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Financial Instruments (Unsettled Derivatives) (Details) oz in Thousands, lb in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2021 USD ($) lb oz $ / oz $ / lb $ / lb	Mar. 31, 2020 USD ($)	Dec. 31, 2020 USD ($)
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	$ 126		$ 184
Derivative Liability, Fair Value, Gross Liability	68		21
Derivative Asset, Fair Value, Gross Liability	8		1
Derivative Liability, Fair Value, Gross Asset	8		1
Derivative Asset	118		183
Derivative Liability	60		20
Trade accounts receivable [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset	92		168
Derivative Liability	23		0
Accounts Payable and Accrued Liabilities
Derivatives, Fair Value [Line Items]
Derivative Asset	6		0
Derivative Liability	37		20
Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset	19		15
Derivative Liability	0		0
Other Assets
Derivatives, Fair Value [Line Items]
Derivative Asset	1		0
Derivative Liability	0		0
Commodity Contract [Member]
Derivatives, Fair Value [Line Items]
Matured derivative financial instruments	24	$ (9)
Derivative Asset, Fair Value, Gross Asset	21		15
Derivative Liability, Fair Value, Gross Liability	1		0
Derivative Asset, Fair Value, Gross Liability	1		0
Derivative Liability, Fair Value, Gross Asset	1		0
Derivative Asset	20		15
Derivative Liability	0		0
Embedded Derivative Financial Instruments [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	105		169
Derivative Liability, Fair Value, Gross Liability	67		21
Derivative Asset, Fair Value, Gross Liability	7		1
Derivative Liability, Fair Value, Gross Asset	7		1
Derivative Asset	98		168
Derivative Liability	60		20
Designated as Hedging Instrument [Member] | Commodity Contract [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	$ 18		15
Derivative, Nonmonetary Notional Amount, Mass | lb	66
Derivative, Average Forward Price | $ / lb	3.73
Not Designated as Hedging Instrument [Member] | Embedded Derivative Financial Instruments [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	$ 105		169
Derivative Liability, Fair Value, Gross Liability	$ 67		21
Not Designated as Hedging Instrument [Member] | Forward Contracts [Member]
Derivatives, Fair Value [Line Items]
Derivative, Nonmonetary Notional Amount, Mass | lb	23
Derivative, Average Forward Price | $ / lb	4.09
Commodity Contract [Member] | Not Designated as Hedging Instrument [Member] | Forward Contracts [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	$ 3		0
Derivative Liability, Fair Value, Gross Liability	$ 1		$ 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	3.99
Derivative, Nonmonetary Notional Amount, Mass | lb	486
Derivative, Average Forward Price | $ / lb	3.83
Copper | Long [Member] | Not Designated as Hedging Instrument [Member] | Embedded Derivative Financial Instruments [Member]
Derivatives, Fair Value [Line Items]
Derivative Average Market Price | $ / lb	3.99
Derivative, Nonmonetary Notional Amount, Mass | lb	123
Derivative, Average Forward Price | $ / lb	3.77
Gold | Short [Member] | Not Designated as Hedging Instrument [Member] | Embedded Derivative Financial Instruments [Member]
Derivatives, Fair Value [Line Items]
Derivative Average Market Price | $ / oz	1,689
Derivative, Nonmonetary Notional Amount, Mass | oz	151
Derivative, Average Forward Price | $ / oz	1,755
Sales [Member] | Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Embedded Derivative, Gain (Loss) on Embedded Derivative, Net	$ 179	(231)
Sales [Member] | Copper | Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Embedded Derivative, Gain (Loss) on Embedded Derivative, Net	207	(238)
Sales [Member] | gold and other | Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Embedded Derivative, Gain (Loss) on Embedded Derivative, Net	(28)	7
Cost of Sales [Member] | Not Designated as Hedging Instrument [Member] | Forward Contracts [Member]
Derivatives, Fair Value [Line Items]
Matured derivative financial instruments	$ (8)	$ 24

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