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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)