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INCOME TAXES (Reconciliation of U.S. federal statutory rate to effective tax rate) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Amount |  |  |  |
U.S. federal statutory tax rate | $ (1,016) | $ 1,215 | $ 4,945 |
Valuation allowance, net | 28 | (1,680) | (2,955) |
Foreign tax credit limitation | (159) | (598) | (228) |
Tax reform | 393 | 0 | 0 |
Mining royalty dispute | (129) | 0 | 0 |
Impairment of oil and gas properties | 0 | 520 | 0 |
Percentage depletion | 227 | 211 | 186 |
Withholding and other impacts on foreign earnings | (216) | (93) | (193) |
Effect of foreign rates different than the U.S. federal statutory rate | 17 | 45 | 12 |
State income taxes | (5) | 46 | 105 |
Other items, net | (23) | (37) | 79 |
(Provision for) benefit from income taxes | $ (883) | $ (371) | $ 1,951 |
Percent |  |  |  |
U.S. federal statutory tax rate | (35.00%) | (35.00%) | (35.00%) |
Valuation allowance, net | 1.00% | 48.00% | 21.00% |
Foreign tax credit limitation | (5.00%) | 17.00% | 2.00% |
Tax reform | 14.00% | (0.00%) | (0.00%) |
Mining royalty dispute | (5.00%) | (0.00%) | (0.00%) |
Impairment of oil and gas properties | (0.00%) | (15.00%) | (0.00%) |
Percentage depletion | 8.00% | (6.00%) | (1.00%) |
Withholding and other impacts on foreign earnings | (7.00%) | 3.00% | 1.00% |
Effect of foreign rates different than the U.S. federal statutory rate | 1.00% | (1.00%) | (0.00%) |
State income taxes | (1.00%) | (1.00%) | (1.00%) |
Other items, net | (1.00%) | 1.00% | (1.00%) |
(Provision for) benefit from income taxes | (30.00%) | 11.00% | (14.00%) |
Valuation allowances | $ 4,575 | $ 6,058 |  |
Impairment To Oil And Gas Properties |  |  |  |
Percent |  |  |  |
Valuation allowances |  | $ 1,600 | $ 3,300 |
Chili - Service of Internal Taxes | Foreign Tax Authority |  |  |  |
Percent |  |  |  |
U.S. federal statutory tax rate | (35.00%) | (35.00%) |  | (35.00%)
Other nondeductible expense |  |  | $ 13 |
Royalty Assessments | Cerro Verde | Cerro Verde Royalty Dispute |  |  |  |
Amount |  |  |  |
(Provision for) benefit from income taxes | $ (7) |  |  |
Royalty Assessments | October 2011 to 2013 | Cerro Verde | Cerro Verde Royalty Dispute |  |  |  |
Amount |  |  |  |
(Provision for) benefit from income taxes | (136) |  |  |
Percent |  |  |  |
Tax charges related to royalties dispute | 136 |  |  |
Royalty Assessments | December 2006 to Tax Year 2013 | Cerro Verde | Cerro Verde Royalty Dispute |  |  |  |
Amount |  |  |  |
(Provision for) benefit from income taxes | 129 |  |  |
Percent |  |  |  |
Tax charges related to royalties dispute | $ (129) |  |  |

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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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