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DEBT (Details)				1 Months Ended				12 Months Ended
	Sep. 30, 2018	Mar. 31, 2018	Sep. 30, 2017	Nov. 30, 2013 USD ($)	May 31, 2013 USD ($)	Mar. 30, 2013 USD ($)	Feb. 29, 2012 USD ($)	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016 USD ($) payment	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 30, 2016 USD ($)	May 31, 2016 USD ($)	Nov. 30, 2014 USD ($)	May 31, 2014 USD ($)	Mar. 31, 2013 USD ($)	Mar. 07, 2013 USD ($)	Feb. 28, 2012 USD ($)
Debt Instruments [Line Items]
Liabilities, Fair Value Adjustment										$ 179,000,000	$ 210,000,000
Long-term Debt													$ 2,228,000,000
Long-term Debt and Capital Lease Obligations, Including Current Maturities										16,027,000,000	20,324,000,000
Less current portion of long-term debt and short-term borrownings										(1,232,000,000)	(649,000,000)
Long-term debt										14,795,000,000	19,675,000,000
Cerro Verde [Abstract]
Extinguishment of Debt, Principal Amount													2,342,000,000
Senior Notes Issued by FCX [Abstract]
Principal Amount of Senior Notes Tendered													2,091,000,000
Exchanges and Early Extinguishment of Debt [Abstract]
Debt Issuance Costs, Gross										100,000,000	129,000,000
Net gain (loss) on early extinguishment of debt										(26,000,000)	0	$ (73,000,000)
Long-term Debt, by Maturity [Abstract]
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months										1,200,000,000
Long-term Debt, Maturities, Repayments of Principal in Year Two										2,300,000,000
Long-term Debt, Maturities, Repayments of Principal in Year Three										1,100,000,000
Long-term Debt, Maturities, Repayments of Principal in Year Four										1,600,000,000
Long-term Debt, Maturities, Repayments of Principal in Year Five										862,000,000
Long-term Debt, Maturities, Repayments of Principal in Rolling after Year Five										8,800,000,000
Bank Term Loan [Member]
Debt Instruments [Line Items]
Long-term Debt										0	3,032,000,000
Bank Term Loan [Abstract]
Borrowings from Shareholder Loan												4,000,000,000
Cerro Verde [Abstract]
Extinguishment of Debt, Principal Amount																	$ 4,000,000,000.0
Senior Notes [Member]
Debt Instruments [Line Items]
Liabilities, Fair Value Adjustment										151,000,000
Cerro Verde [Abstract]
Extinguishment of Debt, Principal Amount										$ 407,000,000		4,208,000,000						$ 6,500,000,000.0
Senior Notes Issued by FCX [Abstract]
Percentage of FM O&G LLC senior notes tendered for new FCX senior notes										89.00%
Proceeds from Issuance of Long-term Debt				$ 2,970,000,000		$ 6,400,000,000	$ 2,470,000,000
Cash										$ 14,000,000
Exchanges and Early Extinguishment of Debt [Abstract]
Debt Issuance Costs, Gross										4,000,000
Extinguishment of Debt, Amount										403,000,000		4,572,000,000
Extinguishment Of Debt, Redemption Value										349,000,000		4,495,000,000
Net gain (loss) on early extinguishment of debt										(54,000,000)
Losses related to deferred debt issuance costs and senior note exchange offer										28,000,000
Extinguishment of Debt, Purchase Accounting Adjustments												364,000,000
Other Debt, Including Capital Leases and Short Term Borrowings [Member]
Debt Instruments [Line Items]
Long-term Debt and Capital Lease Obligations, Including Current Maturities										$ 5,000,000	4,000,000
Revolving Credit Facility [Member] | Senior Notes [Member]
Exchanges and Early Extinguishment of Debt [Abstract]
Net gain (loss) on early extinguishment of debt												(77,000,000)
Losses primarily associated with modification of credit facility												4,000,000
6.125% Senior Notes due 2019 [Member] [Member] | Senior Notes [Member]
Debt Instruments [Line Items]
Long-term Debt													186,000,000
Cerro Verde [Abstract]
Extinguishment of Debt, Principal Amount													237,000,000
Senior Notes Issued by FCX [Abstract]
Principal Amount of Senior Notes Tendered													179,000,000
Senior Notes Due 2015 1 Point 40 Percent [Member] | Senior Notes [Member]
Cerro Verde [Abstract]
Extinguishment of Debt, Principal Amount												500,000,000
Senior Notes Issued by FCX [Abstract]
Debt Instrument, Interest Rate, Stated Percentage										1.40%
Exchanges and Early Extinguishment of Debt [Abstract]
Extinguishment of Debt, Amount												500,000,000
Extinguishment Of Debt, Redemption Value												501,000,000
Net gain (loss) on early extinguishment of debt												1,000,000
Extinguishment of Debt, Purchase Accounting Adjustments												0
2.15% Senior Notes due 2017 [Member] | Senior Notes [Member]
Debt Instruments [Line Items]
Long-term Debt										$ 500,000,000	499,000,000
Cerro Verde [Abstract]
Extinguishment of Debt, Principal Amount																			$ 500,000,000
Senior Notes Issued by FCX [Abstract]
Debt Instrument, Interest Rate, Stated Percentage										2.15%									2.15%
2.30% Senior Notes due 2017 [Member] | Senior Notes [Member]
Debt Instruments [Line Items]
Long-term Debt										$ 728,000,000	747,000,000
Cerro Verde [Abstract]
Extinguishment of Debt, Principal Amount										$ 20,000,000					$ 750,000,000
Senior Notes Issued by FCX [Abstract]
Debt Instrument, Interest Rate, Stated Percentage										2.30%					2.30%
Exchanges and Early Extinguishment of Debt [Abstract]
Debt Issuance Costs, Gross										$ 0
Extinguishment of Debt, Amount										20,000,000
Extinguishment Of Debt, Redemption Value										20,000,000
Net gain (loss) on early extinguishment of debt										0
2.375% Senior Notes due March 2018 [Member] | Senior Notes [Member]
Debt Instruments [Line Items]
Long-term Debt										1,480,000,000	1,495,000,000
Cerro Verde [Abstract]
Extinguishment of Debt, Principal Amount										$ 18,000,000								$ 1,500,000,000.0
Senior Notes Issued by FCX [Abstract]
Debt Instrument, Interest Rate, Stated Percentage										2.375%								2.375%
Exchanges and Early Extinguishment of Debt [Abstract]
Debt Issuance Costs, Gross										$ 0
Extinguishment of Debt, Amount										18,000,000
Extinguishment Of Debt, Redemption Value										18,000,000
Net gain (loss) on early extinguishment of debt										0
6.125% Senior Notes due 2019 [Member] | Senior Notes [Member]
Debt Instruments [Line Items]
Long-term Debt										186,000,000	0
Cerro Verde [Abstract]
Extinguishment of Debt, Principal Amount												513,000,000
Exchanges and Early Extinguishment of Debt [Abstract]
Extinguishment of Debt, Amount												553,000,000
Extinguishment Of Debt, Redemption Value												555,000,000
Net gain (loss) on early extinguishment of debt												2,000,000
Extinguishment of Debt, Purchase Accounting Adjustments												40,000,000
3.100% Senior Notes due March 2020 [Member] | Senior Notes [Member]
Debt Instruments [Line Items]
Long-term Debt										$ 996,000,000	995,000,000		242,000,000
Cerro Verde [Abstract]
Extinguishment of Debt, Principal Amount													261,000,000					$ 1,000,000,000.0
Senior Notes Issued by FCX [Abstract]
Debt Instrument, Interest Rate, Stated Percentage										3.10%								3.10%
Principal Amount of Senior Notes Tendered													228,000,000
6.5% Senior Notes due 2020 [Member] | Senior Notes [Member]
Debt Instruments [Line Items]
Long-term Debt										$ 583,000,000	0		583,000,000
Cerro Verde [Abstract]
Extinguishment of Debt, Principal Amount												883,000,000	617,000,000
Senior Notes Issued by FCX [Abstract]
Principal Amount of Senior Notes Tendered													552,000,000
Exchanges and Early Extinguishment of Debt [Abstract]
Extinguishment of Debt, Amount												962,000,000
Extinguishment Of Debt, Redemption Value												952,000,000
Net gain (loss) on early extinguishment of debt												(10,000,000)
Extinguishment of Debt, Purchase Accounting Adjustments												79,000,000
6.625% Senior Notes due 2021 [Member] | Senior Notes [Member]
Debt Instruments [Line Items]
Long-term Debt										242,000,000	0
Cerro Verde [Abstract]
Extinguishment of Debt, Principal Amount												339,000,000
Exchanges and Early Extinguishment of Debt [Abstract]
Extinguishment of Debt, Amount												370,000,000
Extinguishment Of Debt, Redemption Value												367,000,000
Net gain (loss) on early extinguishment of debt												(3,000,000)
Extinguishment of Debt, Purchase Accounting Adjustments												31,000,000
4.00% Senior Notes due 2021 [Member] | Senior Notes [Member]
Debt Instruments [Line Items]
Long-term Debt										$ 595,000,000	594,000,000
Cerro Verde [Abstract]
Extinguishment of Debt, Principal Amount															$ 600,000,000
Senior Notes Issued by FCX [Abstract]
Debt Instrument, Interest Rate, Stated Percentage										4.00%					4.00%
6.75% Senior Notes due 2022 [Member] | Senior Notes [Member]
Debt Instruments [Line Items]
Long-term Debt										$ 432,000,000	0		432,000,000
Cerro Verde [Abstract]
Extinguishment of Debt, Principal Amount												551,000,000	449,000,000
Senior Notes Issued by FCX [Abstract]
Principal Amount of Senior Notes Tendered													404,000,000
Exchanges and Early Extinguishment of Debt [Abstract]
Extinguishment of Debt, Amount												608,000,000
Extinguishment Of Debt, Redemption Value												600,000,000
Net gain (loss) on early extinguishment of debt												(8,000,000)
Extinguishment of Debt, Purchase Accounting Adjustments												57,000,000
3.55% Senior Notes due 2022 [Member] | Senior Notes [Member]
Debt Instruments [Line Items]
Long-term Debt										1,882,000,000	1,987,000,000
Cerro Verde [Abstract]
Extinguishment of Debt, Principal Amount										$ 108,000,000									$ 2,000,000,000
Senior Notes Issued by FCX [Abstract]
Debt Instrument, Interest Rate, Stated Percentage										3.55%									3.55%
Exchanges and Early Extinguishment of Debt [Abstract]
Debt Issuance Costs, Gross										$ 1,000,000
Extinguishment of Debt, Amount										107,000,000
Extinguishment Of Debt, Redemption Value										96,000,000
Net gain (loss) on early extinguishment of debt										(11,000,000)
6.875% Senior Notes due 2023 [Member] | Senior Notes [Member]
Debt Instruments [Line Items]
Long-term Debt										784,000,000	0		785,000,000
Cerro Verde [Abstract]
Extinguishment of Debt, Principal Amount												722,000,000	778,000,000
Senior Notes Issued by FCX [Abstract]
Principal Amount of Senior Notes Tendered													$ 728,000,000
Exchanges and Early Extinguishment of Debt [Abstract]
Extinguishment of Debt, Amount												806,000,000
Extinguishment Of Debt, Redemption Value												785,000,000
Net gain (loss) on early extinguishment of debt												(21,000,000)
Extinguishment of Debt, Purchase Accounting Adjustments												84,000,000
3.875% Senior Notes due March 2023 [Member] | Senior Notes [Member]
Debt Instruments [Line Items]
Long-term Debt										1,912,000,000	1,987,000,000
Cerro Verde [Abstract]
Extinguishment of Debt, Principal Amount										$ 77,000,000								$ 2,000,000,000.0
Senior Notes Issued by FCX [Abstract]
Debt Instrument, Interest Rate, Stated Percentage										3.875%								3.875%
Exchanges and Early Extinguishment of Debt [Abstract]
Debt Issuance Costs, Gross										$ 0
Extinguishment of Debt, Amount										77,000,000
Extinguishment Of Debt, Redemption Value										68,000,000
Net gain (loss) on early extinguishment of debt										(9,000,000)
4.55% Senior Notes due 2024 [Member] | Senior Notes [Member]
Debt Instruments [Line Items]
Long-term Debt										$ 844,000,000	843,000,000
Cerro Verde [Abstract]
Extinguishment of Debt, Principal Amount															$ 850,000,000
Senior Notes Issued by FCX [Abstract]
Debt Instrument, Interest Rate, Stated Percentage										4.55%					4.55%
5.40% Senior Notes due 2034 [Member] | Senior Notes [Member]
Debt Instruments [Line Items]
Long-term Debt										$ 739,000,000	788,000,000
Cerro Verde [Abstract]
Extinguishment of Debt, Principal Amount										$ 50,000,000					$ 800,000,000
Senior Notes Issued by FCX [Abstract]
Debt Instrument, Interest Rate, Stated Percentage										5.40%					5.40%
Exchanges and Early Extinguishment of Debt [Abstract]
Debt Issuance Costs, Gross										$ 1,000,000
Extinguishment of Debt, Amount										49,000,000
Extinguishment Of Debt, Redemption Value										41,000,000
Net gain (loss) on early extinguishment of debt										(8,000,000)
5.450% Senior Notes due March 2043 [Member] | Senior Notes [Member]
Debt Instruments [Line Items]
Long-term Debt										1,842,000,000	1,973,000,000
Cerro Verde [Abstract]
Extinguishment of Debt, Principal Amount										$ 134,000,000								$ 2,000,000,000.0
Senior Notes Issued by FCX [Abstract]
Debt Instrument, Interest Rate, Stated Percentage										5.45%								5.45%
Exchanges and Early Extinguishment of Debt [Abstract]
Debt Issuance Costs, Gross										$ 2,000,000
Extinguishment of Debt, Amount										132,000,000
Extinguishment Of Debt, Redemption Value										106,000,000
Net gain (loss) on early extinguishment of debt										$ (26,000,000)
7.125% Debentures due 2027 [Member] | Debentures [Member]
Senior Notes Issued by FCX [Abstract]
Debt Instrument, Interest Rate, Stated Percentage										7.125%
9.5% Senior Notes due 2031 [Member] | Senior Notes [Member]
Senior Notes Issued by FCX [Abstract]
Debt Instrument, Interest Rate, Stated Percentage										9.50%
6.125% Senior Notes due 2034 [Member] | Senior Notes [Member]
Senior Notes Issued by FCX [Abstract]
Debt Instrument, Interest Rate, Stated Percentage										6.125%
8.625% Senior Notes due 2019 [Member] | Senior Notes [Member]
Cerro Verde [Abstract]
Extinguishment of Debt, Principal Amount												400,000,000
Exchanges and Early Extinguishment of Debt [Abstract]
Extinguishment of Debt, Amount												441,000,000
Extinguishment Of Debt, Redemption Value												417,000,000
Net gain (loss) on early extinguishment of debt												(24,000,000)
Extinguishment of Debt, Purchase Accounting Adjustments												41,000,000
7.625% Senior Notes due 2020 [Member] | Senior Notes [Member]
Cerro Verde [Abstract]
Extinguishment of Debt, Principal Amount												300,000,000
Exchanges and Early Extinguishment of Debt [Abstract]
Extinguishment of Debt, Amount												332,000,000
Extinguishment Of Debt, Redemption Value												318,000,000
Net gain (loss) on early extinguishment of debt												(14,000,000)
Extinguishment of Debt, Purchase Accounting Adjustments												32,000,000
Cerro Verde | Shareholder Loan [Member]
Debt Instruments [Line Items]
Long-term Debt										$ 261,000,000	259,000,000
Cerro Verde [Abstract]
Debt, Weighted Average Interest Rate										3.10%
Extinguishment of Debt, Principal Amount										$ 800,000,000
Freeport-McMoRan Oil & Gas | Senior Notes [Member]
Debt Instruments [Line Items]
Liabilities, Fair Value Adjustment					$ 716,000,000					16,000,000
Cerro Verde [Abstract]
Extinguishment of Debt, Principal Amount					6,400,000,000.0					251,000,000
Freeport-McMoRan Oil & Gas | 6.125% Senior Notes due 2019 [Member] | Senior Notes [Member]
Debt Instruments [Line Items]
Long-term Debt										60,000,000	251,000,000
Freeport-McMoRan Oil & Gas | 6.5% Senior Notes due 2020 [Member] | Senior Notes [Member]
Debt Instruments [Line Items]
Long-term Debt										69,000,000	662,000,000
Freeport-McMoRan Oil & Gas | 6.625% Senior Notes due 2021 [Member] | Senior Notes [Member]
Debt Instruments [Line Items]
Long-term Debt										35,000,000	281,000,000
Freeport-McMoRan Oil & Gas | 6.75% Senior Notes due 2022 [Member] | Senior Notes [Member]
Debt Instruments [Line Items]
Long-term Debt										48,000,000	488,000,000
Freeport-McMoRan Oil & Gas | 6.875% Senior Notes due 2023 [Member] | Senior Notes [Member]
Debt Instruments [Line Items]
Long-term Debt										55,000,000	857,000,000
Freeport McMoRan Corporation [Member] | 7.125% Debentures due 2027 [Member] | Debentures [Member]
Debt Instruments [Line Items]
Long-term Debt										115,000,000	115,000,000
Freeport McMoRan Corporation [Member] | 9.5% Senior Notes due 2031 [Member] | Senior Notes [Member]
Debt Instruments [Line Items]
Long-term Debt										128,000,000	128,000,000
Freeport McMoRan Corporation [Member] | 6.125% Senior Notes due 2034 [Member] | Senior Notes [Member]
Debt Instruments [Line Items]
Long-term Debt										$ 116,000,000	116,000,000
Plains Exploration & Production Company [Member] | 6.125% Senior Notes due 2019 [Member] | Senior Notes [Member]
Senior Notes Issued by FCX [Abstract]
Debt Instrument, Interest Rate, Stated Percentage										6.125%
Plains Exploration & Production Company [Member] | 6.5% Senior Notes due 2020 [Member] | Senior Notes [Member]
Senior Notes Issued by FCX [Abstract]
Debt Instrument, Interest Rate, Stated Percentage										6.50%
Plains Exploration & Production Company [Member] | 6.625% Senior Notes due 2021 [Member] | Senior Notes [Member]
Senior Notes Issued by FCX [Abstract]
Debt Instrument, Interest Rate, Stated Percentage										6.625%
Plains Exploration & Production Company [Member] | 6.75% Senior Notes due 2022 [Member] | Senior Notes [Member]
Senior Notes Issued by FCX [Abstract]
Debt Instrument, Interest Rate, Stated Percentage										6.75%
Plains Exploration & Production Company [Member] | 6.875% Senior Notes due 2023 [Member] | Senior Notes [Member]
Senior Notes Issued by FCX [Abstract]
Debt Instrument, Interest Rate, Stated Percentage										6.875%
Plains Exploration & Production Company [Member] | 7.625% Senior Notes due 2018 [Member] | Senior Notes [Member]
Senior Notes Issued by FCX [Abstract]
Debt Instrument, Interest Rate, Stated Percentage										7.625%
Plains Exploration & Production Company [Member] | 8.625% Senior Notes due 2019 [Member] | Senior Notes [Member]
Senior Notes Issued by FCX [Abstract]
Debt Instrument, Interest Rate, Stated Percentage										8.625%
Plains Exploration & Production Company [Member] | 7.625% Senior Notes due 2020 [Member] | Senior Notes [Member]
Senior Notes Issued by FCX [Abstract]
Debt Instrument, Interest Rate, Stated Percentage										7.625%
McMoRan Exploration Co [Member] | 11.875% Senior Notes due 2014 [Member] | Senior Notes [Member]
Senior Notes Issued by FCX [Abstract]
Debt Instrument, Interest Rate, Stated Percentage										11.875%
McMoRan Exploration Co [Member] | 4% Convertible Senior Notes due 2017 [Member] | Senior Notes [Member]
Senior Notes Issued by FCX [Abstract]
Debt Instrument, Interest Rate, Stated Percentage										4.00%
LIBOR Plus Spread [Member] | Cerro Verde | Shareholder Loan [Member]
Cerro Verde [Abstract]
Debt Instrument, Additional Rate, Above Basis Spread on Variable Rate										0.50%
Line of Credit [Member] | Line of Credit [Member]
Debt Instruments [Line Items]
Long-term Debt										$ 0	442,000,000
Line of Credit [Member] | Cerro Verde | Line of Credit [Member]
Debt Instruments [Line Items]
Long-term Debt										1,390,000,000	1,781,000,000
Revolving Credit Facility [Abstract]
Revolving Credit Facility, Maximum Borrowing Capacity										$ 1,800,000,000.0
Cerro Verde [Abstract]
Term of Debt Agreement										5 years
Debt Instrument, Interest Rate, Effective Percentage										2.67%
Number of Installment Payments under Installment Program | payment										4
Line of Credit [Member] | London Interbank Offered Rate (LIBOR) [Member] | Cerro Verde | Line of Credit [Member]
Revolving Credit Facility [Abstract]
Debt Instrument, Basis Spread on Variable Rate										1.90%
Letter of Credit [Member] | Line of Credit [Member]
Revolving Credit Facility [Abstract]
Long-term Line of Credit										$ 43,000,000
Revolving Credit Facility, Remaining Borrowing Capacity										1,500,000,000
Revolving Credit Facility [Member] | Line of Credit [Member]
Debt Instruments [Line Items]
Long-term Debt										0	0
Revolving Credit Facility [Abstract]
Revolving Credit Facility, Maximum Borrowing Capacity					$ 3,000,000,000.0					3,500,000,000.0						$ 4,000,000,000.0
Revolving Credit Facility, Remaining Borrowing Capacity										$ 3,500,000,000
Amount of revolving credit facility available to PT Freeport Indonesia														$ 500,000,000
Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] | Line of Credit [Member]
Revolving Credit Facility [Abstract]
Debt Instrument, Basis Spread on Variable Rate										2.50%
Revolving Credit Facility [Member] | Base Rate [Member] | Line of Credit [Member]
Revolving Credit Facility [Abstract]
Debt Instrument, Basis Spread on Variable Rate										1.50%
Eliminations
Debt Instruments [Line Items]
Long-term debt										$ (15,081,000,000)	$ (12,433,000,000)
Exchanges and Early Extinguishment of Debt [Abstract]
Net gain (loss) on early extinguishment of debt										0		$ 0
Eliminations | Cerro Verde | Shareholder Loan [Member]
Senior Notes Issued by FCX [Abstract]
Proceeds from Issuance of Long-term Debt										$ 345,000,000
Scenario, Forecast [Member]
Exchanges and Early Extinguishment of Debt [Abstract]
Debt Instrument, Leverage Ratio								3.75	4.25
Scenario, Forecast [Member] | Line of Credit [Member] | Cerro Verde | Line of Credit [Member]
Debt Instruments [Line Items]
Line of Credit Facility, Current Borrowing Capacity, Percentage		70.00%	85.00%
Scenario, Forecast [Member] | Debt Instrument, Redemption, Period Three [Member] | Line of Credit [Member] | Cerro Verde | Cerro Verde Credit Facility [Member] | Line of Credit [Member]
Debt Instruments [Line Items]
Line of Credit Facility, Current Borrowing Capacity, Percentage	35.00%

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- Definition

Amount of the revolving credit facility that is available to PT Freeport Indonesia.

+ References

No definition available.

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- Definition

Bank Term Loan [Abstract]

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- Definition

Cerro Verde [Abstract]

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- Definition

Debt Instrument, Additional Rate, Above Basis Spread on Variable Rate

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- Definition

Leverage ratio per debt agreement, calculated as net debt divided by EBITDA.

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- Definition

Number of installment payments under installment program.

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Exchanges and Early Extinguishment of Debt [Abstract]

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- Definition

Gross redemption value of debt extinguished.

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No definition available.

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- Definition

Amount of debt extinguishment related to purchase accounting fair value adjustments.

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No definition available.

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- Definition

Amount of borrowing capacity currently available under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility, expressed as a percentage of the maximum borrowing capacity.

+ References

No definition available.

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- Definition

Losses primarily associated with modification of credit facility

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No definition available.

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- Definition

Losses related to deferred debt issuance costs and senior note exchange offer

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