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Financial Instruments (Unaudited) (Details) - Commodity Contract [Member] - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2016 | Mar. 31, 2015
Fair Value Hedging [Member] | Sales [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Derivative financial instruments |  | $ 7 | $ 6
Hedged item – firm sales commitments |  | (7) | (6)
Matured derivative financial instruments |  | (4) | (10)
Derivatives not designated as hedging instruments [Member] | Embedded derivatives in provisional sales contracts [Member] | Sales [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Realized and unrealized gains (losses) | [1] | 72 | (71)
Derivatives not designated as hedging instruments [Member] | Copper forward contracts [Member] | Cost of Sales [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Realized and unrealized gains (losses) | [2] | 7 | (1)
Derivatives not designated as hedging instruments [Member] | Plains Exploration & Production Company [Member] | Crude Oil Options [Member] | Sales [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Realized and unrealized gains (losses) | [1] | $ 0 | $ 52
[1] | Amounts recorded in revenues.
[2] | Amounts recorded in cost of sales as production and delivery costs.

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- Definition 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 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6886632&loc=d3e76258-113986 + Details
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- Definition Amount of the increase (decrease) in fair value of the hedged item in a fair value hedge 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 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6886632&loc=d3e76258-113986 + Details
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