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Financial Instruments (Unrealized gains losses) (Details) oz in Thousands, lb in Millions, $ in Millions		3 Months Ended		9 Months Ended
	Sep. 30, 2017 lb oz $ / lb $ / lb $ / oz	Sep. 30, 2017 USD ($) $ / lb $ / lb $ / oz	Sep. 30, 2016 USD ($)	Sep. 30, 2017 USD ($) $ / lb $ / lb $ / oz	Sep. 30, 2016 USD ($)
Commodity Contract [Member]
Unrealized gains (losses):
Derivative financial instruments | $		$ 0	$ 1	$ (1)	$ 11
Hedged item – firm sales commitments | $		0	(1)	1	(11)
Realized gains (losses):
Matured derivative financial instruments | $		$ 12	0	$ 21	(8)
Commodity Contract [Member] | Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Nonmonetary Notional Amount, Mass | lb	46
Derivative, Average Forward Price	2.83	2.83		2.83
Embedded Derivative Financial Instruments [Member] | Derivatives Not Designated as Hedging Instruments [Member] | Amounts recorded in Sales [Member]
Realized gains (losses):
Matured derivative financial instruments | $		$ 137	12	$ 297	88
Copper Forward Contracts [Member] | Derivatives Not Designated as Hedging Instruments [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Nonmonetary Notional Amount, Mass | lb	5
Derivative, Average Forward Price	2.95	2.95		2.95
Copper Forward Contracts [Member] | Derivatives Not Designated as Hedging Instruments [Member] | Amounts recorded in Cost of Sales
Realized gains (losses):
Matured derivative financial instruments | $		$ (9)	$ (1)	$ (14)	$ 4
Copper | Short [Member] | Embedded Derivative Financial Instruments [Member] | Derivatives Not Designated as Hedging Instruments [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Nonmonetary Notional Amount, Mass | lb	546
Derivative, Average Forward Price	2.84	2.84		2.84
Realized gains (losses):
Derivative Average Market Price	2.93	2.93		2.93
Copper | Long [Member] | Embedded Derivative Financial Instruments [Member] | Derivatives Not Designated as Hedging Instruments [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Nonmonetary Notional Amount, Mass | lb	155
Derivative, Average Forward Price	2.83	2.83		2.83
Realized gains (losses):
Derivative Average Market Price	2.93	2.93		2.93
Gold | Short [Member] | Embedded Derivative Financial Instruments [Member] | Derivatives Not Designated as Hedging Instruments [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Nonmonetary Notional Amount, Mass | oz	194
Derivative, Average Forward Price | $ / oz	1,318	1,318		1,318
Realized gains (losses):
Derivative Average Market Price | $ / oz	1,287	1,287		1,287

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Amount of gain (loss) from the increase (decrease) in fair value of derivative and nonderivative instruments designated as fair value hedging instruments recognized in the income statement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 25
-Section 50
-Paragraph 1
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Amount of the increase (decrease) in fair value of the hedged item in a fair value hedge recognized in the income statement.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
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-Section 50
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Nominal mass used to calculate payments on a derivative instrument.

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