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Financial Instruments (Unaudited) Unsettled Derivatives (Details) - USD ($) $ in Millions | Mar. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |  |
Derivative Asset |  | $ 62 | $ 14
Derivative Liability |  | 24 | 86
Paid to brokers associated with margin requirements |  | 5 | 10
Trade Accounts Receivable [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative Asset |  | 59 | 9
Derivative Liability |  | 8 | 51
Accounts Payable and Accrued Liabilities [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative Asset |  | 3 | 5
Derivative Liability |  | 16 | 35
Commodity Contract [Member] | Derivatives not designated as hedging instruments |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Asset position |  | 70 | 20
Liability position |  | 32 | 92
Derivative Asset, Fair Value, Gross Liability |  | 8 | 6
Derivative Liability, Fair Value, Gross Asset |  | 8 | 6
Derivative Asset |  | 62 | 14
Derivative Liability |  | 24 | 86
Commodity Contract [Member] | Copper Derivatives [Member] | Derivatives not designated as hedging instruments |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Asset position |  | 4 | 1
Liability position |  | 8 | 11
Derivative Asset, Fair Value, Gross Liability |  | 4 | 1
Derivative Liability, Fair Value, Gross Asset |  | 4 | 1
Derivative Asset |  | 0 | 0
Derivative Liability |  | 4 | 10
Commodity Contract [Member] | Copper futures and swap contracts [Member] | Derivatives not designated as hedging instruments |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Asset position | [1] | 4 | 1
Liability position | [1] | 6 | 11
Commodity Contract [Member] | Copper forward contracts [Member] | Derivatives not designated as hedging instruments |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Liability position |  | 2 | 0
Commodity Contract [Member] | Embedded derivatives in provisional sales/purchases contracts [Member] | Derivatives not designated as hedging instruments |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Asset position |  | 66 | 19
Liability position |  | 24 | 81
Derivative Asset, Fair Value, Gross Liability |  | 4 | 5
Derivative Liability, Fair Value, Gross Asset |  | 4 | 5
Derivative Asset |  | 62 | 14
Derivative Liability |  | $ 20 | $ 76
[1] | FCX paid $5 million to brokers at March 31, 2016, and $10 million at December 31, 2015, for margin requirements (recorded in other current assets).

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