General Information (Unaudited)	6 Months Ended
Jun. 30, 2017
General Information [Abstract]
General Information	GENERAL INFORMATION The accompanying unaudited consolidated financial statements have been prepared in accordance with the instructions to Form 10-Q and do not include all information and disclosures required by generally accepted accounting principles (GAAP) in the United States (U.S.). Therefore, this information should be read in conjunction with Freeport-McMoRan Inc.’s (FCX) consolidated financial statements and notes contained in its annual report on Form 10-K for the year ended December 31, 2016. The information furnished herein reflects all adjustments that are, in the opinion of management, necessary for a fair statement of the results for the interim periods reported. With the exception of the accounting for discontinued operations, assets held for sale and the remeasurement of a pension plan, all such adjustments are, in the opinion of management, of a normal recurring nature. As a result of FCX’s sale of its interest in TF Holdings Limited (TFHL), FCX has reported TFHL as discontinued operations for all periods presented in the unaudited consolidated financial statements (refer to Note 2). Operating results for the six-month period ended June 30, 2017, are not necessarily indicative of the results that may be expected for the year ending December 31, 2017. Indonesia Mining. As a result of the first-quarter 2017 regulatory restrictions and uncertainties regarding long-term investment stability, PT Freeport Indonesia (PT-FI) took actions to adjust its cost structure, reduce its workforce and slow investments in its underground development projects and new smelter. These actions included workforce reductions through furlough and voluntary retirement programs. Following the furlough and voluntary retirement programs, a significant number of employees and contractors elected to participate in an illegal strike action beginning in May 2017, and were subsequently deemed to have voluntarily resigned under existing laws and regulations. As a result, PT-FI recorded charges to operating income for employee severance and related costs totaling $83 million for second-quarter 2017 and $104 million for the first six months of 2017. Additionally, because of the significant reduction in workforce, PT-FI was required to remeasure its pension assets and pension benefit obligation as of June 30, 2017. The discount rate and rate of compensation increase used for the June 30, 2017, remeasurement were 7.50 percent and 4.00 percent, respectively, compared to the December 31, 2016, discount rate of 8.25 percent and the rate of compensation increase of 8.00 percent. The expected long-term rate of return on the plan assets was unchanged (7.75 percent). The remeasurement and curtailment resulted in the projected benefit obligation declining by $145 million and plan assets declining by $21 million. In addition, PT-FI recognized a curtailment loss of $4 million in second-quarter 2017. As of June 30, 2017, the funded status of PT-FI’s pension plan was a net asset of $34 million (included in other assets in the consolidated balance sheet). Oil and Gas Properties. In the first half of 2016, FCX Oil & Gas LLC (FM O&G, a wholly owned subsidiary of FCX) determined the carrying values of certain of its unevaluated properties were impaired. For the first six months of 2016, FM O&G transferred $3.2 billion of costs (including $3.1 billion in first-quarter 2016) associated with unevaluated properties to the full cost pool, mostly reflecting impairment of the carrying values of unevaluated properties. Combined with the impact of the reduction in twelve-month historical prices and reserve revisions in 2016, net capitalized costs exceeded the related ceiling test limitation under full cost accounting rules, which resulted in the recognition of impairment charges of $291 million in second-quarter 2016 and $4.1 billion for the first six months of 2016. Refer to Note 1 of FCX’s annual report on Form 10-K for the year ended December 31, 2016, for further discussion.

GENERAL INFORMATION

The accompanying unaudited consolidated financial statements have been prepared in accordance with the instructions to Form 10-Q and do not include all information and disclosures required by generally accepted accounting principles (GAAP) in the United States (U.S.). Therefore, this information should be read in conjunction with Freeport-McMoRan Inc.’s (FCX) consolidated financial statements and notes contained in its annual report on Form 10-K for the year ended December 31, 2016. The information furnished herein reflects all adjustments that are, in the opinion of management, necessary for a fair statement of the results for the interim periods reported. With the exception of the accounting for discontinued operations, assets held for sale and the remeasurement of a pension plan, all such adjustments are, in the opinion of management, of a normal recurring nature. As a result of FCX’s sale of its interest in TF Holdings Limited (TFHL), FCX has reported TFHL as discontinued operations for all periods presented in the unaudited consolidated financial statements (refer to Note 2). Operating results for the six-month period ended June 30, 2017, are not necessarily indicative of the results that may be expected for the year ending December 31, 2017.

Indonesia Mining. As a result of the first-quarter 2017 regulatory restrictions and uncertainties regarding long-term investment stability, PT Freeport Indonesia (PT-FI) took actions to adjust its cost structure, reduce its workforce and slow investments in its underground development projects and new smelter. These actions included workforce reductions through furlough and voluntary retirement programs. Following the furlough and voluntary retirement programs, a significant number of employees and contractors elected to participate in an illegal strike action beginning in May 2017, and were subsequently deemed to have voluntarily resigned under existing laws and regulations. As a result, PT-FI recorded charges to operating income for employee severance and related costs totaling $83 million for second-quarter 2017 and $104 million for the first six months of 2017.

Additionally, because of the significant reduction in workforce, PT-FI was required to remeasure its pension assets and pension benefit obligation as of June 30, 2017. The discount rate and rate of compensation increase used for the June 30, 2017, remeasurement were 7.50 percent and 4.00 percent, respectively, compared to the December 31, 2016, discount rate of 8.25 percent and the rate of compensation increase of 8.00 percent. The expected long-term rate of return on the plan assets was unchanged (7.75 percent). The remeasurement and curtailment resulted in the projected benefit obligation declining by $145 million and plan assets declining by $21 million. In addition, PT-FI recognized a curtailment loss of $4 million in second-quarter 2017. As of June 30, 2017, the funded status of PT-FI’s pension plan was a net asset of $34 million (included in other assets in the consolidated balance sheet).

Oil and Gas Properties. In the first half of 2016, FCX Oil & Gas LLC (FM O&G, a wholly owned subsidiary of FCX) determined the carrying values of certain of its unevaluated properties were impaired. For the first six months of 2016, FM O&G transferred $3.2 billion of costs (including $3.1 billion in first-quarter 2016) associated with unevaluated properties to the full cost pool, mostly reflecting impairment of the carrying values of unevaluated properties. Combined with the impact of the reduction in twelve-month historical prices and reserve revisions in 2016, net capitalized costs exceeded the related ceiling test limitation under full cost accounting rules, which resulted in the recognition of impairment charges of $291 million in second-quarter 2016 and $4.1 billion for the first six months of 2016. Refer to Note 1 of FCX’s annual report on Form 10-K for the year ended December 31, 2016, for further discussion.