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DISPOSITIONS AND ACQUISITIONS (Timok) (Details) - USD ($) $ in Millions |  | 12 Months Ended
--- | --- | ---
May 02, 2016 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Net gain on sales of assets |  | $ 649 | $ 39 | $ 717
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 on sales of assets | $ 133 |  |  |

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