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SUBSIDIARIES (Details) | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Australian rail operation |  |
Disclosure of subsidiaries [line items] |  |
Proportion of ownership interest in subsidiary | 100.00% | 100.00%
Australian energy distribution 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%
Australian regulated terminal operation |  |
Disclosure of subsidiaries [line items] |  |
Proportion of ownership interest in subsidiary | 71.00% | 71.00%
Voting interest (%) | 100.00% | 100.00%
Colombian regulated distribution operation |  |
Disclosure of subsidiaries [line items] |  |
Proportion of ownership interest in subsidiary | 17.00% | 17.00%
Voting interest (%) | 100.00% | 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 Gas Distribution Operation [Member] |  |
Disclosure of subsidiaries [line items] |  |
Proportion of ownership interest in subsidiary | 16.00% | 0.00%
Voting interest (%) | 55.00% | 0.00%
U.K. port 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 | 51.00% | 51.00%
Voting interest (%) | 89.00% | 89.00%
BIF India Holdings Pte Ltd [Member] |  |
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%
Simhapuri Expressway Limited [Domain] |  |
Disclosure of subsidiaries [line items] |  |
Proportion of ownership interest in subsidiary | 29.00% | 0.00%
Voting interest (%) | 93.00% | 0.00%
Rayalseema Expressway Limited [Domain] |  |
Disclosure of subsidiaries [line items] |  |
Proportion of ownership interest in subsidiary | 26.00% | 0.00%
Voting interest (%) | 84.00% | 0.00%
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%
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%
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 [Member] |  |
Disclosure of subsidiaries [line items] |  |
Proportion of ownership interest in subsidiary | 29.00% | 0.00%
Voting interest (%) | 100.00% | 0.00%
North American District Energy Operation [Member] |  |
Disclosure of subsidiaries [line items] |  |
Proportion of ownership interest in subsidiary | 30.00% | 0.00%
Voting interest (%) | 100.00% | 0.00%
U.S. Data Center Operation [Member] |  |
Disclosure of subsidiaries [line items] |  |
Proportion of ownership interest in subsidiary | 29.00% | 0.00%
Voting interest (%) | 100.00% | 0.00%
Holding LP and other |  |
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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