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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)

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