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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, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Amount |  |  |
U.S. federal statutory tax rate | $ (64) | $ (817) | $ (1,016)
Valuation allowance | (149) | 129 | 28
PT-FI historical contested tax disputes | (145) | 0 | 0
Percentage depletion | 118 | 141 | 227
Effect of foreign rates different than the U.S. federal statutory rate | (64) | (494) | 17
Withholding and other impacts on foreign earnings | (55) | (232) | (216)
Adjustment to deferred taxes | (49) | 0 | 0
Non-deductible permanent differences | (47) | (25) | (31)
Uncertain tax positions | (47) | (7) | (20)
U.S. tax reform | 29 | 94 | 393
Foreign tax credit limitation | (16) | (195) | (159)
State income taxes | 16 | 7 | (5)
Cerro Verde royalty disputef | 2 | (55) | (129)
Change in PT-FI tax rates | 0 | 504 | 0
Timok exploration project sale | (15) | 0 | 0
Other items, net | (24) | (41) | 28
Provision for income taxes | $ (510) | $ (991) | $ (883)
Percent |  |  |
U.S. federal statutory tax rate | (21.00%) | (21.00%) | (35.00%)
Valuation allowance | (49.00%) | 3.00% | 1.00%
PT-FI historical contested tax disputes | (47.00%) | 0.00% | 0.00%
Percentage depletion | 39.00% | 4.00% | 8.00%
Effect of foreign rates different than the U.S. federal statutory rate | (21.00%) | (13.00%) | 1.00%
Withholding and other impacts on foreign earnings | (18.00%) | (6.00%) | (7.00%)
Adjustment to deferred taxes | (16.00%) |  |
Non-deductible permanent differences | 15.00% | 1.00% | 1.00%
Uncertain tax positions | (15.00%) | 0.00% | (1.00%)
U.S. tax reform | 0.09 | 0.02 | 0.14
Foreign tax credit limitation | (5.00%) | (5.00%) | (5.00%)
State income taxes | 6.00% | 1.00% | (1.00%)
Cerro Verde royalty disputef | 1.00% | (1.00%) | (5.00%)
Change in PT-FI tax rates |  | 13.00% |
Timok exploration project sale | (5.00%) |  |
Other items, net | (9.00%) | (1.00%) | 1.00%
Provision for income taxes | (166.00%) | (25.00%) | (30.00%)
Valuation allowances | $ 4,576 | $ 4,507 |

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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to foreign income tax expense (benefit). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(h)(1)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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