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INCOME TAXES (Details) - USD ($)
$ in Millions
 3 Months Ended 7 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Dec. 31, 2013
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Nov. 03, 2014
Income before income taxes and equity in affiliated companies' net earnings [Abstract]                        
United States                 $ (14,589) $ (2,973) $ 1,119  
Foreign                 461 2,173 3,271  
Total                 (14,128) (800) 4,390  
Current income taxes:                        
Federal                 89 (269) (194)  
State                 2 (34) (9)  
Foreign                 (160) (1,066) (1,082)  
Total current                 (69) (1,369) (1,285)  
Deferred income taxes (benefits):                        
Federal                 3,403 616 (227)  
State                 154 214 35  
Foreign                 (163) (19) (226)  
Total deferred                 3,394 811 (418)  
Adjustments                 (1,374) [1] 0 199 [2]  
Benefit from (provision for) income taxes                 1,951 (225) [3],[4] (1,340) [5]  
Income Tax Expense (Benefit), Changes in Deferred Tax Liabilities and Deferred Tax Asset Valuation Allowances $ (1,400) $ (1,100) $ (305) $ (458) $ (22) $ (5) $ (57)   (3,300) (84) (190)  
Valuation allowance on deferred tax asset increase (decrease) during period                 1,749      
Deferred Other Tax Expense (Benefit)                     16  
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability, Environmental Matters                     (76)  
Income tax expense (benefit), reconciliation [Abstract]                        
U.S. federal statutory tax rate                 4,945 280 (1,536)  
Valuation allowance on minimum tax credits                 (2,955) [6] 0 190  
Foreign tax credit limitation                 (228) (136) (96)  
Percentage depletion                 186 263 [7] 223  
Withholding and other impacts on foreign earnings                 (193) (161) (306)  
Effect of foreign rates different than the U.S. federal statutory rate                 12 69 150  
Goodwill impairment                 0 (601) 0  
Goodwill transferred to full cost pool                 0 (77) 0  
State income taxes                 105 [6] 116 43  
Other items, net                 79 22 (8)  
Benefit from (provision for) income taxes                 $ 1,951 $ (225) [3],[4] $ (1,340) [5]  
Effective income tax rate, reconciliation [Abstract]                        
U.S. federal statutory tax rate               (35.00%) (35.00%) (35.00%) (35.00%)  
Valuation allowance on minimum tax credits                 21.00% (0.00%) 4.00%  
Foreign tax credit limitation                 2.00% 17.00% (2.00%)  
Percentage depletion                 (1.00%) (33.00%) 5.00%  
Withholding and other impacts on foreign earnings                 1.00% 20.00% (7.00%)  
Effect of foreign rates different than the U.S. federal statutory rate                 (0.00%) (9.00%) 3.00%  
Goodwill impairment                 (0.00%) 75.00% (0.00%)  
Goodwill transferred to full cost pool                 (0.00%) 10.00% (0.00%)  
State income taxes               (3.00%) (1.00%) (14.00%) 1.00%  
Other items, net                 (1.00%) (3.00%) (0.00%)  
Benefit from (provision for) income taxes                 (14.00%) 28.00% (31.00%)  
Tax charge related to change in U.S. federal income tax regulations                   $ (16)    
Total income taxes paid to all jurisdictions                 $ 893 1,500 $ 1,300  
Tax refunds received from all jurisdictions                 334 257 270  
Deferred tax assets:                        
Foreign tax credits 1,552       2,306       1,552 2,306    
Accrued expenses 1,166       1,029       1,166 1,029    
Oil and gas properties 1,422       0       1,422 0    
Minimum tax credits 569       737       569 737    
Net operating loss carryforwards 621       590       621 590    
Employee benefit plans 521       422       521 422    
Other 477       702       477 702    
Deferred tax assets 6,328       5,786       6,328 5,786    
Valuation allowances (4,183)       (2,434)       (4,183) (2,434)    
Net deferred tax assets 2,145       3,352       2,145 3,352    
Deferred tax liabilities:                        
Property, plant, equipment and development costs (4,839)       (4,581)       (4,839) (4,581)    
Oil and gas properties 0       (3,392)       0 (3,392)    
Undistributed earnings (855)       (807)       (855) (807)    
Other (55)       (185)       (55) (185)    
Total deferred tax liabilities (5,749)       (8,965)       (5,749) (8,965)    
Net deferred tax liabilities (3,604)       $ (5,613)       (3,604) (5,613)    
PT Freeport Indonesia [Member]                        
Deferred income taxes (benefits):                        
Adjustments [1]                 200      
Change in Deferred Tax Assets                 1,500      
Valuation allowance on deferred tax asset increase (decrease) during period                 (1,300)      
Freeport-McMoRan Oil & Gas [Member]                        
Income before income taxes and equity in affiliated companies' net earnings [Abstract]                        
Total                 (4,544) (1,200) (17)  
Deferred income taxes (benefits):                        
Benefit from (provision for) income taxes                 1,718 281 17  
Income Tax Expense (Benefit), Changes in Deferred Tax Liabilities and Deferred Tax Asset Valuation Allowances                 3,300      
Valuation allowance on deferred tax asset increase (decrease) during period                 (1,200)      
Income tax expense (benefit), reconciliation [Abstract]                        
Benefit from (provision for) income taxes                 1,718 281 17  
McMoRan Exploration Co [Member]                        
Deferred income taxes (benefits):                        
Deferred Other Tax Expense (Benefit)                     69  
Chile [Member]                        
Deferred income taxes (benefits):                        
Adjustments                   54    
Peru [Member]                        
Deferred income taxes (benefits):                        
Adjustments                   24    
Candelaria and Ojos del Salado Mining Complex [Member]                        
Effective income tax rate, reconciliation [Abstract]                        
Significant Acquisitions and Disposals, Gain (Loss) on Sale or Disposal, Tax Provision (Benefit)                       $ (221)
Foreign Tax Credits [Member]                        
Deferred tax assets:                        
Valuation allowances (1,600)               (1,600)      
Deferred Tax Assets [Member]                        
Deferred tax assets:                        
Valuation allowances (1,400)               (1,400)      
Minimum Tax Credit Carryforwards [Member]                        
Deferred tax assets:                        
Valuation allowances (569)               (569)      
Federal Operating Loss Carryforwards [Member]                        
Deferred income taxes (benefits):                        
Change in Deferred Tax Assets                 0 (333) [8] $ (164) [8]  
Deferred tax assets:                        
Valuation allowances $ (525)               (525)      
Discontinued Operations, Held-for-sale [Member] | Tenke Fungurume [Member]                        
Effective income tax rate, reconciliation [Abstract]                        
Total income taxes paid to all jurisdictions                 $ 187 $ 11    
[1] Adjustments include net provisions of $1.2 billion associated with an increase in the beginning of the year valuation allowance related to the impairment of U.S. oil and gas properties and $0.2 billion resulting from the termination of PT-FI's Delaware domestication reflecting a $1.5 billion reduction in deferred tax assets during the year, partially offset by a $1.3 billion reduction in the beginning of the year valuation allowance.
[2] As a result of the oil and gas acquisitions, FCX recognized a net benefit of $199 million, consisting of $190 million associated with net reductions in the beginning of the year valuation allowances, $69 million related to the release of the deferred tax liability on PXP's investment in MMR common stock and $16 million associated with the revaluation of state deferred tax liabilities, partially offset by income tax expense of $76 million associated with the write off of deferred tax assets related to environmental liabilities.
[3] Includes a net charge of $221 million related to the sale of the Candelaria and Ojos del Salado mines.
[4] Includes charges related to changes in Chilean and Peruvian tax rules of $54 million and $24 million, respectively.
[5] Includes a net tax benefit of $199 million as a result of the oil and gas acquisitions.
[6] As a result of the impairment to U.S. oil and gas properties, FCX recorded tax charges totaling $3.3 billion to establish valuation allowances against U.S. federal and state deferred tax assets for which a future benefit is not expected to be realized.
[7] Includes a net charge of $16 million in 2014 related to a change in U.S. federal income tax law.
[8] Benefit from the use of federal operating loss carryforwards acquired as part of the oil and gas acquisitions.