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ENVIRONMENTAL LIABILITIES AND EXPENDITURES (Tables) | 12 Months Ended
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Dec. 31, 2020
Environmental Remediation Obligations [Abstract] |
Schedule of current and non-current environmental remediation reserves by categories of sites |
|  | 2020 |  | 2019
millions, except number of sites |  | Number of Sites |  | Remediation Balance |  | Number of Sites |  | Remediation Balance
NPL sites |  | 35 |  |  | $ | 447 |  |  | 36 |  |  | $ | 463 |
Third-party sites |  | 69 |  |  | 293 |  |  | 74 |  |  | 311 |
Occidental-operated sites |  | 17 |  |  | 144 |  |  | 17 |  |  | 154 |
Closed or non-operated Occidental sites |  | 49 |  |  | 267 |  |  | 50 |  |  | 269 |
Total |  | 170 |  |  | $ | 1,151 |  |  | 177 |  |  | $ | 1,197 |

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