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Debt (Tables) | 6 Months Ended
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Jun. 30, 2018
Debt Disclosure [Abstract] |
Schedule of Debt | DEBT AND EQUITY The components of debt follow (in millions):
|  | June 30, 2018 |  | December 31, 2017
Senior notes and debentures: |  |  |  |
Issued by FCX |  | $ | 9,594 |  |  | $ | 11,429 |
Issued by Freeport Minerals Corporation (FMC) |  | 358 |  |  | 358 |
Issued by Freeport-McMoRan Oil & Gas LLC (FM O&G LLC) |  | — |  |  | 54 |
Cerro Verde credit facility |  | 1,171 |  |  | 1,269 |
Other |  | 4 |  |  | 7 |
Total debt a |  | 11,127 |  |  | 13,117 |
Less current portion of debt |  | (4 | ) |  | (1,414 | )
Long-term debt |  | $ | 11,123 |  |  | $ | 11,703 |
a. | Includes additions for unamortized fair value adjustments totaling $63 million at June 30, 2018 ($97 million at December 31, 2017), and is net of reductions for unamortized net discounts and unamortized debt issuance costs totaling $76 million at June 30, 2018 ($85 million at December 31, 2017).
Schedule of Extinguishment of Debt [Table Text Block] | A summary of these redemptions follows (in millions):
| Principal Amount |  | Net Adjustments |  | Book Value |  | Redemption Value |  | Gain
FCX 6.75% Senior Notes due 2022 | $ | 404 |  |  | $ | 22 |  |  | $ | 426 |  |  | $ | 418 |  |  | $ | 8 |
FM O&G LLC 6 7/8% Senior Notes due 2023 | 50 |  |  | 4 |  |  | 54 |  |  | 52 |  |  | 2 |
| $ | 454 |  |  | $ | 26 |  |  | $ | 480 |  |  | $ | 470 |  |  | $ | 10 |

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- Definition Tabular disclosure of information pertaining to short-term and long-debt instruments or arrangements, including but not limited to identification of terms, features, collateral requirements and other information necessary to a fair presentation. + References No definition available. + Details
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- Definition Tabular disclosure of debt extinguished which may include, amount of gain (loss), the income tax effect and the per share amount of the aggregate gain (loss), net of the related income tax. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=7516071&loc=d3e13374-112631 + Details
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