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INVESTMENT IN ASSOCIATES AND JOINT VENTURES - Additional Information (Details) site in Thousands |  |  |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Dec. 07, 2020 USD ($) | Oct. 21, 2019 | Oct. 21, 2019 USD ($) | Oct. 07, 2019 | Sep. 30, 2020 USD ($) | Jul. 31, 2020 USD ($) | Jul. 31, 2019 USD ($) | Jun. 30, 2019 USD ($) | Mar. 31, 2019 USD ($) | Dec. 31, 2020 USD ($) business site km | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Disposal of investments in associates and joint ventures |  |  |  |  |  |  |  |  |  | $ 0 | $ 135,000,000 | $ 1,289,000,000
Change in basis of accounting |  |  |  |  |  |  |  |  |  | 466,000,000 | 0 |
Acquisitions |  |  |  |  |  |  |  |  |  | 369,000,000 | 587,000,000 |
Associates and joint ventures with quoted prices in an active market |  |  |  |  |  |  |  |  |  | $ 2 | $ 0 |
Australian export terminal |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Disposal of ownership interest, percentage | 22.00% |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest in subsidiary | 49.00% |  |  |  |  |  |  |  |  | 0.00% | 71.00% |
Change in basis of accounting | $ 466,000,000 |  |  |  |  |  |  |  |  |  |  |
Brazilian electricity transmission operation |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Ownership and voting Interest |  |  |  |  |  |  |  |  |  | 15.00% |  |
Mexico regulated gas transmission operation |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Ownership and voting Interest |  |  |  |  |  |  |  |  |  | 13.00% |  |
Mexico Regulated Gas Transmission Operation 2 |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Ownership and voting Interest |  |  |  |  |  |  |  |  |  | 11.00% |  |
Regulated Natural Gas Transmission Business In Mexico |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of businesses | business |  |  |  |  |  |  |  |  |  | 2 |  |
Colombian natural gas distribution operation |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of associates and joint ventures |  |  |  |  |  |  |  |  |  | 4 |  |
Brazilian toll roads |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Ownership and voting Interest |  |  |  |  |  |  |  |  |  | 45.00% |  |
Brazilian Rail Business |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Ownership and voting Interest |  |  |  |  |  |  |  |  |  | 11.00% |  |
North American west coast container terminal |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Ownership and voting Interest |  |  |  |  |  |  |  |  |  | 19.00% |  |
Australian port operation |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Ownership and voting Interest |  |  |  |  |  |  |  |  |  | 13.00% |  |
Australian Ports Operation 2 |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Ownership and voting Interest |  |  |  |  |  |  |  |  |  | 26.00% |  |
Australian Ports Operation 3 |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Ownership and voting Interest |  |  |  |  |  |  |  |  |  | 49.00% |  |
U.S. LNG export terminal |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Ownership and voting Interest |  |  |  |  |  |  |  |  |  | 6.00% |  |
Ownership interest |  |  |  |  | 6.00% |  |  |  |  |  |  |
Acquisitions |  |  |  |  | $ 369,000,000 |  |  |  |  |  |  |
North American natural gas transmission operation |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Ownership and voting Interest |  |  |  |  |  |  |  |  |  | 50.00% |  |
Loans and receivables |  |  |  |  |  |  |  |  |  | $ 500,000,000 |  |
North American gas storage operation |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Ownership and voting Interest |  |  |  |  |  |  |  |  |  | 20.00% |  |
European telecommunications infrastructure operations |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Ownership and voting Interest |  |  |  |  |  |  |  |  |  | 21.00% |  |
Number of towers and rooftop sites | site |  |  |  |  |  |  |  |  |  | 7 |  |
Kilometers of fiber backbone | km |  |  |  |  |  |  |  |  |  | 5,500 |  |
Australian Data Center Operation |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Ownership and voting Interest |  |  |  |  |  |  |  |  |  | 12.00% |  |
New Zealand Data Center Operation |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Ownership and voting Interest |  |  |  |  |  |  |  |  |  | 13.00% |  |
European port operation |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest |  |  |  |  |  |  |  | 40.00% |  |  |  |
Disposal of investments in associates and joint ventures |  |  |  |  |  |  |  | $ 135,000,000 |  |  |  |
Texas electricity transmission project |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest |  |  |  |  |  | 11.00% |  |  |  |  |  |
Disposal of investments in associates and joint ventures |  |  |  |  |  | $ 60,000,000 |  |  |  |  |  |
Gain on sale of investment |  |  |  |  |  | $ 20,000,000 |  |  |  |  |  |
Disposal of ownership interest, percentage |  |  |  |  |  |  |  |  |  | 11.00% |  |
Brazilian Data Center Operation |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest |  |  |  |  |  |  |  |  | 12.00% |  |  |
Acquisitions |  |  |  |  |  |  |  |  | $ 190,000,000 |  |  |
Proportion of voting rights held in associate |  |  |  |  |  |  |  |  | 50.00% |  |  |
Australian Data Transmission and Distribution Operation |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest |  |  |  |  |  |  | 12.00% |  |  |  |  |
Acquisitions |  |  |  |  |  |  | $ 170,000,000 |  |  |  |  |
Proportion of voting rights held in associate |  |  |  |  |  |  | 50.00% |  |  |  |  |
Ramones II Norte |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest |  |  |  | 13.00% |  |  |  |  |  |  |  |
Proportion of voting rights held in associate |  |  |  |  |  |  |  |  |  | 50.00% |  |
Ramones II Sur |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest |  | 11.00% |  |  |  |  |  |  |  |  |  |
Proportion of voting rights held in associate |  |  |  |  |  |  |  |  |  | 45.00% |  |
Los Ramones |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Acquisitions |  |  | $ 140,000,000 |  |  |  |  |  |  |  |  |
Sabine Pass |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Proportion of voting rights held in associate |  |  |  |  |  |  |  |  |  | 41.00% |  |

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