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Financial Instruments (Unaudited) Unsettled Derivatives (Details) (USD $) In Millions, unless otherwise specified | Jun. 30, 2013 | Dec. 31, 2012
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |  |  |
Paid to brokers associated with margin requirements | $ 20 |  | $ 7 |
Derivative Asset | 61 |  | 33 |
Derivative Liability | 223 |  | 20 |
Trade Accounts Receivable [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative Asset | 7 |  | 24 |
Derivative Liability | 95 |  | 9 |
Other Current Assets [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative Asset | 49 |  | 5 |
Derivative Liability | 0 |  | 0 |
Other Assets [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative Asset | 1 |  | 0 |
Derivative Liability | 0 |  | 0 |
Accounts Payable and Accrued Liabilities [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative Asset | 4 |  | 4 |
Derivative Liability | 71 |  | 11 |
Other Liabilities [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative Asset | 0 |  | 0 |
Derivative Liability | 57 |  | 0 |
Commodity Contract [Member] | Derivatives not designated as hedging instruments |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Asset position | 92 |  | 41 |
Liability position | 254 |  | 28 |
Derivative Asset, Fair Value, Gross Liability | 31 |  | 8 |
Derivative Liability, Fair Value, Gross Asset | 31 |  | 8 |
Derivative Asset | 61 |  | 33 |
Derivative Liability | 223 |  | 20 |
Commodity Contract [Member] | Copper Derivatives [Member] | Derivatives not designated as hedging instruments |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Asset position | 0 |  | 5 |
Liability position | 17 |  | 1 |
Derivative Asset, Fair Value, Gross Liability | 0 |  | 0 |
Derivative Liability, Fair Value, Gross Asset | 0 |  | 0 |
Derivative Asset | 0 |  | 5 |
Derivative Liability | 17 |  | 1 |
Commodity Contract [Member] | Copper futures and swap contracts [Member] | Derivatives not designated as hedging instruments |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Asset position | 0 | [1] | 5 | [1]
Liability position | 14 | [1] | 1 | [1]
Commodity Contract [Member] | Copper forward contracts [Member] | Derivatives not designated as hedging instruments |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Liability position | 3 |  | 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 | 11 |  | 36 |
Liability position | 121 |  | 27 |
Derivative Asset, Fair Value, Gross Liability | 0 |  | 8 |
Derivative Liability, Fair Value, Gross Asset | 0 |  | 8 |
Derivative Asset | 11 |  | 28 |
Derivative Liability | 121 |  | 19 |
Commodity Contract [Member] | Crude Oil and Natural Gas Derivatives [Member] | Derivatives not designated as hedging instruments |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Asset position | 81 |  | 0 |
Liability position | 116 |  | 0 |
Derivative Asset, Fair Value, Gross Liability | 31 |  | 0 |
Derivative Liability, Fair Value, Gross Asset | 31 |  | 0 |
Derivative Asset | 50 |  | 0 |
Derivative Liability | 85 |  | 0 |
Commodity Contract [Member] | Crude Oil and Natural Gas Swaps [Member] | Derivatives not designated as hedging instruments |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Asset position | 81 |  | 0 |
Crude Oil Options [Member] | Embedded derivatives in provisional sales/purchases contracts [Member] | Derivatives not designated as hedging instruments |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Liability position | 116 |  | 0 |
Deferred Option Premiums and Accrued Interest [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative Liability | $ 478 |  |  |
[1] | FCX paid $20 million to brokers at June 30, 2013, and $7 million at December 31, 2012, for margin requirements (recorded in other current assets).

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