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Debt and Equity (Details) $ / shares in Units, shares in Millions			3 Months Ended					6 Months Ended			12 Months Ended
	Jul. 27, 2020 USD ($)	Mar. 04, 2020 USD ($)	Dec. 31, 2021	Sep. 30, 2021	Sep. 30, 2020 USD ($)	Jun. 30, 2020 USD ($) $ / shares shares	Jun. 30, 2019 USD ($) $ / shares shares	Dec. 31, 2021	Jun. 30, 2020 USD ($) $ / shares shares	Jun. 30, 2019 USD ($) $ / shares shares	Dec. 31, 2022	Dec. 31, 2021	Apr. 03, 2020	Dec. 31, 2019 USD ($)
Debt Instrument [Line Items]
Dilutive Securities Excluded from Computation of EPS Amount \| shares						38	43		39	41
Total Debt [Abstract]
Current portion of debt						$ (90,000,000)			$ (90,000,000)
Long-term Debt, Current Maturities						90,000,000			90,000,000					$ 5,000,000
Long-term debt, less current portion						9,824,000,000			9,824,000,000
Debt														9,826,000,000
Long-term Debt and Lease Obligation, Including Current Maturities						9,914,000,000			9,914,000,000
Proceeds from repayment of debt		$ 1,290,000,000
Net gain (loss) on exchanges and early extinguishment of debt						(9,000,000)	$ 0		(41,000,000)	$ (6,000,000)
Interest costs						$ 159,000,000	$ 167,000,000		$ 330,000,000	$ 345,000,000
Dividends declared per share of common stock (in dollars per share) \| $ / shares						$ 0	$ 0.05		$ 0	$ 0.10
COVID Response, Dividend Suspended, Price Per Share \| $ / shares									$ 0.05
Long-term debt, less current portion						$ 9,824,000,000			$ 9,824,000,000					9,821,000,000
Senior Notes due 2028, 4.125% [Member] [Domain]
Total Debt [Abstract]
Debt		$ 700,000,000
Stated interest rate		4.125%
Senior Notes due 2030, 4.25% [Member] [Domain]
Total Debt [Abstract]
Debt		$ 600,000,000
Stated interest rate		4.25%
Senior Notes due 2021, 4.00%
Total Debt [Abstract]
Stated interest rate		4.00%											4.00%
3.55% Senior Notes Due 2022 [Member]
Total Debt [Abstract]
Stated interest rate		3.55%
Revolving Credit Facility [Member] \| Credit Agreement [Member]
Total Debt [Abstract]
Line of Credit Facility, Maximum Borrowing Capacity						3,500,000,000			3,500,000,000
Debt Instrument, Covenant, Minimum Liquidity Required									1,000,000,000
Property, Plant and Equipment [Member]
Total Debt [Abstract]
Interest costs capitalized						44,000,000	$ 35,000,000		88,000,000	$ 67,000,000
Line of Credit [Member] \| Cerro Verde [Member]
Total Debt [Abstract]
Debt														826,000,000
Long-term Debt and Lease Obligation, Including Current Maturities						827,000,000			827,000,000
Line of Credit [Member] \| Letter of Credit [Member]
Total Debt [Abstract]
Letter of credit						13,000,000			13,000,000
Revolving credit facility, availability						1,500,000,000			1,500,000,000
Line of Credit [Member] \| Revolving Credit Facility [Member]
Total Debt [Abstract]
Debt						0			0
Revolving credit facility, availability						3,500,000,000			3,500,000,000
Line of Credit [Member] \| Revolving Credit Facility [Member] \| Maturing 2024 [Member]
Total Debt [Abstract]
Revolving credit facility, availability						3,280,000,000			3,280,000,000
Line of Credit [Member] \| Revolving Credit Facility [Member] \| Maturing 2023 [Member]
Total Debt [Abstract]
Revolving credit facility, availability						220,000,000			220,000,000
Senior Notes [Member] \| FCX [Member]
Total Debt [Abstract]
Long-term Debt and Lease Obligation, Including Current Maturities						8,621,000,000			8,621,000,000					8,602,000,000
Debentures [Member] \| Freeport McMoRan Corporation [Member]
Total Debt [Abstract]
Long-term Debt and Lease Obligation, Including Current Maturities						357,000,000			357,000,000					357,000,000
Other Debt, Including Capital Leases and Short Term Borrowings [Member]
Total Debt [Abstract]
Debt														$ 41,000,000
Long-term Debt and Lease Obligation, Including Current Maturities						$ 109,000,000			$ 109,000,000
Subsequent event
Total Debt [Abstract]
Proceeds from Debt, Net of Issuance Costs	$ 1,490,000,000
Debt Instrument, Repurchase Amount	$ 1,300,000,000
Subsequent event \| 3.55% Senior Notes Due 2022 [Member]
Total Debt [Abstract]
Stated interest rate	3.55%
Subsequent event \| Senior Notes Due 2023, 3.875% [Member]
Total Debt [Abstract]
Stated interest rate	3.875%
Subsequent event \| Senior Notes due 2024 4 point 55 percent [Member]
Total Debt [Abstract]
Stated interest rate	4.55%
Subsequent event \| Senior Notes [Member] \| Notes Due 2028, 4.375% [Member]
Total Debt [Abstract]
Debt, principal	$ 650,000,000
Stated interest rate	4.375%
Subsequent event \| Senior Notes [Member] \| Notes Due 2030, 4.625% [Member]
Total Debt [Abstract]
Debt, principal	$ 850,000,000
Stated interest rate	4.625%
Forecast
Debt Instrument [Line Items]
Debt Instrument, Covenant Compliance, Leverage Ratio								5.25			3.75
Total Debt [Abstract]
Net gain (loss) on exchanges and early extinguishment of debt					$ (60,000,000)
Debt Instrument, Covenant, Interest Coverage Ratio, Minimum								2.00			2.25
Forecast \| Revolving Credit Facility [Member] \| Credit Agreement [Member]
Debt Instrument [Line Items]
Debt Instrument, Covenant Compliance, Leverage Ratio			3.75	5.25
Total Debt [Abstract]
Debt Instrument, Covenant, Interest Coverage Ratio, Minimum											2.75	2.00