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Financial Instruments (Unaudited) Unsettled Derivatives (Details) - USD ($) $ in Millions | Sep. 30, 2016 | Dec. 31, 2015
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |  |
Derivative Asset |  | $ 48 | $ 14
Derivative Liability |  | 8 | 86
Paid to brokers associated with margin requirements |  |  | 10
Trade Accounts Receivable [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative Asset |  | 48 | 9
Derivative Liability |  | 4 | 51
Accounts Payable and Accrued Liabilities [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative Asset |  | 0 | 5
Derivative Liability |  | 4 | 35
Commodity Contract [Member] | Derivatives not designated as hedging instruments |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Asset position |  | 50 | 20
Liability position |  | 10 | 92
Derivative Asset, Fair Value, Gross Liability |  | 2 | 6
Derivative Liability, Fair Value, Gross Asset |  | 2 | 6
Derivative Asset |  | 48 | 14
Derivative Liability |  | 8 | 86
Commodity Contract [Member] | Copper Derivatives [Member] | Derivatives not designated as hedging instruments |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Asset position |  | 3 | 1
Liability position |  | 1 | 11
Derivative Asset, Fair Value, Gross Liability |  | 1 | 1
Derivative Liability, Fair Value, Gross Asset |  | 1 | 1
Derivative Asset |  | 2 | 0
Derivative Liability |  | 0 | 10
Commodity Contract [Member] | Copper futures and swap contracts [Member] | Derivatives not designated as hedging instruments |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Asset position | [1] | 3 | 1
Liability position | [1] | 1 | 11
Commodity Contract [Member] | Embedded derivatives in provisional sales/purchases contracts [Member] | Derivatives not designated as hedging instruments |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Asset position |  | 47 | 19
Liability position |  | 9 | 81
Derivative Asset, Fair Value, Gross Liability |  | 1 | 5
Derivative Liability, Fair Value, Gross Asset |  | 1 | 5
Derivative Asset |  | 46 | 14
Derivative Liability |  | $ 8 | $ 76
[1] | FCX had paid a minimal amount to brokers at September 30, 2016, and $10 million at December 31, 2015, for margin requirements (recorded in other current assets).

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