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OTHER LIABILITIES, INCLUDING EMPLOYEE BENEFITS (Penion Plans) (Details) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 USD ($) Rp / $ | Dec. 31, 2017 USD ($) Rp / $ | Dec. 31, 2016 USD ($)
Domestic Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Benefit Obligation | $ 2,230 | $ 2,343 | $ 2,135
Discount rate | 4.40% | 3.70% | 4.40%
Expected return on plan assets | 6.50% |  |
Estimated future average expected rate of return on passively managed pension assets | 6.00% |  |
Estimated future average expected premium on actively managed pension assets | 0.50% |  |
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) | $ 124 | $ (188) |
Service cost | 44 | 44 | $ 27
Interest cost | 84 | 91 | 93
Defined Benefit Plan, Benefit Obligation, Foreign Currency Translation Gain (Loss) | 1 | (3) |
Defined Benefit Plan, Benefit Obligation, Special and Contractual Termination Benefits | 0 | 0 |
Defined Benefit Plan, Benefit Obligation, Benefits Paid | 120 | 118 |
Total pension plan net assets | 1,433 | 1,588 | 1,329
Actual return on plan assets | (104) | 230 |
Employer contributions | 70 | 145 |
Foreign exchange (losses) gains | (1) | 2 |
Defined Benefit Plan, Plan Assets, Benefits Paid | 120 | 118 |
Defined Benefit Plan, Funded (Unfunded) Status of Plan | (797) | (755) |
Accumulated benefit obligation | $ 2,101 | $ 2,218 |
Rate of compensation increase | 3.25% | 3.25% |
Other assets | $ 7 | $ 11 |
Accounts payable and accrued liabilities | 4 | 4 |
Liability, Defined Benefit Plan, Noncurrent | 800 | 762 |
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position | $ (797) | (755) |
Domestic Plan [Member] | Equity securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target allocation percentage of assets | 41.00% |  |
Domestic Plan [Member] | Fixed Income Investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target allocation percentage of assets | 51.00% |  |
Domestic Plan [Member] | Alternative Investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target allocation percentage of assets | 8.00% |  |
SERP |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Years of service required for annuity to equal percentage of executive's highest average compensation for any consecutive three-year period during the preceeding five years before retirement | 25 years |  |
Foreign Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Benefit Obligation | $ 220 | $ 240 | $ 374
Discount rate | 8.25% | 6.75% | 8.25%
Expected return on plan assets | 7.75% |  |
Foreign currency exchange rate | Rp / $ | 14,409 | 13,480 |
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) | $ 19 | $ 61 |
Service cost | 13 | 20 | $ 27
Interest cost | 14 | 23 | 29
Defined Benefit Plan, Benefit Obligation, Foreign Currency Translation Gain (Loss) | 15 | 2 |
Defined Benefit Plan, Benefit Obligation, Special and Contractual Termination Benefits | 0 | (62) |
Defined Benefit Plan, Benefit Obligation, Benefits Paid | 13 | 52 |
Total pension plan net assets | 238 | 269 | $ 284
Actual return on plan assets | (5) | 11 |
Employer contributions | 4 | 28 |
Foreign exchange (losses) gains | (17) | (2) |
Defined Benefit Plan, Plan Assets, Benefits Paid | 13 | 52 |
Defined Benefit Plan, Funded (Unfunded) Status of Plan | 18 | 29 |
Accumulated benefit obligation | $ 181 | $ 194 |
Rate of compensation increase | 4.00% | 4.00% |
Other assets | $ 18 | $ 29 |
Accounts payable and accrued liabilities | 0 | 0 |
Liability, Defined Benefit Plan, Noncurrent | 0 | 0 |
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position | 18 | 29 |
FCX [Member] | Pension Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Plan Amendment | 4 | 0 |
PT Freeport Indonesia, Subsidiary | Pension Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Plan Amendment | 0 | $ 0 |
Measurement Input, Census Data [Member] | Domestic Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) | (33) |  |
Measurement Input, Mortality Rate [Member] | Domestic Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) | (49) |  |
Measurement Input, Discount Rate [Member] | Domestic Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) | $ (205) |  |

X
- Definition The portion of the expected long-term rate of return on plan assets due to active management of the portfolio. + References No definition available. + Details
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- Definition The portion of the expected long-term rate of return on plan assets from the passive return on a compound basis. + References No definition available. + Details
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- Definition Years Of Service Required For Annuity To Equal Percentage Of Executive Highest Average Compensation For Three Year Period Or Five Years Before Retirement If Less + References No definition available. + Details
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- Definition Weighted average rate of return on plan assets, used to determine net periodic benefit cost (credit) of defined benefit plan, in subsequent interim measurement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e2919-114920 + Details
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- Definition Amount of payment to participant of defined benefit plan which decreases benefit obligation. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(6) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6414203&loc=d3e39716-114964 + Details
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