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Fair Value Measurement (Fair Value Measurement Inputs) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Sep. 30, 2021	Dec. 31, 2020	Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring Basis, Financial Statement Captions [Line Items]
Other Assets, Current	$ 361			$ 341
Other assets	1,537			1,560
Proceeds from Sale of Other Assets, contingent consideration	5	$ 66
Derivative Liability, Fair Value, Gross Liability	68			21
Investment securities (current and long-term):
Marketable Securities	0
Derivatives:
Derivative Asset	118			183
Derivatives: [Abstract]
Derivative Liability	60			20
Fair Value Measured at Net Asset Value Per Share [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis, Financial Statement Captions [Line Items]
Discontinued Operation, Contingent Receivable	0			0
Investment securities (current and long-term):
Investments, Fair Value Disclosure	29			29
Trust Assets Fair Value Disclosure	63			65
Derivatives:
Derivative Asset	0			0
Derivatives: [Abstract]
Derivative Liability	0
Long-term debt, including current portion	0			0
Level 1
Fair Value, Assets and Liabilities Measured on Recurring Basis, Financial Statement Captions [Line Items]
Discontinued Operation, Contingent Receivable	0			0
Investment securities (current and long-term):
Investments, Fair Value Disclosure	6			7
Trust Assets Fair Value Disclosure	12			5
Derivatives:
Derivative Asset	16			13
Derivatives: [Abstract]
Derivative Liability	0
Long-term debt, including current portion	0			0
Level 2
Fair Value, Assets and Liabilities Measured on Recurring Basis, Financial Statement Captions [Line Items]
Discontinued Operation, Contingent Receivable	0			0
Investment securities (current and long-term):
Investments, Fair Value Disclosure	0			0
Trust Assets Fair Value Disclosure	131			143
Derivatives:
Derivative Asset	110			171
Derivatives: [Abstract]
Derivative Liability	68
Long-term debt, including current portion	10,891			10,994
Level 3
Fair Value, Assets and Liabilities Measured on Recurring Basis, Financial Statement Captions [Line Items]
Discontinued Operation, Contingent Receivable	88			88
Investment securities (current and long-term):
Investments, Fair Value Disclosure	0			0
Trust Assets Fair Value Disclosure	0			0
Derivatives:
Derivative Asset	0			0
Derivatives: [Abstract]
Derivative Liability	0
Long-term debt, including current portion	0			0
Estimate of Fair Value Measurement [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis, Financial Statement Captions [Line Items]
Discontinued Operation, Contingent Receivable	88			88
Investment securities (current and long-term):
Investments, Fair Value Disclosure	35			36
Trust Assets Fair Value Disclosure	206			213
Derivatives:
Derivative Asset	126			184
Derivatives: [Abstract]
Derivative Liability	68
Long-term debt, including current portion	10,891			10,994
Carrying Amount, Fair Value Disclosure [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis, Financial Statement Captions [Line Items]
Discontinued Operation, Contingent Receivable	104			108
Investment securities (current and long-term):
Investments, Fair Value Disclosure	35			36
Trust Assets Fair Value Disclosure	206			213
Derivatives:
Derivative Asset	126			184
Derivatives: [Abstract]
Derivative Liability	68
Long-term debt, including current portion	9,809			9,711
Embedded Derivative Financial Instruments [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis, Financial Statement Captions [Line Items]
Derivative Liability, Fair Value, Gross Liability	67			21
Derivatives:
Derivative Asset	98			168
Derivatives: [Abstract]
Derivative Liability	60			20
Embedded Derivative Financial Instruments [Member] | Fair Value Measured at Net Asset Value Per Share [Member]
Derivatives:
Derivative Asset	0			0
Derivatives: [Abstract]
Derivative Liability	0			0
Embedded Derivative Financial Instruments [Member] | Level 1
Derivatives:
Derivative Asset	0			0
Derivatives: [Abstract]
Derivative Liability	0			0
Embedded Derivative Financial Instruments [Member] | Level 2
Derivatives:
Derivative Asset	105			169
Derivatives: [Abstract]
Derivative Liability	67			21
Embedded Derivative Financial Instruments [Member] | Level 3
Derivatives:
Derivative Asset	0			0
Derivatives: [Abstract]
Derivative Liability	0			0
Embedded Derivative Financial Instruments [Member] | Estimate of Fair Value Measurement [Member]
Derivatives:
Derivative Asset	105			169
Derivatives: [Abstract]
Derivative Liability	67			21
Embedded Derivative Financial Instruments [Member] | Carrying Amount, Fair Value Disclosure [Member]
Derivatives:
Derivative Asset	105			169
Derivatives: [Abstract]
Derivative Liability	67			21
Forward Contracts [Member] | Level 1
Derivatives:
Derivative Asset	1
Forward Contracts [Member] | Level 2
Derivatives:
Derivative Asset	2
Forward Contracts [Member] | Level 3
Derivatives:
Derivative Asset	0
Forward Contracts [Member] | Estimate of Fair Value Measurement [Member]
Derivatives:
Derivative Asset	3
Forward Contracts [Member] | Carrying Amount, Fair Value Disclosure [Member]
Derivatives:
Derivative Asset	3
Commodity Contract [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis, Financial Statement Captions [Line Items]
Derivative Liability, Fair Value, Gross Liability	1			0
Derivatives:
Derivative Asset	20			15
Derivatives: [Abstract]
Derivative Liability	0			0
Commodity Contract [Member] | Fair Value Measured at Net Asset Value Per Share [Member]
Derivatives:
Derivative Asset	0			0
Derivatives: [Abstract]
Derivative Liability	0
Commodity Contract [Member] | Level 1
Derivatives:
Derivative Asset				13
Derivatives: [Abstract]
Derivative Liability	0
Commodity Contract [Member] | Level 2
Derivatives:
Derivative Asset				2
Derivatives: [Abstract]
Derivative Liability	1
Commodity Contract [Member] | Level 3
Derivatives:
Derivative Asset				0
Derivatives: [Abstract]
Derivative Liability	0
Commodity Contract [Member] | Estimate of Fair Value Measurement [Member]
Derivatives:
Derivative Asset				15
Derivatives: [Abstract]
Derivative Liability	1
Commodity Contract [Member] | Carrying Amount, Fair Value Disclosure [Member]
Derivatives:
Derivative Asset				15
Derivatives: [Abstract]
Derivative Liability	1
Future [Member] | Level 1
Derivatives:
Derivative Asset	15
Future [Member] | Level 2
Derivatives:
Derivative Asset	3
Future [Member] | Level 3
Derivatives:
Derivative Asset	0
Future [Member] | Estimate of Fair Value Measurement [Member]
Derivatives:
Derivative Asset	18
Future [Member] | Carrying Amount, Fair Value Disclosure [Member]
Derivatives:
Derivative Asset	18
U.S. core fixed income fund [Member] | Fair Value Measured at Net Asset Value Per Share [Member]
Investment securities (current and long-term):
Marketable Securities	29			29
Trust Assets Fair Value Disclosure	63			65
U.S. core fixed income fund [Member] | Level 1
Investment securities (current and long-term):
Marketable Securities	0			0
Trust Assets Fair Value Disclosure	0			0
U.S. core fixed income fund [Member] | Level 2
Investment securities (current and long-term):
Marketable Securities	0			0
Trust Assets Fair Value Disclosure	0			0
U.S. core fixed income fund [Member] | Level 3
Investment securities (current and long-term):
Marketable Securities	0			0
Trust Assets Fair Value Disclosure	0			0
U.S. core fixed income fund [Member] | Estimate of Fair Value Measurement [Member]
Investment securities (current and long-term):
Marketable Securities	29			29
Trust Assets Fair Value Disclosure	63			65
U.S. core fixed income fund [Member] | Carrying Amount, Fair Value Disclosure [Member]
Investment securities (current and long-term):
Marketable Securities	29			29
Trust Assets Fair Value Disclosure	63			65
Equity securities | Fair Value Measured at Net Asset Value Per Share [Member]
Investment securities (current and long-term):
Marketable Securities				0
Equity securities | Level 1
Investment securities (current and long-term):
Marketable Securities	6			7
Equity securities | Level 2
Investment securities (current and long-term):
Marketable Securities	0			0
Equity securities | Level 3
Investment securities (current and long-term):
Marketable Securities	0			0
Equity securities | Estimate of Fair Value Measurement [Member]
Investment securities (current and long-term):
Marketable Securities	6			7
Equity securities | Carrying Amount, Fair Value Disclosure [Member]
Investment securities (current and long-term):
Marketable Securities	6			7
Government bonds | Fair Value Measured at Net Asset Value Per Share [Member]
Investment securities (current and long-term):
Trust Assets Fair Value Disclosure	0			0
Government bonds | Level 1
Investment securities (current and long-term):
Trust Assets Fair Value Disclosure	0			0
Government bonds | Level 2
Investment securities (current and long-term):
Trust Assets Fair Value Disclosure	46			49
Government bonds | Level 3
Investment securities (current and long-term):
Trust Assets Fair Value Disclosure	0			0
Government bonds | Estimate of Fair Value Measurement [Member]
Investment securities (current and long-term):
Trust Assets Fair Value Disclosure	46			49
Government bonds | Carrying Amount, Fair Value Disclosure [Member]
Investment securities (current and long-term):
Trust Assets Fair Value Disclosure	46			49
Corporate bonds [Member] | Fair Value Measured at Net Asset Value Per Share [Member]
Investment securities (current and long-term):
Trust Assets Fair Value Disclosure	0			0
Corporate bonds [Member] | Level 1
Investment securities (current and long-term):
Trust Assets Fair Value Disclosure	0			0
Corporate bonds [Member] | Level 2
Investment securities (current and long-term):
Trust Assets Fair Value Disclosure	40			43
Corporate bonds [Member] | Level 3
Investment securities (current and long-term):
Trust Assets Fair Value Disclosure	0			0
Corporate bonds [Member] | Estimate of Fair Value Measurement [Member]
Investment securities (current and long-term):
Trust Assets Fair Value Disclosure	40			43
Corporate bonds [Member] | Carrying Amount, Fair Value Disclosure [Member]
Investment securities (current and long-term):
Trust Assets Fair Value Disclosure	40			43
Government mortgage-backed securities [Member] | Fair Value Measured at Net Asset Value Per Share [Member]
Investment securities (current and long-term):
Trust Assets Fair Value Disclosure	0			0
Government mortgage-backed securities [Member] | Level 1
Investment securities (current and long-term):
Trust Assets Fair Value Disclosure	0			0
Government mortgage-backed securities [Member] | Level 2
Investment securities (current and long-term):
Trust Assets Fair Value Disclosure	28			30
Government mortgage-backed securities [Member] | Level 3
Investment securities (current and long-term):
Trust Assets Fair Value Disclosure	0			0
Government mortgage-backed securities [Member] | Estimate of Fair Value Measurement [Member]
Investment securities (current and long-term):
Trust Assets Fair Value Disclosure	28			30
Government mortgage-backed securities [Member] | Carrying Amount, Fair Value Disclosure [Member]
Investment securities (current and long-term):
Trust Assets Fair Value Disclosure	28			30
Asset-backed securities [Member] | Fair Value Measured at Net Asset Value Per Share [Member]
Investment securities (current and long-term):
Trust Assets Fair Value Disclosure	0			0
Asset-backed securities [Member] | Level 1
Investment securities (current and long-term):
Trust Assets Fair Value Disclosure	0			0
Asset-backed securities [Member] | Level 2
Investment securities (current and long-term):
Trust Assets Fair Value Disclosure	12			16
Asset-backed securities [Member] | Level 3
Investment securities (current and long-term):
Trust Assets Fair Value Disclosure	0			0
Asset-backed securities [Member] | Estimate of Fair Value Measurement [Member]
Investment securities (current and long-term):
Trust Assets Fair Value Disclosure	12			16
Asset-backed securities [Member] | Carrying Amount, Fair Value Disclosure [Member]
Investment securities (current and long-term):
Trust Assets Fair Value Disclosure	12			16
Money market funds [Member] | Fair Value Measured at Net Asset Value Per Share [Member]
Investment securities (current and long-term):
Trust Assets Fair Value Disclosure	0			0
Money market funds [Member] | Level 1
Investment securities (current and long-term):
Trust Assets Fair Value Disclosure	12			5
Money market funds [Member] | Level 2
Investment securities (current and long-term):
Trust Assets Fair Value Disclosure	0			0
Money market funds [Member] | Level 3
Investment securities (current and long-term):
Trust Assets Fair Value Disclosure	0			0
Money market funds [Member] | Estimate of Fair Value Measurement [Member]
Investment securities (current and long-term):
Trust Assets Fair Value Disclosure	12			5
Money market funds [Member] | Carrying Amount, Fair Value Disclosure [Member]
Investment securities (current and long-term):
Trust Assets Fair Value Disclosure	12			5
Collateralized Mortgage Backed Securities [Member] | Fair Value Measured at Net Asset Value Per Share [Member]
Investment securities (current and long-term):
Trust Assets Fair Value Disclosure	0			0
Collateralized Mortgage Backed Securities [Member] | Level 1
Investment securities (current and long-term):
Trust Assets Fair Value Disclosure	0			0
Collateralized Mortgage Backed Securities [Member] | Level 2
Investment securities (current and long-term):
Trust Assets Fair Value Disclosure	4			4
Collateralized Mortgage Backed Securities [Member] | Level 3
Investment securities (current and long-term):
Trust Assets Fair Value Disclosure	0			0
Collateralized Mortgage Backed Securities [Member] | Estimate of Fair Value Measurement [Member]
Investment securities (current and long-term):
Trust Assets Fair Value Disclosure	4			4
Collateralized Mortgage Backed Securities [Member] | Carrying Amount, Fair Value Disclosure [Member]
Investment securities (current and long-term):
Trust Assets Fair Value Disclosure	4			4
Municipal bonds [Member] | Fair Value Measured at Net Asset Value Per Share [Member]
Investment securities (current and long-term):
Trust Assets Fair Value Disclosure	0			0
Municipal bonds [Member] | Level 1
Investment securities (current and long-term):
Trust Assets Fair Value Disclosure	0			0
Municipal bonds [Member] | Level 2
Investment securities (current and long-term):
Trust Assets Fair Value Disclosure	1			1
Municipal bonds [Member] | Level 3
Investment securities (current and long-term):
Trust Assets Fair Value Disclosure	0			0
Municipal bonds [Member] | Estimate of Fair Value Measurement [Member]
Investment securities (current and long-term):
Trust Assets Fair Value Disclosure	1			1
Municipal bonds [Member] | Carrying Amount, Fair Value Disclosure [Member]
Investment securities (current and long-term):
Trust Assets Fair Value Disclosure	1			1
Bank Time Deposits [Member] | Carrying Amount, Fair Value Disclosure [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis, Financial Statement Captions [Line Items]
Other Assets, Current	106			97
Other assets	148
Not Designated as Hedging Instrument [Member] | Embedded Derivative Financial Instruments [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis, Financial Statement Captions [Line Items]
Derivative Liability, Fair Value, Gross Liability	67			21
Freeport-McMoRan Oil & Gas | Onshore California [Member]
Derivatives:
Discontinued Operation, Contingent Receivable, Per Year	50
Freeport-McMoRan Oil & Gas | Deepwater Gulf of Mexico Interests [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis, Financial Statement Captions [Line Items]
Other Assets, Current	18			12
Other assets	86			$ 96
Discontinued Operation, Contingent Receivable					$ 150
Forecast | Freeport-McMoRan Oil & Gas | Onshore California [Member]
Derivatives:
Discontinued Operation, Contingent Receivable, Per Year			$ 50
Fair Value, Recurring [Member] | Forward Contracts [Member] | Estimate of Fair Value Measurement [Member]
Derivatives:
Derivative Asset	$ 0

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Discontinued Operation, Contingent Receivable

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption, parenthetical disclosure or within the fair value disclosures required in the footnote disclosures to the financial statements. This item represents the amount of trust assets (current and long-term) existing as of the balance sheet date.

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Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

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Fair value, before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement.

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Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

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The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

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Amount of investment in marketable security.

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Amount of cash inflow from the sale of other assets recognized in investing activities.

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