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OTHER LIABILITIES, INCLUDING EMPLOYEE BENEFITS (Schedule of FV of Financial Assets for Pension Plans) (Details) (Pension plan [Member], USD $) In Millions, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
--- | --- | --- | ---
FCX [Member] |  |  |  |  |
Fair value of plan assets measurement [Line items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | $ 1,350 |  | $ 1,300 |  | $ 1,141
Cash and Receivables In Plan Assets | 18 |  | 5 |  |
Payables In Plan Assets | (14) |  | (12) |  |
PT Freeport Indonesia [Member] |  |  |  |  |
Fair value of plan assets measurement [Line items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 124 |  | 130 |  | 107
Cash and Receivables In Plan Assets | 62 | [1] | 61 | [1] |
Investments [Member] | FCX [Member] |  |  |  |  |
Fair value of plan assets measurement [Line items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 1,346 |  | 1,307 |  |
Investments [Member] | FCX [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |
Fair value of plan assets measurement [Line items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 215 |  | 232 |  |
Investments [Member] | FCX [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |
Fair value of plan assets measurement [Line items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 1,041 |  | 989 |  |
Investments [Member] | FCX [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Fair value of plan assets measurement [Line items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 90 |  | 86 |  |
Investments [Member] | FCX [Member] | Commingled/collective funds [Member] | Global equity [Member] |  |  |  |  |
Fair value of plan assets measurement [Line items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 623 |  | 481 |  |
Investments [Member] | FCX [Member] | Commingled/collective funds [Member] | Global equity [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |
Fair value of plan assets measurement [Line items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0 |  | 0 |  |
Investments [Member] | FCX [Member] | Commingled/collective funds [Member] | Global equity [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |
Fair value of plan assets measurement [Line items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 623 |  | 481 |  |
Investments [Member] | FCX [Member] | Commingled/collective funds [Member] | Global equity [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Fair value of plan assets measurement [Line items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0 |  | 0 |  |
Investments [Member] | FCX [Member] | Commingled/collective funds [Member] | U.S. real estate securities [Member] |  |  |  |  |
Fair value of plan assets measurement [Line items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 40 |  | 61 |  |
Investments [Member] | FCX [Member] | Commingled/collective funds [Member] | U.S. real estate securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |
Fair value of plan assets measurement [Line items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0 |  | 0 |  |
Investments [Member] | FCX [Member] | Commingled/collective funds [Member] | U.S. real estate securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |
Fair value of plan assets measurement [Line items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 40 |  | 61 |  |
Investments [Member] | FCX [Member] | Commingled/collective funds [Member] | U.S. real estate securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Fair value of plan assets measurement [Line items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0 |  | 0 |  |
Investments [Member] | FCX [Member] | Commingled/collective funds [Member] | U.S. small-cap equity [Member] |  |  |  |  |
Fair value of plan assets measurement [Line items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 65 |  | 52 |  |
Investments [Member] | FCX [Member] | Commingled/collective funds [Member] | U.S. small-cap equity [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |
Fair value of plan assets measurement [Line items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0 |  | 0 |  |
Investments [Member] | FCX [Member] | Commingled/collective funds [Member] | U.S. small-cap equity [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |
Fair value of plan assets measurement [Line items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 65 |  | 52 |  |
Investments [Member] | FCX [Member] | Commingled/collective funds [Member] | U.S. small-cap equity [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Fair value of plan assets measurement [Line items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0 |  | 0 |  |
Investments [Member] | FCX [Member] | Commingled/collective funds [Member] | Real estate property [Member] |  |  |  |  |
Fair value of plan assets measurement [Line items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 47 |  | 41 |  |
Investments [Member] | FCX [Member] | Commingled/collective funds [Member] | Real estate property [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |
Fair value of plan assets measurement [Line items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0 |  | 0 |  |
Investments [Member] | FCX [Member] | Commingled/collective funds [Member] | Real estate property [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |
Fair value of plan assets measurement [Line items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0 |  | 0 |  |
Investments [Member] | FCX [Member] | Commingled/collective funds [Member] | Real estate property [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Fair value of plan assets measurement [Line items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 47 |  | 41 |  |
Investments [Member] | FCX [Member] | Commingled/collective funds [Member] | Short-term Investments [Member] |  |  |  |  |
Fair value of plan assets measurement [Line items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 5 |  | 40 |  |
Investments [Member] | FCX [Member] | Commingled/collective funds [Member] | Short-term Investments [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |
Fair value of plan assets measurement [Line items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0 |  | 0 |  |
Investments [Member] | FCX [Member] | Commingled/collective funds [Member] | Short-term Investments [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |
Fair value of plan assets measurement [Line items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 5 |  | 40 |  |
Investments [Member] | FCX [Member] | Commingled/collective funds [Member] | Short-term Investments [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Fair value of plan assets measurement [Line items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0 |  | 0 |  |
Investments [Member] | FCX [Member] | Open-ended mutual funds [Member] | Government bonds [Member] |  |  |  |  |
Fair value of plan assets measurement [Line items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 43 |  | 48 |  |
Investments [Member] | FCX [Member] | Open-ended mutual funds [Member] | Government bonds [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |
Fair value of plan assets measurement [Line items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 43 |  | 48 |  |
Investments [Member] | FCX [Member] | Open-ended mutual funds [Member] | Government bonds [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |
Fair value of plan assets measurement [Line items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0 |  | 0 |  |
Investments [Member] | FCX [Member] | Open-ended mutual funds [Member] | Government bonds [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Fair value of plan assets measurement [Line items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0 |  | 0 |  |
Investments [Member] | FCX [Member] | Open-ended mutual funds [Member] | Emerging markets equity [Member] |  |  |  |  |
Fair value of plan assets measurement [Line items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 41 |  | 41 |  |
Investments [Member] | FCX [Member] | Open-ended mutual funds [Member] | Emerging markets equity [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |
Fair value of plan assets measurement [Line items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 41 |  | 41 |  |
Investments [Member] | FCX [Member] | Open-ended mutual funds [Member] | Emerging markets equity [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |
Fair value of plan assets measurement [Line items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0 |  | 0 |  |
Investments [Member] | FCX [Member] | Open-ended mutual funds [Member] | Emerging markets equity [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Fair value of plan assets measurement [Line items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0 |  | 0 |  |
Investments [Member] | FCX [Member] | Open-ended mutual funds [Member] | Corporate bonds [Member] |  |  |  |  |
Fair value of plan assets measurement [Line items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 33 |  | 23 |  |
Investments [Member] | FCX [Member] | Open-ended mutual funds [Member] | Corporate bonds [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |
Fair value of plan assets measurement [Line items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 33 |  | 23 |  |
Investments [Member] | FCX [Member] | Open-ended mutual funds [Member] | Corporate bonds [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |
Fair value of plan assets measurement [Line items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0 |  | 0 |  |
Investments [Member] | FCX [Member] | Open-ended mutual funds [Member] | Corporate bonds [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Fair value of plan assets measurement [Line items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0 |  | 0 |  |
Investments [Member] | FCX [Member] | Mutual funds [Member] | Emerging markets equity [Member] |  |  |  |  |
Fair value of plan assets measurement [Line items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 26 |  | 28 |  |
Investments [Member] | FCX [Member] | Mutual funds [Member] | Emerging markets equity [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |
Fair value of plan assets measurement [Line items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 26 |  | 28 |  |
Investments [Member] | FCX [Member] | Mutual funds [Member] | Emerging markets equity [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |
Fair value of plan assets measurement [Line items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0 |  | 0 |  |
Investments [Member] | FCX [Member] | Mutual funds [Member] | Emerging markets equity [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Fair value of plan assets measurement [Line items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0 |  | 0 |  |
Investments [Member] | FCX [Member] | Mutual funds [Member] | Foreign bonds [Member] |  |  |  |  |
Fair value of plan assets measurement [Line items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 51 |  | 54 |  |
Investments [Member] | FCX [Member] | Mutual funds [Member] | Foreign bonds [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |
Fair value of plan assets measurement [Line items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 51 |  | 54 |  |
Investments [Member] | FCX [Member] | Mutual funds [Member] | Foreign bonds [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |
Fair value of plan assets measurement [Line items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0 |  | 0 |  |
Investments [Member] | FCX [Member] | Mutual funds [Member] | Foreign bonds [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Fair value of plan assets measurement [Line items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0 |  | 0 |  |
Investments [Member] | FCX [Member] | Mutual funds [Member] | Emerging markets bonds [Member] |  |  |  |  |
Fair value of plan assets measurement [Line items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 20 |  | 37 |  |
Investments [Member] | FCX [Member] | Mutual funds [Member] | Emerging markets bonds [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |
Fair value of plan assets measurement [Line items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 20 |  | 37 |  |
Investments [Member] | FCX [Member] | Mutual funds [Member] | Emerging markets bonds [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |
Fair value of plan assets measurement [Line items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0 |  | 0 |  |
Investments [Member] | FCX [Member] | Mutual funds [Member] | Emerging markets bonds [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Fair value of plan assets measurement [Line items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0 |  | 0 |  |
Investments [Member] | FCX [Member] | Fixed income securities [Member] | Government bonds [Member] |  |  |  |  |
Fair value of plan assets measurement [Line items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 198 |  | 241 |  |
Investments [Member] | FCX [Member] | Fixed income securities [Member] | Government bonds [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |
Fair value of plan assets measurement [Line items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0 |  | 0 |  |
Investments [Member] | FCX [Member] | Fixed income securities [Member] | Government bonds [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |
Fair value of plan assets measurement [Line items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 198 |  | 241 |  |
Investments [Member] | FCX [Member] | Fixed income securities [Member] | Government bonds [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Fair value of plan assets measurement [Line items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0 |  | 0 |  |
Investments [Member] | FCX [Member] | Fixed income securities [Member] | Corporate bonds [Member] |  |  |  |  |
Fair value of plan assets measurement [Line items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 52 |  | 82 |  |
Investments [Member] | FCX [Member] | Fixed income securities [Member] | Corporate bonds [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |
Fair value of plan assets measurement [Line items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0 |  | 0 |  |
Investments [Member] | FCX [Member] | Fixed income securities [Member] | Corporate bonds [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |
Fair value of plan assets measurement [Line items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 52 |  | 82 |  |
Investments [Member] | FCX [Member] | Fixed income securities [Member] | Corporate bonds [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Fair value of plan assets measurement [Line items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0 |  | 0 |  |
Investments [Member] | FCX [Member] | Private equity investments [Member] | Private equity investments [Member] |  |  |  |  |
Fair value of plan assets measurement [Line items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 43 |  | 45 |  |
Investments [Member] | FCX [Member] | Private equity investments [Member] | Private equity investments [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |
Fair value of plan assets measurement [Line items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0 |  | 0 |  |
Investments [Member] | FCX [Member] | Private equity investments [Member] | Private equity investments [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |
Fair value of plan assets measurement [Line items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0 |  | 0 |  |
Investments [Member] | FCX [Member] | Private equity investments [Member] | Private equity investments [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Fair value of plan assets measurement [Line items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 43 |  | 45 |  |
Investments [Member] | FCX [Member] | Other investments [Member] | Other investments [Member] |  |  |  |  |
Fair value of plan assets measurement [Line items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 29 |  | 33 |  |
Investments [Member] | FCX [Member] | Other investments [Member] | Other investments [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |
Fair value of plan assets measurement [Line items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 1 |  | 1 |  |
Investments [Member] | FCX [Member] | Other investments [Member] | Other investments [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |
Fair value of plan assets measurement [Line items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 28 |  | 32 |  |
Investments [Member] | FCX [Member] | Other investments [Member] | Other investments [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Fair value of plan assets measurement [Line items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0 |  | 0 |  |
Investments [Member] | PT Freeport Indonesia [Member] |  |  |  |  |
Fair value of plan assets measurement [Line items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 62 |  | 69 |  |
Investments [Member] | PT Freeport Indonesia [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |
Fair value of plan assets measurement [Line items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 62 |  | 69 |  |
Investments [Member] | PT Freeport Indonesia [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |
Fair value of plan assets measurement [Line items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0 |  | 0 |  |
Investments [Member] | PT Freeport Indonesia [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Fair value of plan assets measurement [Line items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0 |  | 0 |  |
Investments [Member] | PT Freeport Indonesia [Member] | Government bonds [Member] |  |  |  |  |
Fair value of plan assets measurement [Line items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 23 |  | 27 |  |
Investments [Member] | PT Freeport Indonesia [Member] | Government bonds [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |
Fair value of plan assets measurement [Line items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 23 |  | 27 |  |
Investments [Member] | PT Freeport Indonesia [Member] | Government bonds [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |
Fair value of plan assets measurement [Line items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0 |  | 0 |  |
Investments [Member] | PT Freeport Indonesia [Member] | Government bonds [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Fair value of plan assets measurement [Line items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0 |  | 0 |  |
Investments [Member] | PT Freeport Indonesia [Member] | Common stocks [Member] |  |  |  |  |
Fair value of plan assets measurement [Line items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 27 |  | 32 |  |
Investments [Member] | PT Freeport Indonesia [Member] | Common stocks [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |
Fair value of plan assets measurement [Line items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 27 |  | 32 |  |
Investments [Member] | PT Freeport Indonesia [Member] | Common stocks [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |
Fair value of plan assets measurement [Line items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0 |  | 0 |  |
Investments [Member] | PT Freeport Indonesia [Member] | Common stocks [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Fair value of plan assets measurement [Line items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0 |  | 0 |  |
Investments [Member] | PT Freeport Indonesia [Member] | Mutual funds [Member] |  |  |  |  |
Fair value of plan assets measurement [Line items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 12 |  | 10 |  |
Investments [Member] | PT Freeport Indonesia [Member] | Mutual funds [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |
Fair value of plan assets measurement [Line items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 12 |  | 10 |  |
Investments [Member] | PT Freeport Indonesia [Member] | Mutual funds [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |
Fair value of plan assets measurement [Line items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0 |  | 0 |  |
Investments [Member] | PT Freeport Indonesia [Member] | Mutual funds [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Fair value of plan assets measurement [Line items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | $ 0 |  | $ 0 |  |
[1] | Cash consisted primarily of short-term time deposits.

X
- Definition Cash and Receivables In Plan Assets + References No definition available. + Details
Name: | fcx_CashAndReceivablesInPlanAssets
Namespace Prefix: | fcx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | fcx_FairValueOfPlanAssetsMeasurementLineItems
Namespace Prefix: | fcx_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Payables In Plan Assets + References No definition available. + Details
Name: | fcx_PayablesInPlanAssets
Namespace Prefix: | fcx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Section 35 -Paragraph 50 -URI http://asc.fasb.org/extlink&oid=29635418&loc=d3e12355-114930 + Details
Name: | us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant