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Financial Instruments (Unaudited) Unsettled Derivatives (Details) - USD ($) $ in Millions | Jun. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |  |
Derivative Asset |  | $ 194 | $ 330
Derivative Liability |  | 70 | 99
Paid to brokers associated with margin requirements |  | 9 | 10
Trade Accounts Receivable [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative Asset |  | 3 | 5
Derivative Liability |  | 53 | 56
Other Current Assets [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative Asset |  | 174 | 316
Derivative Liability |  | 0 | 0
Accounts Payable and Accrued Liabilities [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative Asset |  | 17 | 9
Derivative Liability |  | 17 | 43
Commodity Contract [Member] | Derivatives not designated as hedging instruments |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Asset position |  | 195 | 331
Liability position |  | 71 | 100
Derivative Asset, Fair Value, Gross Liability |  | 1 | 1
Derivative Liability, Fair Value, Gross Asset |  | 1 | 1
Derivative Asset |  | 194 | 330
Derivative Liability |  | 70 | 99
Commodity Contract [Member] | Copper Derivatives [Member] | Derivatives not designated as hedging instruments |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Asset position |  | 0 | 0
Liability position |  | 6 | 7
Derivative Asset, Fair Value, Gross Liability |  | 0 | 0
Derivative Liability, Fair Value, Gross Asset |  | 0 | 0
Derivative Asset |  | 0 | 0
Derivative Liability |  | 6 | 7
Commodity Contract [Member] | Copper futures and swap contracts [Member] | Derivatives not designated as hedging instruments |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Liability position | [1] | 5 | 7
Commodity Contract [Member] | Copper forward contracts [Member] | Derivatives not designated as hedging instruments |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Liability position |  | 1 | 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 |  | 21 | 15
Liability position |  | 65 | 93
Derivative Asset, Fair Value, Gross Liability |  | 1 | 1
Derivative Liability, Fair Value, Gross Asset |  | 1 | 1
Derivative Asset |  | 20 | 14
Derivative Liability |  | 64 | 92
Commodity Contract [Member] | Crude Oil and Natural Gas Derivatives [Member] | Derivatives not designated as hedging instruments |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Asset position |  | 174 | 316
Liability position |  | 0 | 0
Derivative Asset |  | 174 | 316
Derivative Liability |  | 0 | 0
Commodity Contract [Member] | Crude Oil Options [Member] | Derivatives not designated as hedging instruments |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Asset position | [2] | 174 | 316
Deferred Option Premiums and Accrued Interest [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative Asset |  | $ 106 | $ 210
[1] | FCX paid $9 million to brokers at June 30, 2015, and $10 million at December 31, 2014, for margin requirements (recorded in other current assets).
[2] | Amounts are net of $106 million at June 30, 2015, and $210 million at December 31, 2014, for deferred premiums and accrued interest.

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