Debt and Equity Transactions (Unaudited)	3 Months Ended
Mar. 31, 2014
Debt and Equity Transactions [Abstract]
Debt and Equity Transactions	DEBT AND EQUITY TRANSACTIONS In March 2014, FCX announced that FM O&G would redeem on April 30, 2014, a total of $210 million of the aggregate principal amount of the outstanding 6.625% Senior Notes due 2021. In accordance with the terms of the senior notes, the redemption was funded with cash contributions to FM O&G by FCX in exchange for additional equity, which is eliminated in the consolidated financial statements. FCX funded its contributions with its revolving credit facility. Holders of these senior notes received the principal amount together with the redemption premium and accrued and unpaid interest to the redemption date. As a result of the redemption, FCX recorded a gain on early extinguishment of debt of $6 million in the second quarter of 2014. In the first quarter of 2014, FCX borrowed $115 million on its short-term lines of credit. FCX has uncommitted lines of credit with certain financial institutions for up to $450 million. These unsecured lines of credit allow FCX to borrow at a spread over the London Interbank Offered Rate (LIBOR) or the respective financial institution's cost of funds with terms and pricing that are more favorable than FCX's revolving credit facility. The effective interest rate on the lines of credit was 1.19 percent at March 31, 2014. In March 2014, Sociedad Minera Cerro Verde S.A.A. (Cerro Verde, FCX's mining subsidiary in Peru) entered into a five-year, $1.8 billion senior unsecured credit facility that is nonrecourse to FCX and the other shareholders of Cerro Verde. The credit facility allows for term loan borrowings up to the full amount of the facility, less any amounts issued and outstanding under a $500 million letter of credit sublimit. Interest on amounts drawn under the term loan is based on LIBOR plus a spread (currently 1.90 percent) based on Cerro Verde’s total net debt to earnings before interest, taxes, depreciation and amortization (EBITDA) ratio as defined in the agreement. Amounts may be drawn or letters of credit may be issued over a two-year period to fund a portion of Cerro Verde’s expansion project and for Cerro Verde's general corporate purposes. The credit facility amortizes in three installments in amounts necessary for the aggregate borrowings and outstanding letters of credit not to exceed 85 percent of the $1.8 billion commitment on September 30, 2017, 70 percent on March 31, 2018, and 35 percent on September 30, 2018, with the remaining balance due on the maturity date of March 10, 2019. At March 31, 2014, there were no borrowings and no letters of credit issued under Cerro Verde’s credit facility. In February 2013, FCX entered into an agreement for a $4.0 billion unsecured term loan (the Term Loan) in connection with the second-quarter 2013 acquisitions of PXP and MMR. Upon closing the PXP acquisition, FCX borrowed $4.0 billion under the Term Loan, and Freeport-McMoRan Oil & Gas LLC (FM O&G LLC, a wholly owned subsidiary of FM O&G and the successor entity of PXP) joined the Term Loan as a borrower. Interest on the Term Loan (currently LIBOR plus 1.50 percent or the alternate base rate (ABR) plus 0.50 percent) is determined by reference to FCX's credit rating. The effective interest rate on the Term Loan was 1.65 percent at March 31, 2014. In February 2013, FCX and PT Freeport Indonesia (PT-FI) entered into a new senior unsecured $3.0 billion revolving credit facility, which replaced FCX's existing revolving credit facility (scheduled to mature on March 30, 2016) upon completion of the acquisition of PXP on May 31, 2013. In connection with the PXP acquisition, FM O&G LLC joined the revolving credit facility as a borrower. The new revolving credit facility is available until May 31, 2018, with $500 million available to PT-FI. At March 31, 2014, there were no borrowings and $46 million of letters of credit issued under the revolving credit facility, resulting in availability of approximately $3.0 billion, of which $1.5 billion could be used for additional letters of credit. In March 2013, in connection with the financing of FCX's second-quarter 2013 acquisitions of PXP and MMR, FCX issued $6.5 billion of unsecured senior notes in four tranches. FCX sold $1.5 billion of 2.375% Senior Notes due March 2018, $1.0 billion of 3.100% Senior Notes due March 2020, $2.0 billion of 3.875% Senior Notes due March 2023 and $2.0 billion of 5.450% Senior Notes due March 2043 for total net proceeds of $6.4 billion. FCX recorded a loss on early extinguishment of debt of $45 million ($40 million to net income attributable to FCX common stockholders) in first-quarter 2013 for financing costs incurred for the terminated $9.5 billion acquisition bridge loan facility, which was entered into in December 2012 to provide interim financing for the second-quarter 2013 acquisitions of PXP and MMR. Consolidated interest expense (excluding capitalized interest) totaled $224 million in first-quarter 2014 and $75 million in first-quarter 2013. Capitalized interest totaled $63 million in first-quarter 2014 ($40 million included in property, plant, equipment and mining development costs, net, and $23 million included in oil and gas properties not subject to amortization) and $18 million in first-quarter 2013 (included in property, plant, equipment and mining development costs, net). On March 26, 2014, FCX's Board of Directors declared a quarterly dividend of $0.3125 per share, which was paid on May 1, 2014, to common shareholders of record at the close of business on April 15, 2014.

DEBT AND EQUITY TRANSACTIONS

In March 2014, FCX announced that FM O&G would redeem on April 30, 2014, a total of $210 million of the aggregate principal amount of the outstanding 6.625% Senior Notes due 2021. In accordance with the terms of the senior notes, the redemption was funded with cash contributions to FM O&G by FCX in exchange for additional equity, which is eliminated in the consolidated financial statements. FCX funded its contributions with its revolving credit facility. Holders of these senior notes received the principal amount together with the redemption premium and accrued and unpaid interest to the redemption date. As a result of the redemption, FCX recorded a gain on early extinguishment of debt of $6 million in the second quarter of 2014.

In the first quarter of 2014, FCX borrowed $115 million on its short-term lines of credit. FCX has uncommitted lines of credit with certain financial institutions for up to $450 million. These unsecured lines of credit allow FCX to borrow at a spread over the London Interbank Offered Rate (LIBOR) or the respective financial institution's cost of funds with terms and pricing that are more favorable than FCX's revolving credit facility. The effective interest rate on the lines of credit was 1.19 percent at March 31, 2014.

In March 2014, Sociedad Minera Cerro Verde S.A.A. (Cerro Verde, FCX's mining subsidiary in Peru) entered into a five-year, $1.8 billion senior unsecured credit facility that is nonrecourse to FCX and the other shareholders of Cerro Verde. The credit facility allows for term loan borrowings up to the full amount of the facility, less any amounts issued and outstanding under a $500 million letter of credit sublimit. Interest on amounts drawn under the term loan is based on LIBOR plus a spread (currently 1.90 percent) based on Cerro Verde’s total net debt to earnings before interest, taxes, depreciation and amortization (EBITDA) ratio as defined in the agreement. Amounts may be drawn or letters of credit may be issued over a two-year period to fund a portion of Cerro Verde’s expansion project and for Cerro Verde's general corporate purposes. The credit facility amortizes in three installments in amounts necessary for the aggregate borrowings and outstanding letters of credit not to exceed 85 percent of the $1.8 billion commitment on September 30, 2017, 70 percent on March 31, 2018, and 35 percent on September 30, 2018, with the remaining balance due on the maturity date of March 10, 2019. At March 31, 2014, there were no borrowings and no letters of credit issued under Cerro Verde’s credit facility.

In February 2013, FCX entered into an agreement for a $4.0 billion unsecured term loan (the Term Loan) in connection with the second-quarter 2013 acquisitions of PXP and MMR. Upon closing the PXP acquisition, FCX borrowed $4.0 billion under the Term Loan, and Freeport-McMoRan Oil & Gas LLC (FM O&G LLC, a wholly owned subsidiary of FM O&G and the successor entity of PXP) joined the Term Loan as a borrower. Interest on the Term Loan (currently LIBOR plus 1.50 percent or the alternate base rate (ABR) plus 0.50 percent) is determined by reference to FCX's credit rating. The effective interest rate on the Term Loan was 1.65 percent at March 31, 2014.

In February 2013, FCX and PT Freeport Indonesia (PT-FI) entered into a new senior unsecured $3.0 billion revolving credit facility, which replaced FCX's existing revolving credit facility (scheduled to mature on March 30, 2016) upon completion of the acquisition of PXP on May 31, 2013. In connection with the PXP acquisition, FM O&G LLC joined the revolving credit facility as a borrower. The new revolving credit facility is available until May 31, 2018, with $500 million available to PT-FI. At March 31, 2014, there were no borrowings and $46 million of letters of credit issued under the revolving credit facility, resulting in availability of approximately $3.0 billion, of which $1.5 billion could be used for additional letters of credit.

In March 2013, in connection with the financing of FCX's second-quarter 2013 acquisitions of PXP and MMR, FCX issued $6.5 billion of unsecured senior notes in four tranches. FCX sold $1.5 billion of 2.375% Senior Notes due March 2018, $1.0 billion of 3.100% Senior Notes due March 2020, $2.0 billion of 3.875% Senior Notes due March 2023 and $2.0 billion of 5.450% Senior Notes due March 2043 for total net proceeds of $6.4 billion.

FCX recorded a loss on early extinguishment of debt of $45 million ($40 million to net income attributable to FCX common stockholders) in first-quarter 2013 for financing costs incurred for the terminated $9.5 billion acquisition bridge loan facility, which was entered into in December 2012 to provide interim financing for the second-quarter 2013 acquisitions of PXP and MMR.

Consolidated interest expense (excluding capitalized interest) totaled $224 million in first-quarter 2014 and $75 million in first-quarter 2013. Capitalized interest totaled $63 million in first-quarter 2014 ($40 million included in property, plant, equipment and mining development costs, net, and $23 million included in oil and gas properties not subject to amortization) and $18 million in first-quarter 2013 (included in property, plant, equipment and mining development costs, net).

On March 26, 2014, FCX's Board of Directors declared a quarterly dividend of $0.3125 per share, which was paid on May 1, 2014, to common shareholders of record at the close of business on April 15, 2014.