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ENVIRONMENTAL LIABILITIES AND EXPENDITURES (Details) | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 31, 2016 mi | Sep. 30, 2016 USD ($) | Dec. 31, 2018 USD ($) site category | Dec. 31, 2017 USD ($) site | Dec. 31, 2016 USD ($) site
Environmental remediation reserves |  |  |  |  |
Number of Sites | site |  |  | 145 | 148 | 147
Environmental remediation reserves, current, included in accrued liabilities |  |  | $ 120,000,000 | $ 137,000,000 | $ 131,000,000
Environmental remediation reserves, noncurrent, included in deferred credits and other liabilities - other |  |  | $ 762,000,000 | 728,000,000 | 739,000,000
Number of non-NPL sites categories | category |  |  | 3 |  |
Reserve Balance |  |  | $ 882,000,000 | 865,000,000 | 870,000,000
Environmental reserves, exceeding $ ten million, threshold value |  |  | $ 10,000,000 |  |
Environmental reserves, exceeding $ ten million, number of sites | site |  |  | 16 |  |
Environmental reserves, range between zero to $ one million site category, number of sites | site |  |  | 87 |  |
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 |  |  | $ 1,100,000,000 |  |
Environmental costs, including certain estimates by segment |  |  |  |  |
Operating Expenses |  |  | 190,000,000 | 161,000,000 | 151,000,000
Capital Expenditures |  |  | 103,000,000 | 101,000,000 | 73,000,000
Oil and Gas |  |  |  |  |
Environmental costs, including certain estimates by segment |  |  |  |  |
Operating Expenses |  |  | 95,000,000 | 68,000,000 | 65,000,000
Capital Expenditures |  |  | 75,000,000 | 77,000,000 | 43,000,000
Chemical |  |  |  |  |
Environmental costs, including certain estimates by segment |  |  |  |  |
Operating Expenses |  |  | 80,000,000 | 78,000,000 | 75,000,000
Capital Expenditures |  |  | 23,000,000 | 18,000,000 | 25,000,000
Midstream and Marketing |  |  |  |  |
Environmental costs, including certain estimates by segment |  |  |  |  |
Operating Expenses |  |  | 15,000,000 | 15,000,000 | 11,000,000
Capital Expenditures |  |  | 5,000,000 | 6,000,000 | 5,000,000
Corporate |  |  |  |  |
Environmental costs, including certain estimates by segment |  |  |  |  |
Remediation Expenses |  |  | $ 47,000,000 | $ 39,000,000 | $ 61,000,000
NPL sites |  |  |  |  |
Environmental remediation reserves |  |  |  |  |
Number of Sites | site |  |  | 34 | 34 | 33
Reserve Balance |  |  | $ 458,000,000 | $ 457,000,000 | $ 461,000,000
Number of sites with significant environmental remediation reserves | site |  |  | 4 |  |
Percentage of environmental reserves accounted for by associated sites |  |  | 94.00% |  |
Number of sites indemnified by third party | site |  |  | 17 |  |
Third-party sites |  |  |  |  |
Environmental remediation reserves |  |  |  |  |
Number of Sites | site |  |  | 68 | 70 | 68
Reserve Balance |  |  | $ 168,000,000 | $ 157,000,000 | $ 163,000,000
Number of sites with significant environmental remediation reserves | site |  |  | 5 |  |
Percentage of environmental reserves accounted for by associated sites |  |  | 62.00% |  |
Number of sites indemnified by third party | site |  |  | 9 |  |
Number of sites not indemnified by third party | site |  |  | 68 |  |
Occidental-operated sites |  |  |  |  |
Environmental remediation reserves |  |  |  |  |
Number of Sites | site |  |  | 14 | 15 | 17
Reserve Balance |  |  | $ 115,000,000 | $ 108,000,000 | $ 106,000,000
Number of sites with significant environmental remediation reserves | site |  |  | 3 |  |
Percentage of environmental reserves accounted for by associated sites |  |  | 64.00% |  |
Closed or non-operated Occidental sites |  |  |  |  |
Environmental remediation reserves |  |  |  |  |
Number of Sites | site |  |  | 29 | 29 | 29
Reserve Balance |  |  | $ 141,000,000 | $ 143,000,000 | $ 140,000,000
Number of sites with significant environmental remediation reserves | site |  |  | 4 |  |
Percentage of environmental reserves accounted for by associated sites |  |  | 61.00% |  |
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 |  | $ 165,000,000 |  |  |
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 |  |  | $ 1,000,000 |  |
Period of expending 40 percent of environmental reserves |  |  | 4 years |  |

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- Definition The minimum number of future years, subsequent to the years of expenditures amounting to about the first half of the current environmental reserves, where in the entity anticipates expending the remaining reserves. + References No definition available. + Details
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