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ENVIRONMENTAL LIABILITIES AND EXPENDITURES (Tables) | 12 Months Ended
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Dec. 31, 2017
ENVIRONMENTAL LIABILITIES AND EXPENDITURES |
Schedule of current and non-current environmental remediation reserves by categories of sites |
($ amounts in millions) |  | 2017 |  | 2016 |  | 2015 |
|  | Number of Sites |  | Reserve Balance |  | Number of Sites |  | Reserve Balance |  | Number of Sites |  | Reserve Balance |
NPL sites |  | 34 |  | $ | 457 |  | 33 |  | $ | 461 |  | 34 |  | $ | 27 |
Third-party sites |  | 70 |  | 157 |  | 68 |  | 163 |  | 66 |  | 128 |
Occidental-operated sites |  | 15 |  | 108 |  | 17 |  | 106 |  | 18 |  | 107 |
Closed or non-operated Occidental sites |  | 29 |  | 143 |  | 29 |  | 140 |  | 31 |  | 124 |
Total |  | 148 |  | $ | 865 |  | 147 |  | $ | 870 |  | 149 |  | $ | 386 |
Schedule of environmental cost for each segment |
(in millions) |  | 2017 |  | 2016 |  | 2015 |
Operating Expenses |  |  |  |  |  |  |
Oil and Gas |  | $ | 68 |  | $ | 65 |  | $ | 93 |
Chemical |  | 78 |  | 75 |  | 74 |
Midstream and Marketing |  | 15 |  | 11 |  | 13 |
|  | $ | 161 |  | $ | 151 |  | $ | 180 |
Capital Expenditures |  |  |  |  |  |  |
Oil and Gas |  | $ | 77 |  | $ | 43 |  | $ | 122 |
Chemical |  | 18 |  | 25 |  | 41 |
Midstream and Marketing |  | 6 |  | 5 |  | 4 |
|  | $ | 101 |  | $ | 73 |  | $ | 167 |
Remediation Expenses |  |  |  |  |  |  |
Corporate |  | $ | 39 |  | $ | 61 |  | $ | 117 |

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- Definition Tabular disclosure of environmental loss contingencies by individual site. Does not include loss contingencies that are not environmental in nature. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 5.Y.Q2) -URI http://asc.fasb.org/extlink&oid=27011672&loc=d3e149879-122751 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 10 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13237-110859 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13207-110859 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13283-110859 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13296-110859 + Details
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