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SUPPLEMENTARY OIL AND GAS INFORMATION (UNAUDITED) (Schedule of Costs Incurred) (Details) - USD ($)
$ in Millions
 7 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Jun. 30, 2014
Property acquisition costs:          
Proved properties $ 12,205 [1],[2] $ 0 $ 463    
Unproved properties 11,259 [2],[3] 61 1,460    
Exploration costs 502 [2] 1,250 1,482    
Development costs 854 [2] 1,442 1,270    
Total 24,820 [2] 2,753 4,675    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Oil and Gas Properties, Subject to Depletion 12,200     $ 12,200 $ 12,198
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Oil and Gas Properties, Not Subject to Depletion $ 11,100     11,100 $ 11,112
Liabilities assumed in the acquisitions of PXP and MMR [4]   0 0 1,028  
Oil and Gas Operations Segment [Member]          
Property acquisition costs:          
Asset Retirement Obligation, Period Increase (Decrease)   (80) (27) 1,100  
Liabilities assumed in the acquisitions of PXP and MMR [4]       1,000  
General and Administrative Costs Capitalized   124 143 67  
Interest Costs Capitalized   $ 58 $ 88 $ 69  
[1] Includes $12.2 billion from the acquisitions of PXP and MMR.
[2] Includes the results of FM O&G beginning June 1, 2013.
[3] Includes $11.1 billion from the acquisitions of PXP and MMR.
[4] The fair value of AROs assumed in the acquisitions of PXP and MMR ($741 million and $287 million, respectively) were estimated based on projected cash flows, an estimated long-term annual inflation rate of 2.5 percent and discount rates based on FCX's estimated credit-adjusted, risk-free interest rates ranging from 1.3 percent to 6.3 percent.