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Financial Instruments (Unaudited) Unsettled Derivatives (Details) (USD $) In Millions, unless otherwise specified | Jun. 30, 2014 | Dec. 31, 2013
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |  |  |
Paid to brokers associated with margin requirements | $ 1 |  | $ 1 |
Derivative Asset | 62 |  | 59 |
Derivative Liability | 317 |  | 320 |
Trade Accounts Receivable [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative Asset | 55 |  | 53 |
Derivative Liability | 0 |  | 0 |
Other Current Assets [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative Asset | 7 |  | 6 |
Derivative Liability | 0 |  | 0 |
Accounts Payable and Accrued Liabilities [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative Asset | 0 |  | 0 |
Derivative Liability | 232 |  | 205 |
Other Liabilities [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative Asset | 0 |  | 0 |
Derivative Liability | 85 |  | 115 |
Commodity Contract [Member] | Derivatives not designated as hedging instruments |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Asset position | 63 |  | 69 |
Liability position | 318 |  | 330 |
Derivative Asset, Fair Value, Gross Liability | 1 |  | 10 |
Derivative Liability, Fair Value, Gross Asset | 1 |  | 10 |
Derivative Asset | 62 |  | 59 |
Derivative Liability | 317 |  | 320 |
Commodity Contract [Member] | Copper Derivatives [Member] | Derivatives not designated as hedging instruments |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Asset position | 8 |  | 6 |
Liability position | 1 |  | 1 |
Derivative Asset, Fair Value, Gross Liability | 1 |  | 0 |
Derivative Liability, Fair Value, Gross Asset | 1 |  | 0 |
Derivative Asset | 7 |  | 6 |
Derivative Liability | 0 |  | 1 |
Commodity Contract [Member] | Copper futures and swap contracts [Member] | Derivatives not designated as hedging instruments |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Asset position | 6 | [1] | 6 | [1]
Liability position | 1 | [1] | 0 | [1]
Commodity Contract [Member] | Copper forward contracts [Member] | Derivatives not designated as hedging instruments |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Asset position | 2 |  | 0 |
Liability position | 0 |  | 1 |
Commodity Contract [Member] | Embedded derivatives in provisional sales/purchases contracts [Member] | Derivatives not designated as hedging instruments |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Asset position | 55 |  | 63 |
Liability position | 12 |  | 16 |
Derivative Asset, Fair Value, Gross Liability | 0 |  | 10 |
Derivative Liability, Fair Value, Gross Asset | 0 |  | 10 |
Derivative Asset | 55 |  | 53 |
Derivative Liability | 12 |  | 6 |
Commodity Contract [Member] | Natural gas swaps [Member] | Derivatives not designated as hedging instruments |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Liability position | 7 |  | 4 |
Commodity Contract [Member] | Crude Oil and Natural Gas Derivatives [Member] | Derivatives not designated as hedging instruments |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Asset position | 0 |  | 0 |
Liability position | 305 |  | 313 |
Derivative Asset, Fair Value, Gross Liability | 0 |  | 0 |
Derivative Liability, Fair Value, Gross Asset | 0 |  | 0 |
Derivative Asset | 0 |  | 0 |
Derivative Liability | 305 |  | 313 |
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 | 298 | [2] | 309 | [2]
Deferred Option Premiums and Accrued Interest [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative Liability | $ 329 |  | $ 444 |
[1] | FCX paid $1 million to brokers at June 30, 2014, and at December 31, 2013, for margin requirements (recorded in other current assets).
[2] | Included $329 million at June 30, 2014, and $444 million at December 31, 2013, for deferred premiums and accrued interest.

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