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ENVIRONMENTAL LIABILITIES AND EXPENDITURES (Details) $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 31, 2016 mi | Sep. 30, 2016 USD ($) | Dec. 31, 2017 USD ($) category site | Dec. 31, 2016 USD ($) site | Dec. 31, 2015 USD ($) site
Environmental remediation reserves |  |  |  |  |
Number of Sites | site |  |  | 148 | 147 | 149
Environmental remediation reserves, current, included in accrued liabilities |  |  | $ 137 | $ 131 | $ 70
Environmental remediation reserves, noncurrent, included in deferred credits and other liabilities - other |  |  | $ 728 | 739 | 316
Number of non-NPL sites categories | category |  |  | 3 |  |
Reserve Balance |  |  | $ 865 | 870 | 386
Environmental reserves, exceeding $ ten million, threshold value |  |  | $ 10 |  |
Environmental reserves, exceeding $ ten million, number of sites | site |  |  | 16 |  |
Environmental reserves, range between zero to $ one million site category, number of sites | site |  |  | 89 |  |
Percent of reserve to be funded over the next three to four years |  |  | 40.00% |  |
Minimum period of expending second half of environmental reserves |  |  | 10 years |  |
Environmental remediation additional loss range |  |  | $ 1,100 |  |
Environmental costs, including certain estimates by segment |  |  |  |  |
Operating Expenses |  |  | 161 | 151 | 180
Capital Expenditures |  |  | 101 | 73 | 167
Low end of range |  |  |  |  |
Environmental remediation reserves |  |  |  |  |
Environmental reserves, range between zero to $ one million site category |  |  | $ 0 |  |
Period of expending 40 percent of environmental reserves |  |  | 3 years |  |
High end of range |  |  |  |  |
Environmental remediation reserves |  |  |  |  |
Environmental reserves, range between zero to $ one million site category |  |  | $ 1 |  |
Period of expending 40 percent of environmental reserves |  |  | 4 years |  |
Oil and Gas |  |  |  |  |
Environmental costs, including certain estimates by segment |  |  |  |  |
Operating Expenses |  |  | $ 68 | 65 | 93
Capital Expenditures |  |  | 77 | 43 | 122
Chemical |  |  |  |  |
Environmental costs, including certain estimates by segment |  |  |  |  |
Operating Expenses |  |  | 78 | 75 | 74
Capital Expenditures |  |  | 18 | 25 | 41
Midstream and Marketing |  |  |  |  |
Environmental costs, including certain estimates by segment |  |  |  |  |
Operating Expenses |  |  | 15 | 11 | 13
Capital Expenditures |  |  | 6 | 5 | 4
Corporate |  |  |  |  |
Environmental costs, including certain estimates by segment |  |  |  |  |
Remediation Expenses |  |  | $ 39 | $ 61 | $ 117
Lower Passaic River |  |  |  |  |
Environmental remediation reserves |  |  |  |  |
Stretch of Lower Passaic river requiring remedial actions | mi | 8.3 |  |  |  |
Stretch of Lower Passaic river not covered by remedial actions | mi | 9 |  |  |  |
Clean-up estimated cost |  | $ 165 |  |  |
NPL sites |  |  |  |  |
Environmental remediation reserves |  |  |  |  |
Number of Sites | site |  |  | 34 | 33 | 34
Reserve Balance |  |  | $ 457 | $ 461 | $ 27
Number of sites with significant environmental remediation reserves | site |  |  | 3 |  |
Percentage of environmental reserves accounted for by associated sites |  |  | 95.00% |  |
Number of sites indemnified by third party | site |  |  | 17 |  |
Third-party sites |  |  |  |  |
Environmental remediation reserves |  |  |  |  |
Number of Sites | site |  |  | 70 | 68 | 66
Reserve Balance |  |  | $ 157 | $ 163 | $ 128
Number of sites with significant environmental remediation reserves | site |  |  | 5 |  |
Percentage of environmental reserves accounted for by associated sites |  |  | 60.00% |  |
Number of sites indemnified by third party | site |  |  | 9 |  |
Number of sites not indemnified by third party | site |  |  | 70 |  |
Occidental-operated sites |  |  |  |  |
Environmental remediation reserves |  |  |  |  |
Number of Sites | site |  |  | 15 | 17 | 18
Reserve Balance |  |  | $ 108 | $ 106 | $ 107
Number of sites with significant environmental remediation reserves | site |  |  | 3 |  |
Percentage of environmental reserves accounted for by associated sites |  |  | 49.00% |  |
Closed or non-operated Occidental sites |  |  |  |  |
Environmental remediation reserves |  |  |  |  |
Number of Sites | site |  |  | 29 | 29 | 31
Reserve Balance |  |  | $ 143 | $ 140 | $ 124
Number of sites with significant environmental remediation reserves | site |  |  | 5 |  |
Percentage of environmental reserves accounted for by associated sites |  |  | 62.00% |  |

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