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STOCKHOLDERS' EQUITY AND STOCK-BASED COMPENSATION (Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Cumulative Effect of New Accounting Principle in Period of Adoption | $ 0 |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Beginning balance, stockholders' equity | 7,977 |  |
Actuarial (losses) gains arising during the period, net of taxes | 77 | $ (14) | $ 88
Ending balance, stockholders' equity | 9,798 | 7,977 |
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] |  |  |
Cumulative Effect of New Accounting Principle in Period of Adoption | (79) |  |
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), after Reclassification Adjustment, before Tax | (87) | 52 | (79)
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Beginning balance, stockholders' equity | (494) | (554) | (507)
OCI, before Reclassifications, Net of Tax, Attributable to Parent | (84) | 7 | (91)
Other Comprehensive Income (Loss), Reclassification, Pension and Other Postretirement Benefit Plans, Net Gain (Loss) Recognized in Net Periodic Benefit Cost, Net of Tax | 48 | 53 | 44
Ending balance, stockholders' equity | (615) | (494) | (554)
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member] |  |  |
Cumulative Effect of New Accounting Principle in Period of Adoption | 0 |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Beginning balance, stockholders' equity | (3) | (4) | (6)
OCI, before Reclassifications, Net of Tax, Attributable to Parent | 0 | 1 | 2
Other Comprehensive Income (Loss), Reclassification, Pension and Other Postretirement Benefit Plans, Net Gain (Loss) Recognized in Net Periodic Benefit Cost, Net of Tax | 3 | 0 | 0
Ending balance, stockholders' equity | 0 | (3) | (4)
Accumulated Foreign Currency Adjustment Attributable to Parent [Member] |  |  |
Cumulative Effect of New Accounting Principle in Period of Adoption | 0 |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Beginning balance, stockholders' equity | 10 | 10 | 10
OCI, before Reclassifications, Net of Tax, Attributable to Parent | 0 | 0 | 0
Other Comprehensive Income (Loss), Reclassification, Pension and Other Postretirement Benefit Plans, Net Gain (Loss) Recognized in Net Periodic Benefit Cost, Net of Tax | 0 | 0 | 0
Ending balance, stockholders' equity | 10 | 10 | 10
Accumulated Other Comprehensive Loss |  |  |
Cumulative Effect of New Accounting Principle in Period of Adoption | (79) |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Beginning balance, stockholders' equity | (487) | (548) | (503)
OCI, before Reclassifications, Net of Tax, Attributable to Parent | (84) | 8 | (89)
Other Comprehensive Income (Loss), Reclassification, Pension and Other Postretirement Benefit Plans, Net Gain (Loss) Recognized in Net Periodic Benefit Cost, Net of Tax | 51 | 53 | 44
Ending balance, stockholders' equity | (605) | (487) | (548)
Accumulated Defined Benefit Plans Adjustment Attributable to Noncontrolling Interest [Member] |  |  |
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent | 4 | 45 | 11
Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent [Member] |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Other Comprehensive Income (Loss), Reclassification, Pension and Other Postretirement Benefit Plans, Net Gain (Loss) Recognized in Net Periodic Benefit Cost, Net of Tax | 0 | $ (5) | $ (4)
PT Freeport Indonesia [Member] | Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Actuarial (losses) gains arising during the period, net of taxes | (6) |  |
PT Freeport Indonesia [Member] | Accumulated Net Investment Gain (Loss) Attributable to Parent [Member] |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Actuarial (losses) gains arising during the period, net of taxes | 0 |  |
PT Freeport Indonesia [Member] | Accumulated Foreign Currency Adjustment Attributable to Parent [Member] |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Actuarial (losses) gains arising during the period, net of taxes | 0 |  |
PT Freeport Indonesia [Member] | Accumulated Other Comprehensive Loss |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Actuarial (losses) gains arising during the period, net of taxes | $ (6) |  |

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