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Debt (Details) |  |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2021 USD ($) | Jun. 30, 2021 USD ($) | Dec. 31, 2020 USD ($) | Jun. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Jun. 30, 2016 USD ($) | Jun. 30, 2017 USD ($) years | Jun. 30, 2016 USD ($) | Dec. 31, 2016 USD ($)
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |  |
Long-term Debt and Capital Lease Obligations, Including Current Maturities |  |  |  | $ 15,354,000,000 | $ 15,354,000,000 |  |  | $ 15,354,000,000 |  | $ 16,027,000,000
Less current portion of long-term debt and short-term borrownings |  |  |  | (2,216,000,000) | (2,216,000,000) |  |  | (2,216,000,000) |  | (1,232,000,000)
Long-term debt |  |  |  | 13,138,000,000 | 13,138,000,000 |  |  | 13,138,000,000 |  | 14,795,000,000
Liabilities, Fair Value Adjustment |  |  |  |  |  |  |  | 163,000,000 |  | 179,000,000
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net |  |  |  | 98,000,000 | 98,000,000 |  |  | 98,000,000 |  | 100,000,000
Exchanges and Early Extinguishment of Debt [Abstract] |  |  |  |  |  |  |  |  |  |
Net loss (gain) on exchanges and early extinguishment of debt |  |  |  |  | (4,000,000) |  | $ 39,000,000 | (3,000,000) | $ 36,000,000 |
Interest Costs Incurred |  |  |  |  | 192,000,000 |  | 218,000,000 | 387,000,000 | 436,000,000 |
Other Debt, Including Capital Leases and Short Term Borrowings [Member] |  |  |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |  |
Long-term Debt and Capital Lease Obligations, Including Current Maturities |  |  |  | 7,000,000 | 7,000,000 |  |  | 7,000,000 |  | 5,000,000
Senior Notes Due 2017 2 Point 15 Percent [Member] | Senior Notes [Member] |  |  |  |  |  |  |  |  |  |
Senior Notes Issued by FCX [Abstract] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  | 2.15% |  |  |  |
Repayments of Debt |  |  |  |  |  | $ 500,000,000 |  |  |  |
Revolving Credit Facility [Member] | Senior Notes [Member] |  |  |  |  |  |  |  |  |  |
Exchanges and Early Extinguishment of Debt [Abstract] |  |  |  |  |  |  |  |  |  |
Losses primarily associated with modification of credit facility |  |  |  |  |  |  |  |  | 3,000,000 |
FCX [Member] | Senior Notes [Member] |  |  |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |  |
Long-term Debt, Gross |  |  |  | 13,238,000,000 | 13,238,000,000 |  |  | 13,238,000,000 |  | 13,745,000,000
Cerro Verde [Member] | Shareholder Loan [Member] |  |  |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |  |
Long-term Debt |  |  |  | 0 | 0 |  |  | 0 |  | 261,000,000
Freeport-McMoRan Oil & Gas | Senior Notes [Member] |  |  |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |  |
Long-term Debt, Gross |  |  |  | 266,000,000 | 266,000,000 |  |  | 266,000,000 |  | 267,000,000
Freeport McMoRan Corporation [Member] | Debentures [Member] |  |  |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |  |
Long-term Debt, Gross |  |  |  | 358,000,000 | 358,000,000 |  |  | 358,000,000 |  | 359,000,000
Line of Credit [Member] | Cerro Verde [Member] | Line of Credit [Member] |  |  |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |  |
Long-term Debt |  |  |  | 1,485,000,000 | 1,485,000,000 |  |  | 1,485,000,000 |  | $ 1,390,000,000
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 | $ 1,500,000,000.0 |  |  | $ 1,500,000,000.0 |  |
Debt Instrument, Number of Installment Payments | years |  |  |  |  |  |  |  | 4 |  |
Debt Instrument, Interest Rate, Effective Percentage |  |  |  | 3.12% | 3.12% |  |  | 3.12% |  |
Letter of Credit [Member] | Line of Credit [Member] |  |  |  |  |  |  |  |  |  |
Revolving Credit Facility [Abstract] |  |  |  |  |  |  |  |  |  |
Long-term Line of Credit |  |  |  | $ 37,000,000 | $ 37,000,000 |  |  | $ 37,000,000 |  |
Revolving Credit Facility, Remaining Borrowing Capacity |  |  |  | 1,500,000,000 | 1,500,000,000 |  |  | 1,500,000,000 |  |
Revolving Credit Facility [Member] | Line of Credit [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 |  |
Property, Plant and Equipment [Member] |  |  |  |  |  |  |  |  |  |
Exchanges and Early Extinguishment of Debt [Abstract] |  |  |  |  |  |  |  |  |  |
Interest Costs Capitalized |  |  |  |  | $ 30,000,000 |  | 22,000,000 | 58,000,000 | 42,000,000 |
Oil and Gas Operations Segment [Member] | Oil and Gas Properties [Member] |  |  |  |  |  |  |  |  |  |
Exchanges and Early Extinguishment of Debt [Abstract] |  |  |  |  |  |  |  |  |  |
Interest Costs Capitalized |  |  |  |  |  |  | $ 0 | $ 0 | $ 7,000,000 |
Debt Instrument, Redemption, Period Three [Member] | Scenario, Forecast [Member] | Line of Credit [Member] | Cerro Verde [Member] | Cerro Verde Credit Facility [Member] | Line of Credit [Member] |  |  |  |  |  |  |  |  |  |
Cerro Verde [Abstract] |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Periodic Payment | $ 525,000,000 | $ 225,000,000 | $ 225,000,000 |  |  |  |  |  |  |

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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://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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