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DISPOSITIONS AND ACQUISITIONS (FCX Consolidated Balance Sheet) (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 21, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Other current assets | $ 422 |  | $ 286
Property, plant, equipment and mine development costs, net | 28,010 |  | 22,994
Noncontrolling interests | (8,094) |  | (3,319)
Capital in excess of par value | $ 26,013 |  | $ 26,751
PT-FI | Rio Tinto Share In Joint Venture |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Cash |  | $ 458 |
Other current assets |  | 23 |
Liabilities other than taxes |  | (77) |
Deferred income taxes, net |  | (788) |
Noncontrolling interests |  | (4,762) |
Capital in excess of par value |  | 531 |
PT-FI | Rio Tinto Share In Joint Venture | Mineral reserves |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Property, plant, equipment and mine development costs, net |  | 3,056 |
PT-FI | Rio Tinto Share In Joint Venture | Mine development, infrastructure and other |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Property, plant, equipment and mine development costs, net |  | $ 1,559 |

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