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STOCKHOLDERS' EQUITY AND STOCK-BASED COMPENSATION (Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Beginning balance, stockholders' equity | $ 9,798 |  |
Ending balance, stockholders' equity | 9,298 | $ 9,798 |
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 | (111) | (87) | $ 52
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Beginning balance, stockholders' equity | (615) | (494) | (554)
OCI, before Reclassifications, Net of Tax, Attributable to Parent | (118) | (84) | 7
Other Comprehensive Income (Loss), Reclassification, Pension and Other Postretirement Benefit Plans, Net Gain (Loss) Recognized in Net Periodic Benefit Cost, Net of Tax | 47 | 48 | 53
Ending balance, stockholders' equity | (686) | (615) | (494)
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, 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 | 0 | (3) | (4)
OCI, before Reclassifications, Net of Tax, Attributable to Parent | 0 | 0 | 1
Other Comprehensive Income (Loss), Reclassification, Pension and Other Postretirement Benefit Plans, Net Gain (Loss) Recognized in Net Periodic Benefit Cost, Net of Tax | 0 | 3 | 0
Ending balance, stockholders' equity | 0 | 0 | (3)
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 | (605) | (487) | (548)
OCI, before Reclassifications, Net of Tax, Attributable to Parent | (118) | (84) | 8
Other Comprehensive Income (Loss), Reclassification, Pension and Other Postretirement Benefit Plans, Net Gain (Loss) Recognized in Net Periodic Benefit Cost, Net of Tax | 47 | 51 | 53
Ending balance, stockholders' equity | (676) | (605) | (487)
Accumulated Defined Benefit Plans Adjustment Attributable to Noncontrolling Interest [Member] |  |  |
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent | 8 | (4) | (45)
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 | 0 | $ (5)
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] | AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, 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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