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ENVIRONMENTAL LIABILITIES AND EXPENDITURES (Tables) | 12 Months Ended
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Dec. 31, 2019
Environmental Remediation Obligations [Abstract] |
Schedule of current and non-current environmental remediation reserves by categories of sites |
|  | 2019 |  | 2018
millions, except number of sites |  | Number of Sites |  |  | Remediation Balance |  |  | Number of Sites |  |  | Remediation Balance |
NPL sites |  | 36 |  |  | $ | 463 |  |  | 34 |  |  | $ | 458 |
Third-party sites |  | 74 |  |  | 311 |  |  | 68 |  |  | 168 |
Occidental-operated sites |  | 17 |  |  | 154 |  |  | 14 |  |  | 115 |
Closed or non-operated Occidental sites |  | 50 |  |  | 269 |  |  | 29 |  |  | 141 |
Total |  | 177 |  |  | $ | 1,197 |  |  | 145 |  |  | $ | 882 |

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