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Debt and Equity (Details) $ / shares in Units, shares in Millions				3 Months Ended				6 Months Ended	9 Months Ended
	Jan. 06, 2023	Jul. 27, 2020 USD ($)	Mar. 04, 2020 USD ($)	Mar. 31, 2022	Sep. 30, 2021	Sep. 30, 2020 USD ($) $ / shares shares	Sep. 30, 2019 USD ($) $ / shares shares	Dec. 31, 2021	Sep. 30, 2020 USD ($) $ / shares shares	Sep. 30, 2019 USD ($) $ / shares shares	Apr. 03, 2020	Dec. 31, 2019 USD ($)
Debt Instrument [Line Items]
Dilutive Securities Excluded from Computation of EPS Amount \| shares						28	43		35	42
Total Debt [Abstract]
Current portion of debt						$ (47,000,000)			$ (47,000,000)
Long-term Debt, Current Maturities						47,000,000			47,000,000			$ 5,000,000
Long-term debt, less current portion						9,983,000,000			9,983,000,000
Debt												9,826,000,000
Long-term Debt and Lease Obligation, Including Current Maturities						10,030,000,000			10,030,000,000
Proceeds from Debt, Net of Issuance Costs		$ 1,485,000,000
Debt Instrument, Repurchase Amount		$ 1,400,000,000
Proceeds from repayment of debt			$ 1,285,000,000
Net loss on early extinguishment of debt						59,000,000	$ 21,000,000		100,000,000	$ 27,000,000
Interest costs						$ 160,000,000	$ 163,000,000		$ 490,000,000	$ 508,000,000
Dividends declared per share of common stock (in dollars per share) \| $ / shares						$ 0	$ 0.05		$ 0	$ 0.15
COVID Response, Dividend Suspended, Price Per Share \| $ / shares									$ 0.05
Long-term debt, less current portion						$ 9,983,000,000			$ 9,983,000,000			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%	3.55%
Senior Notes Due 2023, 3.875% [Member]
Total Debt [Abstract]
Stated interest rate		3.875%
Senior Notes due 2024 4 point 55 percent [Member]
Total Debt [Abstract]
Stated interest rate		4.55%
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						40,000,000			128,000,000	$ 107,000,000
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] \| Notes Due 2028, 4.375% [Member]
Total Debt [Abstract]
Debt, principal		$ 650,000,000
Stated interest rate		4.375%
Senior Notes [Member] \| Notes Due 2030, 4.625% [Member]
Total Debt [Abstract]
Debt, principal		$ 850,000,000
Stated interest rate		4.625%
Senior Notes [Member] \| FCX [Member]
Total Debt [Abstract]
Long-term Debt and Lease Obligation, Including Current Maturities						8,780,000,000			8,780,000,000			8,602,000,000
Debentures [Member] \| Freeport McMoRan Corporation [Member]
Total Debt [Abstract]
Long-term Debt and Lease Obligation, Including Current Maturities						356,000,000			356,000,000			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						$ 67,000,000			$ 67,000,000
Forecast
Debt Instrument [Line Items]
Debt Instrument, Covenant Compliance, Leverage Ratio	3.75							5.25
Total Debt [Abstract]
Debt Instrument, Covenant, Interest Coverage Ratio, Minimum	2.25							2.00
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