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BUSINESS SEGMENTS (Long Lived Assets by Geographic Area) (Details) (USD $) In Millions, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
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Long Lived assets by geographic area of customer [Line Items] |  |  |  |  |  |
Long-Lived Assets | $ 49,412 us-gaap_NoncurrentAssets | [1] | $ 51,204 us-gaap_NoncurrentAssets | [1] | $ 24,589 us-gaap_NoncurrentAssets | [1]
United States [Member] |  |  |  |  |  |
Long Lived assets by geographic area of customer [Line Items] |  |  |  |  |  |
Long-Lived Assets | 29,468 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_US | [1] | 32,969 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_US | [1],[2] | 8,689 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_US | [1]
Indonesia [Member] |  |  |  |  |  |
Long Lived assets by geographic area of customer [Line Items] |  |  |  |  |  |
Long-Lived Assets | 6,961 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_ID | [1] | 5,799 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_ID | [1] | 5,127 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_ID | [1]
Democratic Republic of Congo [Member] |  |  |  |  |  |
Long Lived assets by geographic area of customer [Line Items] |  |  |  |  |  |
Long-Lived Assets | 4,071 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_CD | [1] | 3,994 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_CD | [1] | 3,926 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_CD | [1]
Peru [Member] |  |  |  |  |  |
Long Lived assets by geographic area of customer [Line Items] |  |  |  |  |  |
Long-Lived Assets | 6,848 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_PE | [1] | 5,181 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_PE | [1] | 3,933 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_PE | [1]
Chile [Member] |  |  |  |  |  |
Long Lived assets by geographic area of customer [Line Items] |  |  |  |  |  |
Long-Lived Assets | 1,542 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_CL | [1],[3] | 2,699 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_CL | [1] | 2,587 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_CL | [1]
Other [Member] |  |  |  |  |  |
Long Lived assets by geographic area of customer [Line Items] |  |  |  |  |  |
Long-Lived Assets | $ 522 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = fcx_OthersMember | [1] | $ 562 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = fcx_OthersMember | [1] | $ 327 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = fcx_OthersMember | [1]
[1] | Long-lived assets exclude deferred tax assets, intangible assets and goodwill.
[2] | Increased from 2012 primarily because of the PXP and MMR acquisitions.
[3] | Decreased from 2013 primarily because of the sale of Candelaria/Ojos.

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