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INVESTMENT IN ASSOCIATES AND JOINT VENTURES - Additional Information (Details) - USD ($) $ in Millions |  |  |  | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Jun. 25, 2019 | Mar. 31, 2019 | Mar. 15, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |  |  |  |  |  |
Proceeds from sales of investments accounted for using equity method |  |  |  | $ 135 | $ 0 | $ 135 | $ 1,289 |
Gain (Loss) on Disposition of Business |  |  |  | $ 0 | $ 0 | 0 | $ 338 |
Acquisitions |  |  |  |  |  | 235 |  | $ 78
Chilean electricity transmission operation [Member] |  |  |  |  |  |  |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |  |  |  |  |  |
Proceeds from sales of investments accounted for using equity method |  |  | $ 1,300 |  |  |  |  |
Gain (Loss) on Disposition of Business |  |  |  |  |  |  |  | 338
Gain (Loss) on Disposition of Business, Net of Tax |  |  |  |  |  |  |  | 209
Reclassification adjustments on exchange differences on translation, net of tax |  |  |  |  |  |  |  | $ 35
European port operation [Member] |  |  |  |  |  |  |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |  |  |  |  |  |
Gain (Loss) on Disposition of Business |  |  |  |  |  | $ 10 |  |
Ownership Interest | 40.00% |  |  |  |  |  |  |
Brazilian Data Center Operation [Member] |  |  |  |  |  |  |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |  |  |  |  |  |
Ownership Interest |  | 12.00% |  |  |  |  |  |
Acquisitions |  | $ 188 |  |  |  |  |  |
Proportion of voting rights held in associate |  | 50.00% |  |  |  |  |  |

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