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