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DISPOSITIONS AND ACQUISITIONS (Timok) (Details) - USD ($) $ in Millions |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Dec. 21, 2018 | May 31, 2016 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | May 02, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Proceeds from divestiture, net | $ 350 |  |  |  |  |
Net gain (loss) on sales of assets |  |  | $ 208 | $ 81 | $ 649 |
Timok |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Proceeds from divestiture, net |  | $ 135 |  |  |  |
Amount of contingent liabilities remaining |  |  |  |  |  | $ 107
Net gain (loss) on sales of assets |  |  |  |  | $ 133 |

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