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ENVIRONMENTAL LIABILITIES AND EXPENDITURES (Details) | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2021 USD ($) | Mar. 31, 2016 mi | Sep. 30, 2016 USD ($) | Dec. 31, 2021 USD ($) site | Dec. 31, 2020 USD ($) site | Dec. 31, 2019 USD ($)
Environmental remediation reserves |  |  |  |  |  |
Number of sites |  |  |  | 165 | 170 |
Environmental remediation reserves, current, included in accrued liabilities | $ |  |  |  | $ 155,000,000 | $ 123,000,000 |
Environmental remediation reserves, noncurrent, included in deferred credits and other liabilities - other | $ |  |  |  | 944,000,000 | 1,028,000,000 |
Remediation balance | $ |  |  |  | 1,099,000,000 | 1,151,000,000 |
Environmental reserves, exceeding $ ten million, threshold value | $ |  |  |  | $ 10,000,000 |  |
Environmental reserves, exceeding $ ten million, number of sites |  |  |  | 20 |  |
Environmental reserves, range between zero to $ one million site category, number of sites |  |  |  | 96 |  |
Remediation Expenses | $ |  |  |  | $ 28,000,000 | $ 36,000,000 | $ 112,000,000
Percent of reserve to be funded over the next three to four years |  |  |  | 40.00% |  |
Minimum period of expending second half of environmental reserves |  |  |  | 10 years |  |
Environmental remediation additional loss range | $ |  |  |  | $ 1,300,000,000 |  |
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 |  |  |  | 30 | 35 |
Remediation balance | $ |  |  |  | $ 427,000,000 | $ 447,000,000 |
Number of sites with significant environmental remediation reserves |  |  |  | 4 |  |
Percentage of environmental reserves accounted for by associated sites |  |  |  | 96.00% |  |
Number of sites indemnified by third party |  |  |  | 14 |  |
Third-party sites |  |  |  |  |  |
Environmental remediation reserves |  |  |  |  |  |
Number of sites |  |  |  | 69 | 69 |
Remediation balance | $ |  |  |  | $ 273,000,000 | $ 293,000,000 |
Number of sites with significant environmental remediation reserves |  |  |  | 10 |  |
Percentage of environmental reserves accounted for by associated sites |  |  |  | 75.00% |  |
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 |  |  |  | 15 | 17 |
Remediation balance | $ |  |  |  | $ 122,000,000 | $ 144,000,000 |
Number of sites with significant environmental remediation reserves |  |  |  | 2 |  |
Percentage of environmental reserves accounted for by associated sites |  |  |  | 69.00% |  |
Closed or non-operated Occidental sites |  |  |  |  |  |
Environmental remediation reserves |  |  |  |  |  |
Number of sites |  |  |  | 51 | 49 |
Remediation balance | $ |  |  |  | $ 277,000,000 | $ 267,000,000 |
Number of sites with significant environmental remediation reserves |  |  |  | 5 |  |
Percentage of environmental reserves accounted for by associated sites |  |  |  | 75.00% |  |
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 | $ | $ 441,000,000 |  | $ 165,000,000 |  |  |

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