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NON-WHOLLY OWNED SUBSIDIARIES - Summarized Cash Flow Activities (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Disclosure of subsidiaries [line items] |  |  |
Cash flow activities, operating | $ 2,772 | $ 2,530 | $ 2,143
Cash flow activities, investing | (1,173) | (4,609) | (11,372)
Cash from financing activities | (995) | 2,126 | 9,542
Non-Wholly Owned Subsidiaries |  |  |
Disclosure of subsidiaries [line items] |  |  |
Cash flow activities, operating | 2,685 | 2,396 | 2,110
Cash flow activities, investing | (1,149) | (4,537) | (11,125)
Cash from financing activities | (927) | 2,200 | 9,337
U.K. regulated distribution operation |  |  |
Disclosure of subsidiaries [line items] |  |  |
Cash flow activities, operating | 273 | 241 | 271
Cash flow activities, investing | 344 | (372) | (416)
Cash from financing activities | (582) | 133 | 147
Colombian regulated distribution operation |  |  |
Disclosure of subsidiaries [line items] |  |  |
Cash flow activities, operating | 0 | 2 | 26
Cash flow activities, investing | 0 | 0 | (24)
Cash from financing activities | 0 | (2) | (4)
Brazilian regulated gas transmission operation |  |  |
Disclosure of subsidiaries [line items] |  |  |
Cash flow activities, operating | 768 | 634 | 839
Cash flow activities, investing | (32) | (34) | (21)
Cash from financing activities | (473) | (588) | (702)
Colombian natural gas distribution operation |  |  |
Disclosure of subsidiaries [line items] |  |  |
Cash flow activities, operating | 91 | 89 | 72
Cash flow activities, investing | (38) | (35) | (38)
Cash from financing activities | (41) | (55) | (73)
Brazil electricity transmission operation |  |  |
Disclosure of subsidiaries [line items] |  |  |
Cash flow activities, operating | 29 | 13 | 22
Cash flow activities, investing | 70 | 0 | (4)
Cash from financing activities | (24) | (14) | (6)
Canadian District Energy Operation |  |  |
Disclosure of subsidiaries [line items] |  |  |
Cash flow activities, operating | 30 | 42 | 53
Cash flow activities, investing | (38) | (97) | (68)
Cash from financing activities | 7 | 55 | 14
U.S. district energy operation |  |  |
Disclosure of subsidiaries [line items] |  |  |
Cash flow activities, operating | 13 | 51 | 22
Cash flow activities, investing | (34) | (50) | (29)
Cash from financing activities | 25 | 0 | 2
North American residential energy infrastructure operation |  |  |
Disclosure of subsidiaries [line items] |  |  |
Cash flow activities, operating | (79) | (42) | 128
Cash flow activities, investing | (107) | (5) | (228)
Cash from financing activities | 189 | 45 | 87
Indian gas transmission operation |  |  |
Disclosure of subsidiaries [line items] |  |  |
Cash flow activities, operating | 187 | 136 | 208
Cash flow activities, investing | (51) | (14) | (1,950)
Cash from financing activities | (120) | (117) | 1,746
UK Residential Infrastructure Business |  |  |
Disclosure of subsidiaries [line items] |  |  |
Cash flow activities, operating | 0 | 0 |
Cash flow activities, investing | 1 | 0 |
Cash from financing activities | 0 | 0 |
European Residential Infrastructure Operation |  |  |
Disclosure of subsidiaries [line items] |  |  |
Cash flow activities, operating | (6) | 0 |
Cash flow activities, investing | 15 | 0 |
Cash from financing activities | 0 | 0 |
Australian Export Terminal |  |  |
Disclosure of subsidiaries [line items] |  |  |
Cash flow activities, operating | 0 | 68 | 91
Cash flow activities, investing | 0 | (27) | (23)
Cash from financing activities | 0 | (57) | (55)
North American rail operation |  |  |
Disclosure of subsidiaries [line items] |  |  |
Cash flow activities, operating | 511 | 616 | 0
Cash flow activities, investing | (98) | (24) | (6,460)
Cash from financing activities | (424) | (606) | 6,578
U.K. ports operation |  |  |
Disclosure of subsidiaries [line items] |  |  |
Cash flow activities, operating | 66 | 42 | 27
Cash flow activities, investing | (53) | (25) | (43)
Cash from financing activities | (24) | (11) | 9
Australian port operation |  |  |
Disclosure of subsidiaries [line items] |  |  |
Cash flow activities, operating | 11 | 28 | 52
Cash flow activities, investing | (21) | (32) | (45)
Cash from financing activities | (18) | 26 | (10)
Chilean toll roads |  |  |
Disclosure of subsidiaries [line items] |  |  |
Cash flow activities, operating | 46 | 49 | 62
Cash flow activities, investing | (172) | (1) | (2)
Cash from financing activities | 85 | (34) | (55)
Peruvian toll roads |  |  |
Disclosure of subsidiaries [line items] |  |  |
Cash flow activities, operating | 30 | 18 | 47
Cash flow activities, investing | (27) | (22) | (39)
Cash from financing activities | 0 | 0 | 0
Indian Toll Roads |  |  |
Disclosure of subsidiaries [line items] |  |  |
Cash flow activities, operating | (2) | 11 | 7
Cash flow activities, investing | 3 | (18) | (9)
Cash from financing activities | 5 | 19 | (29)
North American gas storage operation |  |  |
Disclosure of subsidiaries [line items] |  |  |
Cash flow activities, operating | 196 | 68 | 83
Cash flow activities, investing | (35) | 12 | (10)
Cash from financing activities | (179) | (53) | (63)
Canadian diversified midstream operation |  |  |
Disclosure of subsidiaries [line items] |  |  |
Cash flow activities, operating | 198 | 0 |
Cash flow activities, investing | (246) | 0 |
Cash from financing activities | 108 | 0 |
Western Canadian natural gas gathering and processing operation |  |  |
Disclosure of subsidiaries [line items] |  |  |
Cash flow activities, operating | 235 | 156 | 92
Cash flow activities, investing | (91) | (299) | (1,396)
Cash from financing activities | (135) | 114 | 1,339
U.S. data center operation |  |  |
Disclosure of subsidiaries [line items] |  |  |
Cash flow activities, operating | 38 | 77 | 51
Cash flow activities, investing | (25) | (16) | (6)
Cash from financing activities | (15) | (63) | (35)
Australian data center operation |  |  |
Disclosure of subsidiaries [line items] |  |  |
Cash flow activities, operating | 16 | 7 | 0
Cash flow activities, investing | (105) | (3) | (277)
Cash from financing activities | 104 | (3) | 286
U.K. telecom towers operation |  |  |
Disclosure of subsidiaries [line items] |  |  |
Cash flow activities, operating | 16 | 27 | 3
Cash flow activities, investing | (15) | (20) | (280)
Cash from financing activities | 2 | (9) | 289
Indian Telecom Towers Operation |  |  |
Disclosure of subsidiaries [line items] |  |  |
Cash flow activities, operating | 189 | 245 |
Cash flow activities, investing | (416) | (3,451) |
Cash from financing activities | 261 | 3,331 |
Holding LP and other |  |  |
Disclosure of subsidiaries [line items] |  |  |
Cash flow activities, operating | (171) | (182) | (46)
Cash flow activities, investing | 22 | (4) | 243
Cash from financing activities | $ 322 | $ 89 | $ (128)

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