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CONTINGENCIES (Oil and Gas Properties) (Details) $ in Millions | Dec. 31, 2017 USD ($) platform well | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($)
--- | --- | --- | --- | ---
Loss Contingencies [Line Items] |  |  |  |
ARO, noncurrent | $ 2,580 | $ 2,635 | $ 2,771 | $ 2,744
Freeport-McMoRan Oil & Gas |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Number of productive oil wells | well | 250 |  |  |
Number of platforms and other structures | platform | 140 |  |  |
ARO, noncurrent | $ 553 |  |  |

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