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DISPOSITIONS AND ACQUISITIONS (Assets Held for Sale) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Long Lived Assets Held-for-sale [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Disposition of Assets | $ (82) | $ (70) | $ (45) | $ (11) | $ (15) | $ (33) | $ (10) | $ (23) | $ (208) | $ (81) | $ (649)
Deferred income taxes | 4,032 |  |  |  | 3,663 |  |  |  | 4,032 | 3,663 |
Property, plant, equipment and mine development costs, net | 28,010 |  |  |  | $ 22,994 |  |  |  | 28,010 | 22,994 |
Depreciation, depletion and amortization |  |  |  |  |  |  |  |  | 1,754 | $ 1,714 | 2,610
Kisanfu Exploration Project |  |  |  |  |  |  |  |  |  |  |
Long Lived Assets Held-for-sale [Line Items] |  |  |  |  |  |  |  |  |  |  |
Ownership percentage |  |  |  |  | 56.00% |  |  |  |  | 56.00% |
Freeport Cobalt And Kisanfu Exploration Project |  |  |  |  |  |  |  |  |  |  |
Long Lived Assets Held-for-sale [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Disposition of Assets |  |  |  |  |  |  |  |  |  |  | $ 110
Freeport Cobalt |  |  |  |  |  |  |  |  |  |  |
Long Lived Assets Held-for-sale [Line Items] |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Assets Held-for-sale |  |  |  |  |  |  |  |  | 97 |  |
Property, plant, equipment and mine development costs, net | $ 60 |  |  |  |  |  |  |  | $ 60 |  |
Kisanfu Exploration Project | Restatement Adjustment |  |  |  |  |  |  |  |  |  |  |
Long Lived Assets Held-for-sale [Line Items] |  |  |  |  |  |  |  |  |  |  |
Deferred income taxes |  |  |  |  | $ 27 |  |  |  |  | $ 27 |
Property, plant, equipment and mine development costs, net |  |  |  |  | $ 90 |  |  |  |  | $ 90 |

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