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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 |
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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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- Definition Amount of the revolving credit facility that is available to PT Freeport Indonesia. + References No definition available. + Details
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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. + Details
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- Definition Date when the acquirer obtains control of the acquiree, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=34752592&loc=d3e845-128460 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Acquisition Date -URI http://asc.fasb.org/extlink&oid=6919109 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=34752592&loc=d3e848-128460 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6850294&loc=d3e12317-112629 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6401765&loc=d3e13305-112630 + Details
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- Definition Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6850294&loc=d3e12317-112629 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6850294&loc=d3e12355-112629 + Details
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- Definition Amount of addition (reduction) to the amount at which a liability could be incurred (settled) in a current transaction between willing parties. + References No definition available. + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition 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). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585 + Details
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