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DISPOSITIONS AND ACQUISITIONS (TF Holdings Limited) (Details) $ in Millions			12 Months Ended
	Dec. 21, 2018 USD ($)	Nov. 16, 2016 USD ($) $ / lb	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Nov. 15, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from divestiture, net	$ 350
Other assets			$ 2,172	$ 2,273
Freeport Cobalt
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Other assets			3
Kisanfu Exploration Project
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Ownership percentage				56.00%
Disposed of by Sale, Discontinued Operations | TF Holdings Limited
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenues			0	$ 13	$ 959
Proceeds from divestiture, net		$ 2,650
Contingent receivable		120
Other assets			57	74
Chainge in fair value of contingent consideration			$ (17)	61	13
TF Holdings Limited
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Ownership percentage						70.00%
Copper | Disposed of by Sale, Discontinued Operations | TF Holdings Limited
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Contingent receivable		60
Cobalt | Disposed of by Sale, Discontinued Operations | TF Holdings Limited
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Contingent receivable		$ 60
Contingent consideration, reference threshold, price per barrel (in us dollars per pound) | $ / lb		20
Eliminations | Disposed of by Sale, Discontinued Operations | TF Holdings Limited
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenues				$ (13)	$ 157
Maximum | Copper | Disposed of by Sale, Discontinued Operations | TF Holdings Limited
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Contingent consideration, reference threshold, price per barrel (in us dollars per pound) | $ / lb		3.50

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