line items] |  |  |
Operating | 768 | 634 | 839
Investing | (32) | (34) | (21)
Financing | $ (473) | $ (588) | $ (702)

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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 7 -IssueDate 2021-01-01 -Paragraph 10 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2021-en-r&anchor=para_10&doctype=Standard -URIDate 2021-03-24 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 7 -IssueDate 2021-01-01 -Paragraph 50 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2021-en-r&anchor=para_50_d&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 7 -IssueDate 2021-01-01 -Paragraph 10 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2021-en-r&anchor=para_10&doctype=Standard -URIDate 2021-03-24 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 7 -IssueDate 2021-01-01 -Paragraph 50 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2021-en-r&anchor=para_50_d&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition 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] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 7 -IssueDate 2021-01-01 -Paragraph 10 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2021-en-r&anchor=para_10&doctype=Standard -URIDate 2021-03-24 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 7 -IssueDate 2021-01-01 -Paragraph 50 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2021-en-r&anchor=para_50_d&doctype=Standard -URIDate 2021-03-24 + Details
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