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Face (par) amount of debt instrument at time of issuance.

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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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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.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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Debt (Details) $ / shares in Units, $ in Millions			1 Months Ended	3 Months Ended			6 Months Ended		12 Months Ended
Debt (Details) $ / shares in Units, $ in Millions	Jun. 27, 2018 $ / shares	Apr. 04, 2018 USD ($)	Apr. 30, 2018 USD ($)	Jun. 30, 2018 USD ($) $ / shares	Mar. 31, 2018 USD ($)	Jun. 30, 2017 USD ($) $ / shares	Jun. 30, 2018 USD ($) $ / shares	Jun. 30, 2017 USD ($) $ / shares	Dec. 31, 2017 USD ($)
Debt Instruments [Line Items]
Long-term Debt and Capital Lease Obligations, Including Current Maturities				$ 11,127			$ 11,127		$ 13,117
Less current portion of long-term debt and short-term borrownings				(4)			(4)		(1,414)
Long-term Debt and Capital Lease Obligations, Repayments of Principal in Next Twelve Months									1,414
Long-term debt				11,123			11,123		11,703
Liabilities, Fair Value Adjustment							63		97
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net				76			76		85
Revolving Credit Facility [Abstract]
Debt Instrument, Term			5 years
Senior Notes Issued by FCX [Abstract]
Repayments of Debt							2,297	$ 1,250
Exchanges and Early Extinguishment of Debt [Abstract]
Net loss (gain) on exchanges and early extinguishment of debt				9		$ (4)	8	(3)
Interest Costs Incurred				$ 165		$ 192	$ 341	$ 387
Dividends declared per share of common stock \| $ / shares	$ 0.05			$ 0.05		$ 0	$ 0.10	$ 0
Long-term Debt and Capital Lease Obligations									11,703
Property, Plant and Equipment [Member]
Exchanges and Early Extinguishment of Debt [Abstract]
Interest Costs Capitalized				$ 23		$ 30	$ 48	$ 58
Line of Credit [Member] \| Line of Credit [Member] \| Cerro Verde [Member]
Debt Instruments [Line Items]
Long-term Debt				1,171			1,171		1,269
Line of Credit [Member] \| Letter of Credit [Member]
Revolving Credit Facility [Abstract]
Long-term Line of Credit				13			13
Revolving Credit Facility, Remaining Borrowing Capacity			$ 1,500	1,500			1,500
Line of Credit [Member] \| Revolving Credit Facility [Member]
Debt Instruments [Line Items]
Long-term Debt				0			0
Revolving Credit Facility [Abstract]
Revolving Credit Facility, Remaining Borrowing Capacity				3,500			3,500
Line of Credit Facility, Maximum Borrowing Capacity			3,500
Exchanges and Early Extinguishment of Debt [Abstract]
Amount of revolving credit facility available to subsidiary			$ 500
Senior Notes [Member]
Debt Instruments [Line Items]
Extinguishment of Debt, Amount				480
Debt Instrument, Face Amount				454			454
Debt Issuance Costs, Net				26			26
Exchanges and Early Extinguishment of Debt [Abstract]
Extinguishment Of Debt, Redemption Value				470
Net loss (gain) on exchanges and early extinguishment of debt				10
Gains (losses) primarily associated with modification of credit facility						$ 4
Repayments of Lines of Credit					$ 100
Senior Notes [Member] \| 2.375% Senior Notes due March 2018 [Member]
Senior Notes Issued by FCX [Abstract]
Repayments of Debt					$ 1,400
Senior Notes [Member] \| 6.75% Senior Notes due 2022 [Member]
Debt Instruments [Line Items]
Extinguishment of Debt, Amount				426
Debt Instrument, Face Amount				404			404
Debt Issuance Costs, Net				22			22
Exchanges and Early Extinguishment of Debt [Abstract]
Extinguishment Of Debt, Redemption Value				418
Net loss (gain) on exchanges and early extinguishment of debt				8
Senior Notes [Member] \| FCX [Member]
Debt Instruments [Line Items]
Long-term Debt, Gross				9,594			9,594		11,429
Senior Notes [Member] \| Freeport-McMoRan Oil & Gas
Debt Instruments [Line Items]
Long-term Debt, Gross				0			0		54
Exchanges and Early Extinguishment of Debt [Abstract]
Extinguishment Of Debt, Redemption Value		$ 454
Senior Notes [Member] \| Freeport-McMoRan Oil & Gas \| 6.875% Senior Notes due 2023 [Member]
Debt Instruments [Line Items]
Extinguishment of Debt, Amount				54
Debt Instrument, Face Amount				50			50
Debt Issuance Costs, Net				4			4
Exchanges and Early Extinguishment of Debt [Abstract]
Extinguishment Of Debt, Redemption Value				52
Net loss (gain) on exchanges and early extinguishment of debt				2
Debentures [Member] \| Freeport McMoRan Corporation [Member]
Debt Instruments [Line Items]
Long-term Debt, Gross				358			358		358
Other Debt, Including Capital Leases and Short Term Borrowings [Member]
Debt Instruments [Line Items]
Long-term Debt and Capital Lease Obligations, Including Current Maturities				$ 4			$ 4		$ 7
Maximum [Member]
Exchanges and Early Extinguishment of Debt [Abstract]
Debt Instrument, Covenant Compliance, Leverage Ratio			3.75
Minimum [Member]
Exchanges and Early Extinguishment of Debt [Abstract]
DebtInstrumentCovenantComplianceCoverageRatio			2.25