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ENVIRONMENTAL LIABILITIES AND EXPENDITURES (Details) | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 31, 2016 mi | Sep. 30, 2016 USD ($) | Dec. 31, 2020 USD ($) site | Dec. 31, 2019 USD ($) site | Dec. 31, 2018 USD ($)
Environmental remediation reserves |  |  |  |  |
Number of sites |  |  | 170 | 177 |
Environmental remediation reserves, current, included in accrued liabilities | $ |  |  | $ 123,000,000 | $ 162,000,000 |
Environmental remediation reserves, noncurrent, included in deferred credits and other liabilities - other | $ |  |  | 1,028,000,000 | 1,035,000,000 |
Remediation balance | $ |  |  | 1,151,000,000 | 1,197,000,000 |
Environmental reserves, exceeding $ ten million, threshold value | $ |  |  | $ 10,000,000 |  |
Environmental reserves, exceeding $ ten million, number of sites |  |  | 19 |  |
Environmental reserves, range between zero to $ one million site category, number of sites |  |  | 96 |  |
Remediation Expenses | $ |  |  | $ 36,000,000 | $ 112,000,000 | $ 47,000,000
Percent of reserve to be funded over the next three to four years |  |  | 45.00% |  |
Minimum period of expending second half of environmental reserves |  |  | 10 years |  |
Environmental remediation additional loss range | $ |  |  | $ 1,100,000,000 |  |
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 | $ |  |  | $ 1,000,000 |  |
Period of expending 40 percent of environmental reserves |  |  | 4 years |  |
NPL sites |  |  |  |  |
Environmental remediation reserves |  |  |  |  |
Number of sites |  |  | 35 | 36 |
Remediation balance | $ |  |  | $ 447,000,000 | $ 463,000,000 |
Number of sites with significant environmental remediation reserves |  |  | 5 |  |
Percentage of environmental reserves accounted for by associated sites |  |  | 92.00% |  |
Number of sites indemnified by third party |  |  | 17 |  |
Third-party sites |  |  |  |  |
Environmental remediation reserves |  |  |  |  |
Number of sites |  |  | 69 | 74 |
Remediation balance | $ |  |  | $ 293,000,000 | $ 311,000,000 |
Number of sites with significant environmental remediation reserves |  |  | 7 |  |
Percentage of environmental reserves accounted for by associated sites |  |  | 76.00% |  |
Number of sites indemnified by third party |  |  | 69 |  |
Number of sites not indemnified by third party |  |  | 69 |  |
Occidental-operated sites |  |  |  |  |
Environmental remediation reserves |  |  |  |  |
Number of sites |  |  | 17 | 17 |
Remediation balance | $ |  |  | $ 144,000,000 | $ 154,000,000 |
Number of sites with significant environmental remediation reserves |  |  | 2 |  |
Percentage of environmental reserves accounted for by associated sites |  |  | 70.00% |  |
Closed or non-operated Occidental sites |  |  |  |  |
Environmental remediation reserves |  |  |  |  |
Number of sites |  |  | 49 | 50 |
Remediation balance | $ |  |  | $ 267,000,000 | $ 269,000,000 |
Number of sites with significant environmental remediation reserves |  |  | 5 |  |
Percentage of environmental reserves accounted for by associated sites |  |  | 70.00% |  |
Maxus |  |  |  |  |
Environmental remediation reserves |  |  |  |  |
Number of sites indemnified by third party |  |  | 9 |  |
Passaic River |  |  |  |  |
Environmental remediation reserves |  |  |  |  |
Stretch of Lower Passaic river requiring remedial actions | mi | 8.3 |  |  |  |
River stretch which may require remedial actions | mi | 9 |  |  |  |
Clean-up estimated cost | $ |  | $ 165,000,000 |  |  |

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