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Debt (Details) |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2021 USD ($) | Jun. 30, 2021 USD ($) | Dec. 31, 2020 USD ($) | Sep. 30, 2017 USD ($) | Dec. 31, 2016 USD ($) | Jun. 30, 2017 USD ($) | Sep. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Sep. 30, 2016 USD ($) | Sep. 30, 2017 USD ($) years | Sep. 30, 2016 USD ($)
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Long-term Debt and Capital Lease Obligations, Including Current Maturities |  |  |  | $ 14,782,000,000 | $ 16,027,000,000 |  | $ 14,782,000,000 |  |  | $ 14,782,000,000 |
Less current portion of long-term debt and short-term borrownings |  |  |  | (2,215,000,000) | (1,232,000,000) |  | (2,215,000,000) |  |  | (2,215,000,000) |
Long-term debt |  |  |  | 12,567,000,000 | 14,795,000,000 |  | 12,567,000,000 |  |  | 12,567,000,000 |
Liabilities, Fair Value Adjustment |  |  |  | 131,000,000 | 179,000,000 |  |  |  |  |  |
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net |  |  |  | 92,000,000 | 100,000,000 |  | 92,000,000 |  |  | 92,000,000 |
Exchanges and Early Extinguishment of Debt [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net loss (gain) on exchanges and early extinguishment of debt |  |  |  |  |  |  | 11,000,000 |  | $ 15,000,000 | 8,000,000 | $ 51,000,000
Interest Costs Incurred |  |  |  |  |  |  | 196,000,000 |  | 211,000,000 | 583,000,000 | 647,000,000
Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |
Exchanges and Early Extinguishment of Debt [Abstract] |  |  |  |  |  |  |  |  |  |  |
Losses primarily associated with modification of credit facility |  |  |  |  |  |  |  |  |  |  | (3,000,000)
Property, Plant and Equipment [Member] |  |  |  |  |  |  |  |  |  |  |
Exchanges and Early Extinguishment of Debt [Abstract] |  |  |  |  |  |  |  |  |  |  |
Interest Costs Capitalized |  |  |  |  |  |  | 33,000,000 |  | 24,000,000 | 91,000,000 | 66,000,000
Oil and Gas Operations Segment [Member] | Oil and Gas Properties [Member] |  |  |  |  |  |  |  |  |  |  |
Exchanges and Early Extinguishment of Debt [Abstract] |  |  |  |  |  |  |  |  |  |  |
Interest Costs Capitalized |  |  |  |  |  |  | 0 |  | $ 0 | 0 | 7,000,000
Line of Credit [Member] | Line of Credit [Member] | Cerro Verde [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Long-term Debt |  |  |  | $ 1,486,000,000 | 1,390,000,000 |  | $ 1,486,000,000 |  |  | $ 1,486,000,000 |
Cerro Verde [Abstract] |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Increase (Decrease), Net |  |  |  |  |  | $ 225,000,000 |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  |  | $ 1,500,000,000.0 |  |  |  |  |
Debt Instrument, Number of Installment Payments | years |  |  |  |  |  |  |  |  |  | 4 |
Debt Instrument, Interest Rate, Effective Percentage |  |  |  | 3.14% |  |  | 3.14% |  |  | 3.14% |
Line of Credit [Member] | Letter of Credit [Member] |  |  |  |  |  |  |  |  |  |  |
Revolving Credit Facility [Abstract] |  |  |  |  |  |  |  |  |  |  |
Long-term Line of Credit |  |  |  | $ 36,000,000 |  |  | $ 36,000,000 |  |  | $ 36,000,000 |
Revolving Credit Facility, Remaining Borrowing Capacity |  |  |  | 1,500,000,000 |  |  | 1,500,000,000 |  |  | 1,500,000,000 |
Line of Credit [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Long-term Debt |  |  |  | 0 |  |  | 0 |  |  | 0 |
Revolving Credit Facility [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revolving Credit Facility, Remaining Borrowing Capacity |  |  |  | 3,500,000,000 |  |  | 3,500,000,000 |  |  | 3,500,000,000 |
Line of Credit [Member] | Debt Instrument, Redemption, Period Three [Member] | Scenario, Forecast [Member] | Line of Credit [Member] | Cerro Verde [Member] | Cerro Verde Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |
Cerro Verde [Abstract] |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Periodic Payment | $ 525,000,000 | $ 225,000,000 | $ 225,000,000 |  |  |  |  |  |  |  |
Shareholder Loan [Member] | Cerro Verde [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Long-term Debt |  |  |  | 0 | 261,000,000 |  | 0 |  |  | 0 |
Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  | 543,000,000 |  |  | 543,000,000 |  |  | 543,000,000 |
Exchanges and Early Extinguishment of Debt [Abstract] |  |  |  |  |  |  |  |  |  |  |
Debt Issuance Costs, Net |  |  |  | 23,000,000 |  |  | 23,000,000 |  |  | 23,000,000 |
Extinguishment of Debt, Amount |  |  |  |  |  |  | 566,000,000 |  |  |  |
Extinguishment Of Debt, Redemption Value |  |  |  |  |  |  | 555,000,000 |  |  |  |
Net loss (gain) on exchanges and early extinguishment of debt |  |  |  |  |  |  | 11,000,000 |  |  |  | $ 54,000,000
Losses primarily associated with modification of credit facility |  |  |  |  |  |  | (3,000,000) |  |  |  |
Senior Notes [Member] | 6.625% Senior Notes due 2021 [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  | 228,000,000 |  |  | 228,000,000 |  |  | 228,000,000 |
Exchanges and Early Extinguishment of Debt [Abstract] |  |  |  |  |  |  |  |  |  |  |
Debt Issuance Costs, Net |  |  |  | 12,000,000 |  |  | 12,000,000 |  |  | 12,000,000 |
Extinguishment of Debt, Amount |  |  |  |  |  |  | 240 |  |  |  |
Extinguishment Of Debt, Redemption Value |  |  |  |  |  |  | 234,000,000 |  |  |  |
Net loss (gain) on exchanges and early extinguishment of debt |  |  |  |  |  |  | 6,000,000 |  |  |  |
Senior Notes [Member] | 6.125% Senior Notes due 2019 [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  | 179,000,000 |  |  | 179,000,000 |  |  | 179,000,000 |
Exchanges and Early Extinguishment of Debt [Abstract] |  |  |  |  |  |  |  |  |  |  |
Debt Issuance Costs, Net |  |  |  | 5,000,000 |  |  | 5,000,000 |  |  | 5,000,000 |
Extinguishment of Debt, Amount |  |  |  |  |  |  | 184 |  |  |  |
Extinguishment Of Debt, Redemption Value |  |  |  |  |  |  | 182,000,000 |  |  |  |
Net loss (gain) on exchanges and early extinguishment of debt |  |  |  |  |  |  | 2,000,000 |  |  |  |
Senior Notes [Member] | 2.15% Senior Notes Due 2017 [Member] |  |  |  |  |  |  |  |  |  |  |
Senior Notes Issued by FCX [Abstract] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  |  | 2.15% |  |  |
Repayments of Debt |  |  |  |  |  |  |  | $ 500,000,000 |  |  |
Senior Notes [Member] | FCX [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Gross |  |  |  | 12,811,000,000 | 13,745,000,000 |  | 12,811,000,000 |  |  | 12,811,000,000 |
Senior Notes [Member] | Freeport-McMoRan Oil & Gas |  |  |  |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Gross |  |  |  | 122,000,000 | 267,000,000 |  | 122,000,000 |  |  | 122,000,000 |
Senior Notes [Member] | Freeport-McMoRan Oil & Gas | 6.625% Senior Notes due 2021 [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  | 33,000,000 |  |  | 33,000,000 |  |  | 33,000,000 |
Exchanges and Early Extinguishment of Debt [Abstract] |  |  |  |  |  |  |  |  |  |  |
Debt Issuance Costs, Net |  |  |  | 2,000,000 |  |  | 2,000,000 |  |  | 2,000,000 |
Extinguishment of Debt, Amount |  |  |  |  |  |  | 35 |  |  |  |
Extinguishment Of Debt, Redemption Value |  |  |  |  |  |  | 34,000,000 |  |  |  |
Net loss (gain) on exchanges and early extinguishment of debt |  |  |  |  |  |  | 1,000,000 |  |  |  |
Senior Notes [Member] | Freeport-McMoRan Oil & Gas | 6.125% Senior Notes due 2019 [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  | 58,000,000 |  |  | 58,000,000 |  |  | 58,000,000 |
Exchanges and Early Extinguishment of Debt [Abstract] |  |  |  |  |  |  |  |  |  |  |
Debt Issuance Costs, Net |  |  |  | 2,000,000 |  |  | 2,000,000 |  |  | 2,000,000 |
Extinguishment of Debt, Amount |  |  |  |  |  |  | 60 |  |  |  |
Extinguishment Of Debt, Redemption Value |  |  |  |  |  |  | 59,000,000 |  |  |  |
Net loss (gain) on exchanges and early extinguishment of debt |  |  |  |  |  |  | 1,000,000 |  |  |  |
Senior Notes [Member] | Freeport-McMoRan Oil & Gas | 6.75% Senior Notes due 2022 [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  | 45,000,000 |  |  | 45,000,000 |  |  | 45,000,000 |
Exchanges and Early Extinguishment of Debt [Abstract] |  |  |  |  |  |  |  |  |  |  |
Debt Issuance Costs, Net |  |  |  | 2,000,000 |  |  | 2,000,000 |  |  | 2,000,000 |
Extinguishment of Debt, Amount |  |  |  |  |  |  | 47 |  |  |  |
Extinguishment Of Debt, Redemption Value |  |  |  |  |  |  | 46,000,000 |  |  |  |
Net loss (gain) on exchanges and early extinguishment of debt |  |  |  |  |  |  | 1,000,000 |  |  |  |
Debentures [Member] | Freeport McMoRan Corporation [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Gross |  |  |  | 358,000,000 | 359,000,000 |  | 358,000,000 |  |  | 358,000,000 |
Other Debt, Including Capital Leases and Short Term Borrowings [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Long-term Debt and Capital Lease Obligations, Including Current Maturities |  |  |  | $ 5,000,000 | $ 5,000,000 |  | $ 5,000,000 |  |  | $ 5,000,000 |

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- Definition Amount of short-term debt and current maturity of long-term debt and capital lease obligations due within one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19,20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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://www.xbrl.org/2003/role/presentationRef -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=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -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 + Details
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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399 + Details
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- Definition Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Amount of unamortized debt discount (premium) and debt issuance costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28555-108399 + Details
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- Definition Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28555-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=49170532&loc=d3e12317-112629 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=49170532&loc=d3e12355-112629 + Details
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- Definition Amount of interest capitalized during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6450988&loc=d3e26243-108391 + Details
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- Definition Total interest costs incurred during the period and either capitalized or charged against earnings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450988&loc=d3e26243-108391 + Details
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- Definition Amount of addition (reduction) to the amount at which a liability could be incurred (settled) in a current transaction between willing parties. + References No definition available. + Details
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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://www.xbrl.org/2003/role/presentationRef -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://www.xbrl.org/2003/role/presentationRef -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=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -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 + Details
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