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ENVIRONMENTAL LIABILITIES AND EXPENDITURES (Tables) | 12 Months Ended
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Dec. 31, 2018
Environmental Remediation Obligations [Abstract] |
Schedule of current and non-current environmental remediation reserves by categories of sites |
($ amounts in millions) |  | 2018 |  | 2017 |  | 2016
|  | Number of Sites |  | Reserve Balance |  | Number of Sites |  | Reserve Balance |  | Number of Sites |  | Reserve Balance
NPL sites |  | 34 |  |  | $ | 458 |  |  | 34 |  |  | $ | 457 |  |  | 33 |  |  | $ | 461 |
Third-party sites |  | 68 |  |  | 168 |  |  | 70 |  |  | 157 |  |  | 68 |  |  | 163 |
Occidental-operated sites |  | 14 |  |  | 115 |  |  | 15 |  |  | 108 |  |  | 17 |  |  | 106 |
Closed or non-operated Occidental sites |  | 29 |  |  | 141 |  |  | 29 |  |  | 143 |  |  | 29 |  |  | 140 |
Total |  | 145 |  |  | $ | 882 |  |  | 148 |  |  | $ | 865 |  |  | 147 |  |  | $ | 870 |
Schedule of environmental cost for each segment | Occidental’s environmental costs, some of which include estimates, are presented below for each segment for each of the years ended December 31:
(in millions) |  | 2018 |  | 2017 |  | 2016
Operating Expenses |  |  |  |  |  |
Oil and Gas |  | $ | 95 |  |  | $ | 68 |  |  | $ | 65 |
Chemical |  | 80 |  |  | 78 |  |  | 75 |
Midstream and Marketing |  | 15 |  |  | 15 |  |  | 11 |
|  | $ | 190 |  |  | $ | 161 |  |  | $ | 151 |
Capital Expenditures |  |  |  |  |  |
Oil and Gas |  | $ | 75 |  |  | $ | 77 |  |  | $ | 43 |
Chemical |  | 23 |  |  | 18 |  |  | 25 |
Midstream and Marketing |  | 5 |  |  | 6 |  |  | 5 |
|  | $ | 103 |  |  | $ | 101 |  |  | $ | 73 |
Remediation Expenses |  |  |  |  |  |
Corporate |  | $ | 47 |  |  | $ | 39 |  |  | $ | 61 |

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