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DISPOSITIONS AND ACQUISITIONS (FCX Consolidated Balance Sheet) (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Dec. 21, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Other current assets $ 655 $ 422  
Property, plant, equipment and mine development costs, net 29,584 28,010  
Noncontrolling interests (8,150) (8,094)  
Capital in excess of par value $ 25,830 $ 26,013  
PT-FI | Rio Tinto Share In Joint Venture      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Cash     $ 458
Other current assets     23
Liabilities other than taxes     (77)
Deferred income taxes, net     (788)
Noncontrolling interests     (4,762)
Capital in excess of par value     531
PT-FI | Rio Tinto Share In Joint Venture | Mineral reserves      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Property, plant, equipment and mine development costs, net     3,056
PT-FI | Rio Tinto Share In Joint Venture | Mine development, infrastructure and other      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Property, plant, equipment and mine development costs, net     $ 1,559