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NON-WHOLLY OWNED SUBSIDIARIES - Summarized Statement of Operations (Details) - USD ($)
$ in Millions
 12 Months Ended
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)