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INVESTMENT IN ASSOCIATES AND JOINT VENTURES - Additional Information (Details) |  |  |  |  |  |  | 3 Months Ended | 6 Months Ended | 12 Months Ended
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Dec. 19, 2019 | Oct. 21, 2019 USD ($) | Oct. 21, 2019 | Oct. 07, 2019 | Jul. 31, 2019 USD ($) | Jun. 25, 2019 USD ($) | Mar. 31, 2019 USD ($) | Jun. 30, 2020 USD ($) | Jun. 30, 2019 USD ($) | Jun. 30, 2020 USD ($) | Jun. 30, 2019 USD ($) | Dec. 31, 2019 USD ($)
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sales of investments accounted for using equity method |  |  |  |  |  |  |  | $ 0 | $ 135,000,000 | $ 0 | $ 135,000,000 |
Investments Reclassified as Held for Sale |  |  |  |  |  |  |  |  |  | 2,000,000 |  | $ 38,000,000
Acquisitions |  |  |  |  |  |  |  |  |  | $ 0 |  | $ 587,000,000
Ramones II Sur [Member] |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Ownership Interest |  |  | 11.00% |  |  |  |  |  |  |  |  |
Proportion of voting rights held in associate |  |  |  |  |  |  |  |  |  | 45.00% |  |
Los Ramones [Member] |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Acquisitions |  | $ 140,000,000 |  |  |  |  |  |  |  |  |  |
North American Natural Gas Transmission Operation [Member] |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Loans and receivables |  |  |  |  |  |  |  | $ 500,000,000 |  | $ 500,000,000 |  |
European port operation [Member] |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sales of investments accounted for using equity method |  |  |  |  |  | $ 135,000,000 |  |  |  |  |  |
Ownership Interest |  |  |  |  |  | 40.00% |  |  |  |  |  |
Texas electricity transmission project [Member] |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Investments Reclassified as Held for Sale |  |  |  |  |  |  |  |  |  | $ 2,000,000 |  |
Ownership Interest | 11.00% |  |  |  |  |  |  |  |  |  |  |
Brazilian Data Center Operation [Member] |  |  |  |  |  |  |  |  |  |  |  |
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% |  |  |  |  |
New Zealand Data Distribution Business [Member] |  |  |  |  |  |  |  |  |  |  |  |
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 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Ownership Interest |  |  |  | 13.00% |  |  |  |  |  |  |  |
Proportion of voting rights held in associate |  |  |  |  |  |  |  |  |  | 50.00% |  |
European Telecommunications Infrastructure Operations [Member] |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of Towers and Rooftop Sites |  |  |  |  |  |  |  | 7,000 |  | 7,000 |  |
Kilometers of Fiber Backbone |  |  |  |  |  |  |  | 5,500 |  | 5,500 |  |
Forecast [Member] | Texas electricity transmission project [Member] |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sales of investments accounted for using equity method |  |  |  |  |  |  |  |  |  | $ 60,000,000 |  |

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