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NON-WHOLLY OWNED SUBSIDIARIES - Summarized Statement of Operations (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure of subsidiaries [line items] |  |  |
Revenues | $ 1,430 | $ 1,619 | $ 1,561
Non-controlling interests | 320 | 373 | 379
Non-Wholly Owned Subsidiaries |  |  |
Disclosure of subsidiaries [line items] |  |  |
Revenues | 1,430 | 1,619 | 1,561
Non-controlling interests | 320 | 373 | 379
Other Comprehensive Income (loss) | (357) | (12) | (450)
Net Income | 162 | 235 | 238
Other Comprehensive Income (loss) | 15 | 245 | (104)
U.K. regulated distribution operation |  |  |
Disclosure of subsidiaries [line items] |  |  |
Revenues | 488 | 478 | 449
Non-controlling interests | 11 | 24 | 22
Other Comprehensive Income (loss) | 42 | 71 | 19
Net Income | 46 | 103 | 99
Other Comprehensive Income (loss) | 167 | 278 | 86
Brazilian regulated gas transmission operation |  |  |
Disclosure of subsidiaries [line items] |  |  |
Revenues | 942 | 1,141 | 1,112
Non-controlling interests | 309 | 349 | 357
Other Comprehensive Income (loss) | (399) | (83) | (469)
Net Income | 116 | 132 | 139
Other Comprehensive Income (loss) | $ (152) | $ (33) | $ (190)

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