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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]      
Cash Flow Activities, Operating $ 2,530 $ 2,143 $ 1,362
Cash Flow Activities, Investing (4,609) (11,372) (5,564)
Cash Flow Activities, Financing 2,126 9,542 4,418
Disposal of investments in associates and joint ventures 0 135 1,289
Non-Wholly Owned Subsidiaries      
Disclosure of subsidiaries [line items]      
Cash Flow Activities, Operating 2,396 2,110 1,245
Cash Flow Activities, Investing (4,537) (11,125) (5,486)
Cash Flow Activities, Financing 2,200 9,337 4,451
U.K. regulated distribution operation      
Disclosure of subsidiaries [line items]      
Cash Flow Activities, Operating 241 271 226
Cash Flow Activities, Investing (372) (416) (413)
Cash Flow Activities, Financing 133 147 179
Colombian regulated distribution operation      
Disclosure of subsidiaries [line items]      
Cash Flow Activities, Operating 2 26 11
Cash Flow Activities, Investing 0 (24) (26)
Cash Flow Activities, Financing (2) (4) 0
Brazilian regulated gas transmission operation      
Disclosure of subsidiaries [line items]      
Cash Flow Activities, Operating 634 839 868
Cash Flow Activities, Investing (34) (21) (26)
Cash Flow Activities, Financing (588) (702) (792)
Colombian natural gas distribution operation      
Disclosure of subsidiaries [line items]      
Cash Flow Activities, Operating 89 72 94
Cash Flow Activities, Investing (35) (38) (217)
Cash Flow Activities, Financing (55) (73) 205
Brazilian electricity transmission operation      
Disclosure of subsidiaries [line items]      
Cash Flow Activities, Operating 13 22  
Cash Flow Activities, Investing 0 (4)  
Cash Flow Activities, Financing (14) (6)  
Canadian district energy operation      
Disclosure of subsidiaries [line items]      
Cash Flow Activities, Operating 42 53 39
Cash Flow Activities, Investing (97) (68) (42)
Cash Flow Activities, Financing 55 14 (45)
U.S. district energy operation      
Disclosure of subsidiaries [line items]      
Cash Flow Activities, Operating 51 22 24
Cash Flow Activities, Investing (50) (29) (16)
Cash Flow Activities, Financing 0 2 (18)
North American residential energy infrastructure operation      
Disclosure of subsidiaries [line items]      
Cash Flow Activities, Operating (42) 128 16
Cash Flow Activities, Investing (5) (228) (2,182)
Cash Flow Activities, Financing 45 87 2,188
Indian gas transmission operation      
Disclosure of subsidiaries [line items]      
Cash Flow Activities, Operating 136 208  
Cash Flow Activities, Investing (14) (1,950)  
Cash Flow Activities, Financing (117) 1,746  
Australian export terminal      
Disclosure of subsidiaries [line items]      
Cash Flow Activities, Operating 68 91 85
Cash Flow Activities, Investing (27) (23) (21)
Cash Flow Activities, Financing (57) (55) (63)
North American rail operation      
Disclosure of subsidiaries [line items]      
Cash Flow Activities, Operating 616 0  
Cash Flow Activities, Investing (24) (6,460)  
Cash Flow Activities, Financing (606) 6,578  
U.K. ports operation      
Disclosure of subsidiaries [line items]      
Cash Flow Activities, Operating 42 27 27
Cash Flow Activities, Investing (25) (43) (17)
Cash Flow Activities, Financing (11) 9 (8)
Australian port operation      
Disclosure of subsidiaries [line items]      
Cash Flow Activities, Operating 28 52 42
Cash Flow Activities, Investing (32) (45) (68)
Cash Flow Activities, Financing 26 (10) 22
Chilean toll roads      
Disclosure of subsidiaries [line items]      
Cash Flow Activities, Operating 49 62 74
Cash Flow Activities, Investing (1) (2) (1)
Cash Flow Activities, Financing (34) (55) (82)
Peruvian toll roads      
Disclosure of subsidiaries [line items]      
Cash Flow Activities, Operating 18 47 91
Cash Flow Activities, Investing (22) (39) (33)
Cash Flow Activities, Financing 0 0 0
Indian toll roads      
Disclosure of subsidiaries [line items]      
Cash Flow Activities, Operating 11 7 18
Cash Flow Activities, Investing (18) (9) (184)
Cash Flow Activities, Financing 19 (29) 209
North American gas storage operation      
Disclosure of subsidiaries [line items]      
Cash Flow Activities, Operating 68 83 0
Cash Flow Activities, Investing 12 (10) (8)
Cash Flow Activities, Financing (53) (63) 7
Western Canadian natural gas gathering and processing operation      
Disclosure of subsidiaries [line items]      
Cash Flow Activities, Operating 156 92 48
Cash Flow Activities, Investing (299) (1,396) (1,923)
Cash Flow Activities, Financing 114 1,339 1,910
U.S. data center operation      
Disclosure of subsidiaries [line items]      
Cash Flow Activities, Operating 77 51 (1)
Cash Flow Activities, Investing (16) (6) (1,103)
Cash Flow Activities, Financing (63) (35) 1,118
Australian Data Center Operation      
Disclosure of subsidiaries [line items]      
Cash Flow Activities, Operating 7 0  
Cash Flow Activities, Investing (3) (277)  
Cash Flow Activities, Financing (3) 286  
U.K. telecom towers operation      
Disclosure of subsidiaries [line items]      
Cash Flow Activities, Operating 27 3  
Cash Flow Activities, Investing (20) (280)  
Cash Flow Activities, Financing (9) 289  
Indian telecom towers operation      
Disclosure of subsidiaries [line items]      
Cash Flow Activities, Operating 245 0  
Cash Flow Activities, Investing (3,451) 0  
Cash Flow Activities, Financing 3,331 0  
Holding LP and other      
Disclosure of subsidiaries [line items]      
Cash Flow Activities, Operating (182) (46) (417)
Cash Flow Activities, Investing (4) 243 794
Cash Flow Activities, Financing $ 89 $ (128) $ (379)