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Financial Instruments (Unsettled Derivatives) (Details) oz in Thousands, lb in Millions, $ in Millions	1 Months Ended	3 Months Ended		9 Months Ended
	Apr. 30, 2020 lb	Sep. 30, 2021 USD ($) $ / lb $ / oz $ / lb	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($) oz lb $ / lb $ / oz $ / lb	Sep. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset		$ 37		$ 37		$ 184
Derivative Liability, Fair Value, Gross Liability		152		152		21
Derivative Asset, Fair Value, Gross Liability		4		4		1
Derivative Liability, Fair Value, Gross Asset		4		4		1
Derivative Asset		33		33		183
Derivative Liability		148		148		20
Trade accounts receivable [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset		3		3		168
Derivative Liability		101		101		0
Accounts Payable and Accrued Liabilities
Derivatives, Fair Value [Line Items]
Derivative Asset		26		26		0
Derivative Liability		45		45		20
Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset		4		4		15
Derivative Liability		0		0		0
Other Liabilities
Derivatives, Fair Value [Line Items]
Derivative Asset		0		0		0
Derivative Liability		2		2		0
Commodity Contract [Member]
Derivatives, Fair Value [Line Items]
Matured derivative financial instruments		5	$ 15	57	$ (1)
Derivative Asset, Fair Value, Gross Asset		7		7		15
Derivative Liability, Fair Value, Gross Liability		18		18		0
Derivative Asset, Fair Value, Gross Liability		4		4		0
Derivative Liability, Fair Value, Gross Asset		4		4		0
Derivative Asset		3		3		15
Derivative Liability		14		14		0
Embedded Derivative Financial Instruments [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset		30		30		169
Derivative Liability, Fair Value, Gross Liability		134		134		21
Derivative Asset, Fair Value, Gross Liability		0		0		1
Derivative Liability, Fair Value, Gross Asset		0		0		1
Derivative Asset		30		30		168
Derivative Liability		134		134		20
Designated as Hedging Instrument [Member] | Commodity Contract [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset		$ 2		$ 2		15
Derivative, Nonmonetary Notional Amount, Mass | lb				84
Derivative, Average Forward Price | $ / lb		4.23		4.23
Designated as Hedging Instrument [Member] | Forward Contracts [Member]
Derivatives, Fair Value [Line Items]
Derivative, Nonmonetary Notional Amount, Mass | lb	150
Not Designated as Hedging Instrument [Member] | Embedded Derivative Financial Instruments [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset		$ 30		$ 30		169
Derivative Liability, Fair Value, Gross Liability		$ 134		$ 134		21
Not Designated as Hedging Instrument [Member] | Forward Contracts [Member]
Derivatives, Fair Value [Line Items]
Derivative, Nonmonetary Notional Amount, Mass | lb				9
Derivative, Average Forward Price | $ / lb		4.23		4.23
Future [Member] | Not Designated as Hedging Instrument [Member] | FMC's Copper Futures and Swap Contracts [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability		$ 14		$ 14		0
Commodity Contract [Member] | Not Designated as Hedging Instrument [Member] | Forward Contracts [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset		5		5		0
Derivative Liability, Fair Value, Gross Liability		$ 4		$ 4		$ 0
Copper | Short [Member] | Not Designated as Hedging Instrument [Member] | Embedded Derivative Financial Instruments [Member]
Derivatives, Fair Value [Line Items]
Derivative Average Market Price | $ / lb		4.05		4.05
Derivative, Nonmonetary Notional Amount, Mass | lb				548
Derivative, Average Forward Price | $ / lb		4.28		4.28
Copper | Long [Member] | Not Designated as Hedging Instrument [Member] | Embedded Derivative Financial Instruments [Member]
Derivatives, Fair Value [Line Items]
Derivative Average Market Price | $ / lb		4.05		4.05
Derivative, Nonmonetary Notional Amount, Mass | lb				116
Derivative, Average Forward Price | $ / lb		4.31		4.31
Gold | Short [Member] | Not Designated as Hedging Instrument [Member] | Embedded Derivative Financial Instruments [Member]
Derivatives, Fair Value [Line Items]
Derivative Average Market Price | $ / oz		1,738		1,738
Derivative, Nonmonetary Notional Amount, Mass | oz				196
Derivative, Average Forward Price | $ / oz		1,790		1,790
Sales [Member] | Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Embedded Derivative, Gain (Loss) on Embedded Derivative, Net		$ (111)	109	$ 201	57
Sales [Member] | Copper | Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Embedded Derivative, Gain (Loss) on Embedded Derivative, Net		(102)	94	223	18
Sales [Member] | gold and other | Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Embedded Derivative, Gain (Loss) on Embedded Derivative, Net		(9)	15	(22)	39
Cost of Sales [Member] | Not Designated as Hedging Instrument [Member] | Forward Contracts [Member]
Derivatives, Fair Value [Line Items]
Matured derivative financial instruments		$ 1	$ (7)	$ (12)	$ 12

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