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REVENUES (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Disclosure of operating segments [line items] |  |  |  |
Revenue | $ 1,044 | $ 934 | $ 2,057 | $ 1,590
Utilities |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Revenue | 589 |  | 1,124 |
Transport |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Revenue | 341 |  | 680 |
Energy |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Revenue | $ 114 |  | $ 253 |

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