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