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FINANCIAL INSTRUMENTS (Tables) | 12 Months Ended
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Dec. 31, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract] |
Unrealized gains (losses) for derivative financial instruments that are designated and qualify as fair value hedge transactions and for the related hedged item | A summary of gains (losses) recognized in revenues for derivative financial instruments related to commodity contracts that are designated and qualify as fair value hedge transactions, along with the unrealized gains (losses) on the related hedged item for the years ended December 31 follows:
| 2017 |  | 2016 |  | 2015
Copper futures and swap contracts: |  |  |  |  |
Unrealized gains (losses): |  |  |  |  |
Derivative financial instruments | $ | 4 |  |  | $ | 16 |  |  | $ | (3 | )
Hedged item – firm sales commitments | (4 | ) |  | (16 | ) |  | 3 |
Realized gains (losses): |  |  |  |  |
Matured derivative financial instruments | 30 |  |  | 1 |  |  | (34 | )
Schedule of Derivative Instruments | A summary of FCX’s embedded derivatives at December 31, 2017, follows:
| Open |  | Average Price Per Unit |  | Maturities
| Positions |  | Contract |  | Market |  | Through
Embedded derivatives in provisional sales contracts: |  |  |  |  |  |  |
Copper (millions of pounds) | 642 |  |  | $ | 3.06 |  |  | $ | 3.28 |  |  | May 2018
Gold (thousands of ounces) | 318 |  |  | 1,269 |  |  | 1,300 |  |  | March 2018
Embedded derivatives in provisional purchase contracts: |  |  |  |  |  |  |
Copper (millions of pounds) | 120 |  |  | 3.02 |  |  | 3.28 |  |  | April 2018
Cobalt (millions of pounds)a | 6 |  |  | 22.97 |  |  | 26.81 |  |  | March 2018
a. Relates to assets held for sale.
Realized and unrealized gains (losses) for derivative financial instruments that do not qualify as hedge transactions | A summary of the realized and unrealized gains (losses) recognized in operating income (loss) for commodity contracts that do not qualify as hedge transactions, including embedded derivatives, for the years ended December 31 follows:
| 2017 |  | 2016 |  | 2015
Embedded derivatives in provisional copper and gold |  |  |  |  |
sales contracts a | $ | 515 |  |  | $ | 266 |  |  | $ | (406 | )
Crude oil options and swaps a | — |  |  | (35 | ) |  | 87 |
Copper forward contracts b | (15 | ) |  | 5 |  |  | (15 | )
a. | Amounts recorded in revenues.
b. | Amounts recorded in cost of sales as production and delivery costs.
Fair Values of Unsettled Derivative Financial Instruments | A summary of the fair values of unsettled commodity derivative financial instruments follows:
| December 31,
| 2017 |  | 2016
Commodity Derivative Assets: |  |  |
Derivatives designated as hedging instruments: |  |  |
Copper futures and swap contracts | $ | 11 |  |  | $ | 9 |
Derivatives not designated as hedging instruments: |  |  |
Embedded derivatives in provisional copper and gold |  |  |  |  |
sales/purchase contracts | 155 |  |  | 137 |
Copper forward contracts | 1 |  |  | — |
Total derivative assets | $ | 167 |  |  | $ | 146 |
Commodity Derivative Liabilities: |  |  |
Derivatives designated as hedging instruments: |  |  |
Copper futures and swap contracts | $ | — |  |  | $ | 2 |
Derivatives not designated as hedging instruments: |  |  |
Embedded derivatives in provisional copper and gold |  |  |
sales/purchase contracts | 31 |  |  | 56 |
Copper forward contracts | 2 |  |  | — |
Total derivative liabilities | $ | 33 |  |  | $ | 58 |
Offsetting Liabilities [Table Text Block] | A summary of these unsettled commodity contracts that are offset in the balance sheet follows:
|  | Assets at December 31, |  | Liabilities at December 31,
|  | 2017 |  | 2016 |  | 2017 |  | 2016
Gross amounts recognized: |  |  |  |  |  |  |  |
Commodity contracts: |  |  |  |  |  |  |  |
Embedded derivatives in provisional |  |  |  |  |  |  |  |
sales/purchase contracts |  | $ | 155 |  |  | $ | 137 |  |  | $ | 31 |  |  | $ | 56 |
Copper derivatives |  | 12 |  |  | 9 |  |  | 2 |  |  | 2 |
|  | 167 |  |  | 146 |  |  | 33 |  |  | 58 |
Less gross amounts of offset: |  |  |  |  |  |  |  |
Commodity contracts: |  |  |  |  |  |  |  |
Embedded derivatives in provisional |  |  |  |  |  |  |  |
sales/purchase contracts |  | — |  |  | 12 |  |  | — |  |  | 12 |
Copper derivatives |  | 1 |  |  | 2 |  |  | 1 |  |  | 2 |
|  | 1 |  |  | 14 |  |  | 1 |  |  | 14 |
Net amounts presented in balance sheet: |  |  |  |  |  |  |  |
Commodity contracts: |  |  |  |  |  |  |  |
Embedded derivatives in provisional |  |  |  |  |  |  |  |
sales/purchase contracts |  | 155 |  |  | 125 |  |  | 31 |  |  | 44 |
Copper derivatives |  | 11 |  |  | 7 |  |  | 1 |  |  | — |
|  | $ | 166 |  |  | $ | 132 |  |  | $ | 32 |  |  | $ | 44 |
Balance sheet classification: |  |  |  |  |  |  |  |
Trade accounts receivable |  | $ | 151 |  |  | $ | 119 |  |  | $ | — |  |  | $ | 13 |
Other current assets |  | 11 |  |  | 7 |  |  | — |  |  | — |
Accounts payable and accrued liabilities |  | 4 |  |  | 6 |  |  | 32 |  |  | 31 |
|  | $ | 166 |  |  | $ | 132 |  |  | $ | 32 |  |  | $ | 44 |
Offsetting Assets [Table Text Block] | A summary of these unsettled commodity contracts that are offset in the balance sheet follows:
|  | Assets at December 31, |  | Liabilities at December 31,
|  | 2017 |  | 2016 |  | 2017 |  | 2016
Gross amounts recognized: |  |  |  |  |  |  |  |
Commodity contracts: |  |  |  |  |  |  |  |
Embedded derivatives in provisional |  |  |  |  |  |  |  |
sales/purchase contracts |  | $ | 155 |  |  | $ | 137 |  |  | $ | 31 |  |  | $ | 56 |
Copper derivatives |  | 12 |  |  | 9 |  |  | 2 |  |  | 2 |
|  | 167 |  |  | 146 |  |  | 33 |  |  | 58 |
Less gross amounts of offset: |  |  |  |  |  |  |  |
Commodity contracts: |  |  |  |  |  |  |  |
Embedded derivatives in provisional |  |  |  |  |  |  |  |
sales/purchase contracts |  | — |  |  | 12 |  |  | — |  |  | 12 |
Copper derivatives |  | 1 |  |  | 2 |  |  | 1 |  |  | 2 |
|  | 1 |  |  | 14 |  |  | 1 |  |  | 14 |
Net amounts presented in balance sheet: |  |  |  |  |  |  |  |
Commodity contracts: |  |  |  |  |  |  |  |
Embedded derivatives in provisional |  |  |  |  |  |  |  |
sales/purchase contracts |  | 155 |  |  | 125 |  |  | 31 |  |  | 44 |
Copper derivatives |  | 11 |  |  | 7 |  |  | 1 |  |  | — |
|  | $ | 166 |  |  | $ | 132 |  |  | $ | 32 |  |  | $ | 44 |
Balance sheet classification: |  |  |  |  |  |  |  |
Trade accounts receivable |  | $ | 151 |  |  | $ | 119 |  |  | $ | — |  |  | $ | 13 |
Other current assets |  | 11 |  |  | 7 |  |  | — |  |  | — |
Accounts payable and accrued liabilities |  | 4 |  |  | 6 |  |  | 32 |  |  | 31 |
|  | $ | 166 |  |  | $ | 132 |  |  | $ | 32 |  |  | $ | 44 |

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