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SUBSIDIARIES (Details) |  | 12 Months Ended
--- | --- | ---
Dec. 07, 2020 | Dec. 31, 2020 | Dec. 31, 2019
Australian rail operation |  |  |
Disclosure of subsidiaries [line items] |  |  |
Proportion of ownership interest in subsidiary |  | 100.00% | 100.00%
U.K. regulated distribution operation |  |  |
Disclosure of subsidiaries [line items] |  |  |
Proportion of ownership interest in subsidiary |  | 80.00% | 80.00%
Voting interest (%) |  | 80.00% | 80.00%
Canadian district energy operation |  |  |
Disclosure of subsidiaries [line items] |  |  |
Proportion of ownership interest in subsidiary |  | 25.00% | 25.00%
Voting interest (%) |  | 100.00% | 100.00%
U.S. district energy operation |  |  |
Disclosure of subsidiaries [line items] |  |  |
Proportion of ownership interest in subsidiary |  | 40.00% | 40.00%
Voting interest (%) |  | 100.00% | 100.00%
Colombian regulated distribution operation |  |  |
Disclosure of subsidiaries [line items] |  |  |
Proportion of ownership interest in subsidiary |  | 0.00% | 17.00%
Voting interest (%) |  | 0.00% | 100.00%
Brazilian regulated gas transmission operation |  |  |
Disclosure of subsidiaries [line items] |  |  |
Proportion of ownership interest in subsidiary |  | 28.00% | 28.00%
Voting interest (%) |  | 90.00% | 90.00%
Colombian natural gas distribution operation |  |  |
Disclosure of subsidiaries [line items] |  |  |
Proportion of ownership interest in subsidiary |  | 21.00% | 16.00%
Voting interest (%) |  | 75.00% | 55.00%
Brazilian electricity transmission operation |  |  |
Disclosure of subsidiaries [line items] |  |  |
Proportion of ownership interest in subsidiary |  | 31.00% | 31.00%
Voting interest (%) |  | 100.00% | 100.00%
North American residential energy infrastructure operation |  |  |
Disclosure of subsidiaries [line items] |  |  |
Proportion of ownership interest in subsidiary |  | 30.00% | 30.00%
Voting interest (%) |  | 100.00% | 100.00%
Indian gas transmission operation |  |  |
Disclosure of subsidiaries [line items] |  |  |
Proportion of ownership interest in subsidiary |  | 24.00% | 24.00%
Voting interest (%) |  | 83.00% | 83.00%
Australian export terminal |  |  |
Disclosure of subsidiaries [line items] |  |  |
Proportion of ownership interest in subsidiary | 49.00% | 0.00% | 71.00%
Voting interest (%) |  | 0.00% | 100.00%
Disposal of ownership interest, percentage | 22.00% |  |
North American rail operation |  |  |
Disclosure of subsidiaries [line items] |  |  |
Proportion of ownership interest in subsidiary |  | 9.00% | 9.00%
Voting interest (%) |  | 72.00% | 72.00%
U.K. ports operation |  |  |
Disclosure of subsidiaries [line items] |  |  |
Proportion of ownership interest in subsidiary |  | 59.00% | 59.00%
Voting interest (%) |  | 100.00% | 100.00%
Australian port operation |  |  |
Disclosure of subsidiaries [line items] |  |  |
Proportion of ownership interest in subsidiary |  | 27.00% | 27.00%
Voting interest (%) |  | 67.00% | 67.00%
Chilean toll roads |  |  |
Disclosure of subsidiaries [line items] |  |  |
Proportion of ownership interest in subsidiary |  | 17.00% | 34.00%
Voting interest (%) |  | 60.00% | 60.00%
Indian toll roads |  |  |
Disclosure of subsidiaries [line items] |  |  |
Proportion of ownership interest in subsidiary |  | 40.00% | 40.00%
Voting interest (%) |  | 93.00% | 93.00%
Peruvian toll roads |  |  |
Disclosure of subsidiaries [line items] |  |  |
Proportion of ownership interest in subsidiary |  | 17.00% | 17.00%
Voting interest (%) |  | 57.00% | 57.00%
Indian toll roads - Simhapuri Expressway Limited |  |  |
Disclosure of subsidiaries [line items] |  |  |
Proportion of ownership interest in subsidiary |  | 29.00% | 29.00%
Voting interest (%) |  | 93.00% | 93.00%
Indian roll roads - Rayalseema Expressway Limited |  |  |
Disclosure of subsidiaries [line items] |  |  |
Proportion of ownership interest in subsidiary |  | 26.00% | 26.00%
Voting interest (%) |  | 84.00% | 84.00%
North American gas storage - Warwick Gas Storage L.P. |  |  |
Disclosure of subsidiaries [line items] |  |  |
Proportion of ownership interest in subsidiary |  | 25.00% | 25.00%
Voting interest (%) |  | 100.00% | 100.00%
North American gas storage operation - Lodi Gas Storage |  |  |
Disclosure of subsidiaries [line items] |  |  |
Proportion of ownership interest in subsidiary |  | 40.00% | 40.00%
Voting interest (%) |  | 100.00% | 100.00%
North American gas storage operation - Rockpoint Gas Storage Partners L.P. |  |  |
Disclosure of subsidiaries [line items] |  |  |
Proportion of ownership interest in subsidiary |  | 40.00% | 40.00%
Voting interest (%) |  | 100.00% | 100.00%
Western Canadian natural gas gathering and processing operation |  |  |
Disclosure of subsidiaries [line items] |  |  |
Proportion of ownership interest in subsidiary |  | 29.00% | 29.00%
Voting interest (%) |  | 100.00% | 100.00%
U.S. data center operation |  |  |
Disclosure of subsidiaries [line items] |  |  |
Proportion of ownership interest in subsidiary |  | 29.00% | 29.00%
Voting interest (%) |  | 100.00% | 100.00%
Australian data center operation |  |  |
Disclosure of subsidiaries [line items] |  |  |
Proportion of ownership interest in subsidiary |  | 29.00% | 29.00%
Voting interest (%) |  | 100.00% | 100.00%
Indian telecom towers operation |  |  |
Disclosure of subsidiaries [line items] |  |  |
Proportion of ownership interest in subsidiary |  | 17.00% | 0.00%
Voting interest (%) |  | 62.00% | 0.00%
U.K. telecom towers operation |  |  |
Disclosure of subsidiaries [line items] |  |  |
Proportion of ownership interest in subsidiary |  | 25.00% | 25.00%
Voting interest (%) |  | 100.00% | 100.00%
Holding LP |  |  |
Disclosure of subsidiaries [line items] |  |  |
Proportion of ownership interest in subsidiary |  | 70.00% | 70.00%
Voting interest (%) |  | 100.00% | 100.00%

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