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DEBT - Components of Debt (Details) - USD ($) |  | 9 Months Ended |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
May 02, 2019 | Sep. 30, 2014 | Dec. 31, 2020 | Jul. 31, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Aug. 15, 2019 | Aug. 01, 2019
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |
Long-term Debt |  |  | $ 9,711,000,000 |  |  |  | $ 9,826,000,000 |  |
Long-term Debt and Capital Lease Obligations, Repayments of Principal in Next Twelve Months |  |  | (34,000,000) |  |  |  | (5,000,000) |  |
Long-term debt |  |  | $ 9,677,000,000 |  |  |  | $ 9,821,000,000 |  |
Term of Debt Agreement | 5 years |  |  |  |  |  |  |  |
4.00% Senior Notes Due 2021 [Member] |  |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  | 4.00% |  |  | 4.00%
3.55% Senior Notes Due 2022 [Member] |  |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  | 3.55% |  |  | 3.55%
6.875% Senior Notes due 2023 [Member] |  |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  |  |  | 6.875%
senior notes 4.55 [Member] |  |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  |  | 4.55% |
Senior Notes due 2027, 5% [Member] |  |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  | 4.375% |  |  |  |  | 5.00%
Long-term Debt |  |  |  | $ 650,000,000 |  |  |  |  |
Senior Notes due 2029, 5.25% [Member] |  |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  | 4.625% |  |  |  |  | 5.25%
Long-term Debt |  |  |  | $ 850,000,000 |  |  |  |  |
Senior Notes Due 2028, 4.125% [Member] |  |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  | 4.125% |  |  |
Senior Notes Due 2030, 4.25% |  |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  | 4.25% |  |  |
Senior Notes [Member] | 2.15% Senior Notes due 2017 [Member] |  |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 2.15% |  |  |  |  |  |
Senior Notes [Member] | 2.30% Senior Notes Due 2017 |  |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 2.30% |  |  |  |  |  |
Senior Notes [Member] | 2.375% Senior Notes due March 2018 [Member] |  |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 2.375% |  |  |  |  |  |
Senior Notes [Member] | 6.125% Senior Notes due 2019 [Member] |  |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 6.125% |  |  |  | 6.125% |  |
Senior Notes [Member] | 3.100% Senior Notes due March 2020 |  |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 3.10% |  |  |  |  |  |
Senior Notes [Member] | 6.5% Senior Notes due 2020 [Member] |  |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 6.50% |  |  |  | 6.50% |  |
Senior Notes [Member] | 6.625% Senior Notes due 2021 [Member] |  |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 6.625% |  |  |  | 6.625% |  |
Senior Notes [Member] | 4.00% Senior Notes Due 2021 [Member] |  |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 4.00% |  |  |  |  |  |
Long-term Debt |  |  | $ 0 |  |  |  | $ 194,000,000 |  |
Senior Notes [Member] | 6.75% Senior Notes due 2022 [Member] |  |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 6.75% |  |  |  | 6.75% |  |
Senior Notes [Member] | 3.55% Senior Notes Due 2022 [Member] |  |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 3.55% |  |  |  |  |  |
Long-term Debt |  |  | $ 523,000,000 |  |  |  | $ 1,876,000,000 |  |
Senior Notes [Member] | 6.875% Senior Notes due 2023 [Member] |  |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 6.875% |  |  |  | 6.875% |  |
Senior Notes [Member] | 3.875% Senior Notes due March 2023 [Member] |  |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 3.875% |  |  |  |  |  |
Long-term Debt |  |  | $ 994,000,000 |  |  |  | $ 1,917,000,000 |  |
Senior Notes [Member] | senior notes 4.55 [Member] |  |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 4.55% |  |  |  |  |  |
Long-term Debt |  |  | $ 728,000,000 |  |  |  | 846,000,000 |  |
Senior Notes [Member] | Senior Notes due 2027, 5% [Member] |  |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 5.00% |  |  |  |  |  |
Long-term Debt |  |  | $ 593,000,000 |  |  |  | 592,000,000 |  |
Senior Notes [Member] | Senior Notes due 2029, 5.25% [Member] |  |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 5.25% |  |  |  |  |  |
Long-term Debt |  |  | $ 593,000,000 |  |  |  | 592,000,000 |  |
Senior Notes [Member] | Senior Notes due 2034 5 point 4 percent [Member] |  |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 5.40% |  |  |  |  |  |
Long-term Debt |  |  | $ 742,000,000 |  |  |  | 741,000,000 |  |
Senior Notes [Member] | 5.450% Senior Notes due March 2043 [Member] |  |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 5.45% |  |  |  |  |  |
Long-term Debt |  |  | $ 1,845,000,000 |  |  |  | 1,844,000,000 |  |
Senior Notes [Member] | Senior Notes Due 2028, 4.125% [Member] |  |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 4.125% |  |  |  |  |  |
Long-term Debt |  |  | $ 691,000,000 |  |  |  | 0 |  |
Senior Notes [Member] | Senior Notes Due 2028, 4.375% |  |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 4.375% |  |  |  |  |  |
Long-term Debt |  |  | $ 642,000,000 |  |  |  | 0 |  |
Senior Notes [Member] | Senior Notes Due 2030, 4.25% |  |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 4.25% |  |  |  |  |  |
Long-term Debt |  |  | $ 592,000,000 |  |  |  | 0 |  |
Senior Notes [Member] | Senior Notes Due 2030, 4.625% |  |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 4.625% |  |  |  |  |  |
Long-term Debt |  |  | $ 840,000,000 |  |  |  | 0 |  |
Other Debt [Member] |  |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |
Long-term Debt |  |  | 49,000,000 |  |  |  | 41,000,000 |  |
Revolving Credit Facility [Member] | Line of Credit [Member] |  |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |
Long-term Debt |  |  | 0 |  |  |  | 0 |  |
Line of Credit Facility, Remaining Borrowing Capacity |  |  | 3,500,000,000 |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  | $ 3,500,000,000 |  |  |  |
Letter of Credit [Member] | Line of Credit [Member] |  |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |
Long-term Line of Credit |  |  | 10,000,000 |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  | 1,500,000,000 |  |  |  |  |  |
Cerro Verde | Shareholder Loan [Member] |  |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |
Long-term Debt |  |  | 0 |  |  |  | 0 |  |
Cerro Verde | Line of Credit [Member] |  |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |
Long-term Debt |  |  | $ 523,000,000 |  |  |  | 826,000,000 |  |
Cerro Verde | Line of Credit [Member] | Line of Credit [Member] |  |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |
Term of Debt Agreement |  | 5 years |  |  |  |  |  |  |
Freeport-McMoRan Oil & Gas | Senior Notes [Member] | 6.125% Senior Notes due 2019 [Member] |  |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 6.125% |  |  |  |  |  |
Freeport-McMoRan Oil & Gas | Senior Notes [Member] | 6.5% Senior Notes due 2020 [Member] |  |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 6.50% |  |  |  |  |  |
Freeport-McMoRan Oil & Gas | Senior Notes [Member] | 6.625% Senior Notes due 2021 [Member] |  |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 6.625% |  |  |  |  |  |
Freeport-McMoRan Oil & Gas | Senior Notes [Member] | 6.75% Senior Notes due 2022 [Member] |  |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 6.75% |  |  |  |  |  |
Freeport-McMoRan Oil & Gas | Senior Notes [Member] | 6.875% Senior Notes due 2023 [Member] |  |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 6.875% |  |  |  |  |  |
Freeport McMoRan Corporation [Member] | Senior Notes [Member] | Senior Notes Due 2031 [Member] |  |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 9.50% |  |  |  |  |  |
Long-term Debt |  |  | $ 124,000,000 |  |  |  | 125,000,000 |  |
Freeport McMoRan Corporation [Member] | Senior Notes [Member] | Senior Notes Due 2034 [Member] |  |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 6.125% |  |  |  |  |  |
Long-term Debt |  |  | $ 117,000,000 |  |  |  | 117,000,000 |  |
Freeport McMoRan Corporation [Member] | Debentures [Member] | Debentures Due 2027 [Member] |  |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 7.125% |  |  |  |  |  |
Long-term Debt |  |  | $ 115,000,000 |  |  |  | $ 115,000,000 |  |

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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910 + Details
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