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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, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Long Lived Assets Held-for-sale [Line Items] |  |  |  |  |  |  |
Net gain on sales of assets | $ 82 | $ 70 | $ 45 | $ 11 | $ 417 | $ 208 | $ 81
Deferred income taxes | 4,032 |  |  |  | 4,210 | 4,032 |
Property, plant, equipment and mine development costs, net | 28,010 |  |  |  | 29,584 | 28,010 |
Depreciation, depletion and amortization |  |  |  |  | $ 1,412 | 1,754 | $ 1,714
Freeport Cobalt |  |  |  |  |  |  |
Long Lived Assets Held-for-sale [Line Items] |  |  |  |  |  |  |
Depreciation Expense on Reclassified Assets | $ 48 |  |  |  |  | $ 31 |

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