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INVESTMENT IN ASSOCIATES AND JOINT VENTURES - Additional Information (Details) - USD ($) |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Mar. 15, 2018 | Dec. 31, 2017 | Aug. 31, 2017 | May 31, 2017 | Jun. 30, 2018 | Mar. 31, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |  |  |  |  |  |  |  |
Proceeds from sales of investments accounted for using equity method |  |  |  |  | $ 0 |  | $ 0 | $ 1,289,000,000 | $ 0 |
Gain (Loss) on Disposition of Business |  |  |  |  | $ 0 |  | $ 0 | 338,000,000 | $ 0 |
Decrease (Increase) in Investment in Associates and Joint Ventures From Disposition Of Interests |  |  |  |  |  |  |  | 951,000,000 |  | $ 177,000,000
Acquisitions |  |  |  |  |  |  |  | 72,000,000 |  | 620,000,000
Chilean electricity transmission operation [Member] |  |  |  |  |  |  |  |  |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |  |  |  |  |  |  |  |
Proceeds from sales of investments accounted for using equity method | $ 1,300,000,000 |  |  |  |  |  |  |  |  |
Gain (Loss) on Disposition of Business |  |  |  |  |  | $ 338,000,000 |  |  |  |
Gain (Loss) on Disposition of Business, Net of Tax |  |  |  |  |  | 209,000,000 |  |  |  |
Reclassification adjustments on exchange differences on translation, net of tax |  |  |  |  |  | $ 35,000,000 |  |  |  |
Brazilian toll roads |  |  |  |  |  |  |  |  |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |  |  |  |  |  |  |  |
Gain (loss) on investment |  |  | $ 0 |  |  |  |  |  |  |
Decrease (Increase) in Investment in Associates and Joint Ventures From Disposition Of Interests |  |  |  |  |  |  |  |  |  | 177,000,000
Acquisitions |  |  |  |  |  |  |  | $ 0 |  | $ 349,000,000
Ownership Interest |  | 45.00% |  |  |  |  |  |  |  | 8.00%
North American natural gas transmission operation |  |  |  |  |  |  |  |  |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |  |  |  |  |  |  |  |
Acquisitions |  |  |  | $ 200,000,000 |  |  |  |  |  |

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