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CONTINGENCIES (Tax and Other Matters) (Details) - USD ($) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Mar. 31, 2016 | Dec. 31, 2014
Income Tax Examination [Line Items] |  |  |  |  |
Income Taxes Receivable, Noncurrent | $ 445,000,000 | $ 129,000,000 |  |  |
Proceeds from Income Tax Refunds | 329,000,000 | 247,000,000 | $ 334,000,000 |  |
PT-FI |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |
Penalty and Interest Assessment | 0 |  |  |  |
Income Tax Examination, Liability (Refund) Adjustment from Settlement with Taxing Authority |  |  |  | $ (196,000,000) |
Value Added Tax Receivable |  |  |  |  | $ 269,000,000
SUNAT | Cerro Verde |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |
Tax Assessment | 253,000,000 |  |  |  |
Penalty and Interest Assessment | 364,000,000 |  |  |  |
Income Tax Examination, Liability (Refund) Adjustment from Settlement with Taxing Authority | 617,000,000 |  |  |  |
Income Taxes Receivable, Noncurrent | 288,000,000 |  |  |  |
Increase (Decrease) in Income Taxes Receivable | 103,000,000 |  |  |  |
Indonesian Tax Authority | PT-FI |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |
Tax Assessment | 795,000,000 |  |  |  |
Income Tax Examination, Interest Accrued | 186,000,000 |  |  |  |
Income Tax Examination, Liability (Refund) Adjustment from Settlement with Taxing Authority | 981,000,000 |  |  |  |
2003 to 2005 | SUNAT | Cerro Verde |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |
Tax Assessment | 16,000,000 |  |  |  |
Penalty and Interest Assessment | 54,000,000 |  |  |  |
Income Tax Examination, Liability (Refund) Adjustment from Settlement with Taxing Authority | 70,000,000 |  |  |  |
2005 | Indonesian Tax Authority | PT-FI |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |
Tax Assessment | 77,000,000 |  |  |  |
Income Tax Examination, Interest Accrued | 37,000,000 |  |  |  |
Income Tax Examination, Liability (Refund) Adjustment from Settlement with Taxing Authority | 114,000,000 |  |  |  |
2005 | Indonesian Supreme Court [Member] | Maximum | PT-FI |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |
Loss Contingency, Estimate of Possible Loss | 1,000,000 |  |  |  |
2006 | SUNAT | Cerro Verde |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |
Tax Assessment | 7,000,000 |  |  |  |
Penalty and Interest Assessment | 59,000,000 |  |  |  |
Income Tax Examination, Liability (Refund) Adjustment from Settlement with Taxing Authority | 66,000,000 |  |  |  |
2007 to 2008 | SUNAT | Cerro Verde |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |
Tax Assessment | 33,000,000 |  |  |  |
Penalty and Interest Assessment | 31,000,000 |  |  |  |
Income Tax Examination, Liability (Refund) Adjustment from Settlement with Taxing Authority | 64,000,000 |  |  |  |
2007 | Indonesian Tax Authority | PT-FI |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |
Tax Assessment | 48,000,000 |  |  |  |
Income Tax Examination, Interest Accrued | 24,000,000 |  |  |  |
Income Tax Examination, Liability (Refund) Adjustment from Settlement with Taxing Authority | 72,000,000 |  |  |  |
Tax Year, 2008, 2010 to Tax Year 2011 | Indonesian Tax Authority | PT-FI |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |
Tax Assessment | 56,000,000 |  |  |  |
Income Tax Examination, Interest Accrued | 37,000,000 |  |  |  |
Income Tax Examination, Liability (Refund) Adjustment from Settlement with Taxing Authority | 93,000,000 |  |  |  |
2009 | SUNAT | Cerro Verde |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |
Tax Assessment | 59,000,000 |  |  |  |
Penalty and Interest Assessment | 49,000,000 |  |  |  |
Income Tax Examination, Liability (Refund) Adjustment from Settlement with Taxing Authority | 108,000,000 |  |  |  |
2010 | SUNAT | Cerro Verde |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |
Tax Assessment | 66,000,000 |  |  |  |
Penalty and Interest Assessment | 107,000,000 |  |  |  |
Income Tax Examination, Liability (Refund) Adjustment from Settlement with Taxing Authority | 173,000,000 |  |  |  |
2012 | Indonesian Tax Authority | PT-FI |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |
Tax Assessment | 125,000,000 |  |  |  |
Income Tax Examination, Interest Accrued | 1,000,000 |  |  |  |
Income Tax Examination, Liability (Refund) Adjustment from Settlement with Taxing Authority | 126,000,000 |  |  |  |
2013 | Indonesian Tax Authority | PT-FI |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |
Tax Assessment | 160,000,000 |  |  |  |
Income Tax Examination, Interest Accrued | 80,000,000 |  |  |  |
Income Tax Examination, Liability (Refund) Adjustment from Settlement with Taxing Authority | 240,000,000 |  |  |  |
2014 | Indonesian Tax Authority | PT-FI |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |
Tax Assessment | 160,000,000 |  |  |  |
Income Tax Examination, Interest Accrued | 7,000,000 |  |  |  |
Income Tax Examination, Liability (Refund) Adjustment from Settlement with Taxing Authority | 167,000,000 |  |  |  |
2015 | Indonesian Tax Authority | PT-FI |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |
Tax Assessment | 169,000,000 |  |  |  |
Income Tax Examination, Interest Accrued | 0 |  |  |  |
Income Tax Examination, Liability (Refund) Adjustment from Settlement with Taxing Authority | 169,000,000 |  |  |  |
Relating to 2011 through 2015 | Tax Authority, In Papau, Indonesia | PT-FI |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |
Loss Contingency, Estimate of Possible Loss | 400,000,000 |  |  |  |
Relating to 2011 through 2017 | Tax Authority, In Papau, Indonesia | PT-FI |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |
Loss Contingency, Estimate of Possible Loss | 530,000,000 |  |  |  |
2011, 2014 to 2017 | SUNAT | Cerro Verde |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |
Tax Assessment | 72,000,000 |  |  |  |
Penalty and Interest Assessment | 64,000,000 |  |  |  |
Income Tax Examination, Liability (Refund) Adjustment from Settlement with Taxing Authority | 136,000,000 |  |  |  |
2016 to 2017 | Tax Authority, In Papau, Indonesia | PT-FI |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |
Loss Contingency, Estimate of Possible Loss | 130,000,000 |  |  |  |
The year 2005 and the year 2007 [Member] | Indonesian Supreme Court [Member] | PT-FI |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |
Loss Contingency, Estimate of Possible Loss | 66,000,000 |  |  |  |
Cerro Verde |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |
Income Taxes Receivable, Noncurrent | 185,000,000 | 277,000,000 |  |  |
PT-FI |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |
Income Taxes Receivable, Noncurrent | 417,000,000 | $ 331,000,000 |  |  |
Penalties [Member] | Relating to 2011 through 2015 | Tax Authority, In Papau, Indonesia | PT-FI |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |
Loss Contingency, Estimate of Possible Loss | 239,000,000 |  |  |  |
Penalties [Member] | 2016 to 2017 | Tax Authority, In Papau, Indonesia | PT-FI |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |
Loss Contingency, Estimate of Possible Loss | $ 65,000,000 |  |  |  |
Other Liabilities [Member] | PT-FI |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |
Income Tax Examination, Liability (Refund) Adjustment from Settlement with Taxing Authority |  |  |  | $ (38,000,000) |

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