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Debt and Equity Transactions (Unaudited) (Details) (USD $)	3 Months Ended		6 Months Ended			6 Months Ended		3 Months Ended	1 Months Ended	3 Months Ended		6 Months Ended				3 Months Ended			3 Months Ended		3 Months Ended		3 Months Ended		3 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Mar. 07, 2013 Senior Notes [Member]	Jun. 30, 2014 Credit Facility [Domain] Revolving Credit Facility [Member]	Mar. 31, 2014 Credit Facility [Domain] Revolving Credit Facility [Member]	Mar. 31, 2013 Bridge Loan [Member]	May 31, 2013 Plains Exploration & Production Company [Member]	Jun. 30, 2014 Plains Exploration & Production Company [Member] Senior Notes [Member] 6.625% Senior Notes due 2021 [Member]	Mar. 31, 2014 Plains Exploration & Production Company [Member] Senior Notes [Member] 6.625% Senior Notes due 2021 [Member]	Jun. 30, 2014 Cerro Verde [Member] Credit Facility [Domain]	Jun. 30, 2014 Cerro Verde [Member] Tranche 1 [Member] Credit Facility [Domain]	Jun. 30, 2014 Cerro Verde [Member] Tranche 2 [Member] Credit Facility [Domain]	Jun. 30, 2014 Cerro Verde [Member] Tranche 3 [Member] Credit Facility [Domain]	Sep. 30, 2014 Subsequent Event [Member]	Sep. 30, 2014 Subsequent Event [Member] Plains Exploration & Production Company [Member] Senior Notes [Member]	Jul. 23, 2014 Subsequent Event [Member] Plains Exploration & Production Company [Member] Senior Notes [Member]	Sep. 30, 2014 Subsequent Event [Member] Plains Exploration & Production Company [Member] Senior Notes [Member] 6.125% Senior Notes due 2019 [Member]	Jul. 23, 2014 Subsequent Event [Member] Plains Exploration & Production Company [Member] Senior Notes [Member] 6.125% Senior Notes due 2019 [Member]	Sep. 30, 2014 Subsequent Event [Member] Plains Exploration & Production Company [Member] Senior Notes [Member] 6.5% Senior Notes due 2020 [Member]	Jul. 23, 2014 Subsequent Event [Member] Plains Exploration & Production Company [Member] Senior Notes [Member] 6.5% Senior Notes due 2020 [Member]	Sep. 30, 2014 Subsequent Event [Member] Plains Exploration & Production Company [Member] Senior Notes [Member] 6.75% Senior Notes due 2022 [Member]	Jul. 23, 2014 Subsequent Event [Member] Plains Exploration & Production Company [Member] Senior Notes [Member] 6.75% Senior Notes due 2022 [Member]	Sep. 30, 2014 Subsequent Event [Member] Plains Exploration & Production Company [Member] Senior Notes [Member] 6.875% Senior Notes due 2023 [Member]	Jul. 23, 2014 Subsequent Event [Member] Plains Exploration & Production Company [Member] Senior Notes [Member] 6.875% Senior Notes due 2023 [Member]
Extinguishment of Debt [Line Items]
Extinguishment of Debt, Amount										$ 210,000,000							$ 1,700,000,000		$ 263,000,000		$ 525,000,000		$ 350,000,000		$ 525,000,000
Debt Instrument, Repurchase Date																	Jul. 23, 2014
Debt Instrument, Interest Rate, Stated Percentage											6.625%									6.125%		6.50%		6.75%		6.875%
Long-term Debt, Gross																		1,800,000,000
Liabilities, Fair Value Adjustment																	167,000,000
Proceeds from Unsecured Lines of Credit																950,000,000
Gains (Losses) on Extinguishment of Debt	5,000,000	0	5,000,000	(45,000,000)				(45,000,000)		6,000,000							58,000,000
Extinguishment of Debt, Gain (Loss), Net of Tax								39,000,000
Line of Credit Facility, Maximum Borrowing Capacity						4,000,000,000	3,000,000,000					1,800,000,000
Amount of revolving credit facility available to subsidiary							500,000,000
Line of Credit Facility, Expiration Date						May 31, 2019						Mar. 10, 2019	Sep. 30, 2017	Mar. 31, 2018	Sep. 30, 2018
Line of Credit Facility, Amount Outstanding						0						0
Letters of Credit Outstanding, Amount						46,000,000						0
Line of Credit Facility, Remaining Borrowing Capacity						4,000,000,000
Line Of Credit Facility Remaining Borrowing Capacity Available For Letters Of Credit						1,500,000,000						500,000,000
Business Acquisition, Effective Date of Acquisition									May 31, 2013
Term of Debt Agreement												5 years
Debt Instrument, Description of Variable Rate Basis												LIBOR
Debt Instrument, Basis Spread on Variable Rate												1.90%
Term When Funds Are Available to be Drawn on Debt Agreement												2 years
Line of Credit Facility, Current Borrowing Capacity, Percentage													85.00%	70.00%	35.00%
Debt Instrument, Face Amount					$ 6,500,000,000			$ 9,500,000,000

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

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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.

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Amount of borrowing capacity currently available under the credit facility for letters of credit.

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The term over which a debt agreement is valid.

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Date when the acquirer obtains control of the acquiree, in CCYY-MM-DD format.

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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Amount of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal operating cycle, if longer.

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The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR.

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Face (par) amount of debt instrument at time of issuance.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Gross amount of debt extinguished.

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The difference between the reacquisition price and the net carrying amount of the extinguished debt recognized currently as a component of income in the period of extinguishment, net of tax.

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Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

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Amount of addition (reduction) to the amount at which a liability could be incurred (settled) in a current transaction between willing parties.

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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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The cash inflow from a contractual arrangement with the lender, including letter of credit, standby letter of credit and revolving credit arrangements, under which borrowings can be made up to a specific amount at any point in time with either short term or long term maturity that is uncollateralized (where debt is not backed by the pledge of collateral).

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