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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 ($) | Dec. 31, 2016 USD ($) site | Dec. 31, 2015 USD ($) site | Dec. 31, 2014 USD ($) site
Environmental remediation reserves |  |  |  |  |
Number of Sites | site |  |  | 147 | 149 | 145
Environmental remediation reserves, current, included in accrued liabilities |  |  | $ 131 | $ 70 | $ 79
Environmental remediation reserves, noncurrent, included in deferred credits and other liabilities - other |  |  | 739 | 316 | 255
Reserve Balance |  |  | 870 | 386 | 334
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 |  |  | 88 |  |
Minimum period of expending second half of environmental reserves |  |  | 10 years |  |
Environmental remediation additional loss range |  |  | $ 1,000 |  |
Environmental costs, including certain estimates by segment |  |  |  |  |
Operating Expenses |  |  | 151 | 180 | 194
Capital Expenditures |  |  | 73 | 167 | 189
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 |  |  | $ 65 | 93 | 103
Capital Expenditures |  |  | 43 | 122 | 143
Chemical |  |  |  |  |
Environmental costs, including certain estimates by segment |  |  |  |  |
Operating Expenses |  |  | 75 | 74 | 80
Capital Expenditures |  |  | 25 | 41 | 35
Midstream, Marketing and Other |  |  |  |  |
Environmental costs, including certain estimates by segment |  |  |  |  |
Operating Expenses |  |  | 11 | 13 | 11
Capital Expenditures |  |  | 5 | 4 | 11
Corporate |  |  |  |  |
Environmental costs, including certain estimates by segment |  |  |  |  |
Remediation Expenses |  |  | $ 61 | $ 117 | $ 79
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 |  |  | 33 | 34 | 30
Reserve Balance |  |  | $ 461 | $ 27 | $ 23
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 |  |  | 68 | 66 | 67
Reserve Balance |  |  | $ 163 | $ 128 | $ 101
Number of sites with significant environmental remediation reserves | site |  |  | 4 |  |
Percentage of environmental reserves accounted for by associated sites |  |  | 53.00% |  |
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 |  |  | 17 | 18 | 17
Reserve Balance |  |  | $ 106 | $ 107 | $ 107
Number of sites with significant environmental remediation reserves | site |  |  | 3 |  |
Percentage of environmental reserves accounted for by associated sites |  |  | 48.00% |  |
Closed or non-operated Occidental sites |  |  |  |  |
Environmental remediation reserves |  |  |  |  |
Number of Sites | site |  |  | 29 | 31 | 31
Reserve Balance |  |  | $ 140 | $ 124 | $ 103
Number of sites with significant environmental remediation reserves | site |  |  | 6 |  |
Percentage of environmental reserves accounted for by associated sites |  |  | 69.00% |  |

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