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CONTINGENCIES (Environmental and Reclamation Programs) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
New Mexico Environmental And Reclamation Programs |  |
Site Contingency [Line Items] |  |
Accrued reclamation and closure costs | $ 454 |
Arizona Environmental And Reclamation Programs |  |
Site Contingency [Line Items] |  |
Accrued reclamation and closure costs | 345 |
Colorado Environmental And Reclamation Programs |  |
Site Contingency [Line Items] |  |
Accrued reclamation and closure costs | 130 |
El Abra |  |
Site Contingency [Line Items] |  |
Accrued reclamation and closure costs | 62 |
Cerro Verde |  |
Site Contingency [Line Items] |  |
Accrued reclamation and closure costs | 125 |
Pt Freeport Indonesia Environmental And Reclamation Programs [Member] |  |
Site Contingency [Line Items] |  |
Accrued reclamation and closure costs | 936 |
Mine Closure |  |
Site Contingency [Line Items] |  |
Funding restricted time deposit during period for closure and reclamation guarantees | 92 |
Mine Reclamation |  |
Site Contingency [Line Items] |  |
Funding restricted time deposit during period for closure and reclamation guarantees | $ 8 |
MOEF Framework |  |
Site Contingency [Line Items] |  |
Permit Fees |  | $ 32

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- Definition Net cash inflow (outflow) of time deposits. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 230 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6477933&loc=d3e60009-112784 + Details
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- Definition Amount of a reclamation and mine closing liability that is associated with a legal obligation for the closure and reclamation of a mine including the removal of buildings, equipment, machinery and other physical remnants of mining, closure of tailings impoundments, leach pads and other mine features, and contouring, covering and revegetation of waste rock piles and other disturbed areas. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 5.Y.Q2) -URI http://asc.fasb.org/extlink&oid=27011672&loc=d3e149879-122751 + Details
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