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SUBSIDIARIES (Details) - USD ($) $ in Millions |  | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Apr. 04, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Aug. 18, 2016 | Jul. 19, 2016 | Jun. 28, 2016 | Mar. 01, 2016
Brazilian regulated gas transmission operation |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |
Ownership interest (%) | 28.00% |  |  |  |  |  |
Consideration transferred | $ 1,568 |  |  |  |  |  |
Australian port operation |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |
Consideration transferred |  |  |  | $ 145 |  |  |
Percentage of voting equity interests acquired |  |  |  | 27.00% |  |  |
Indian toll roads |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |
Consideration transferred |  |  |  |  |  |  | $ 42
Percentage of voting equity interests acquired |  |  |  |  |  |  | 40.00%
Peruvian toll roads |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |
Consideration transferred |  |  |  |  |  | $ 127 |
Percentage of voting equity interests acquired |  |  |  |  |  | 17.00% |
North American gas storage operation |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |
Consideration transferred |  |  |  |  | $ 227 |  |
Percentage of voting equity interests acquired |  |  |  |  | 40.00% |  |
Australian rail operation |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |
Ownership interest (%) |  | 100.00% | 100.00% |  |  |  |
Australian energy distribution operation |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |
Ownership interest (%) |  | 100.00% | 100.00% |  |  |  |
U.K. regulated distribution |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |
Ownership interest (%) |  | 80.00% | 80.00% |  |  |  |
Voting interest (%) |  | 80.00% | 80.00% |  |  |  |
Australian regulated terminal |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |
Ownership interest (%) |  | 71.00% | 71.00% |  |  |  |
Voting interest (%) |  | 100.00% | 100.00% |  |  |  |
Colombian regulated distribution |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |
Ownership interest (%) |  | 17.00% | 17.00% |  |  |  |
Voting interest (%) |  | 100.00% | 100.00% |  |  |  |
Brazilian regulated gas transmission operation |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |
Ownership interest (%) |  | 28.00% | 0.00% |  |  |  |
Voting interest (%) |  | 90.00% | 0.00% |  |  |  |
U.K. port operation |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |
Ownership interest (%) |  | 59.00% | 59.00% |  |  |  |
Voting interest (%) |  | 100.00% | 100.00% |  |  |  |
Australian port operation |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |
Ownership interest (%) |  | 27.00% | 27.00% |  |  |  |
Voting interest (%) |  | 67.00% | 67.00% |  |  |  |
Chilean toll roads |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |
Ownership interest (%) |  | 51.00% | 51.00% |  |  |  |
Voting interest (%) |  | 89.00% | 89.00% |  |  |  |
Indian toll roads |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |
Ownership interest (%) |  | 40.00% | 40.00% |  |  |  |
Voting interest (%) |  | 93.00% | 93.00% |  |  |  |
Peruvian toll roads |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |
Ownership interest (%) |  | 17.00% | 17.00% |  |  |  |
Voting interest (%) |  | 57.00% | 57.00% |  |  |  |
North American gas storage - Warwick Gas Storage L.P. |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |
Ownership interest (%) |  | 25.00% | 25.00% |  |  |  |
Voting interest (%) |  | 100.00% | 100.00% |  |  |  |
Canadian district energy operation |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |
Ownership interest (%) |  | 25.00% | 25.00% |  |  |  |
Voting interest (%) |  | 100.00% | 100.00% |  |  |  |
U.S. district energy operation |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |
Ownership interest (%) |  | 40.00% | 40.00% |  |  |  |
Voting interest (%) |  | 100.00% | 100.00% |  |  |  |
North American gas storage operation - Lodi Gas Storage |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |
Ownership interest (%) |  | 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] |  |  |  |  |  |  |
Ownership interest (%) |  | 40.00% | 40.00% |  |  |  |
Voting interest (%) |  | 100.00% | 100.00% |  |  |  |
Holding LP and other |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |
Ownership interest (%) |  | 70.00% | 70.00% |  |  |  |
Voting interest (%) |  | 100.00% | 100.00% |  |  |  |

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