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Environmental Liabilities and Expenditures (Details) | 1 Months Ended | 3 Months Ended |
--- | --- | --- | ---
Mar. 31, 2016 mi | Mar. 31, 2021 USD ($) site | Sep. 30, 2016 USD ($) | Dec. 31, 2020 USD ($)
Environmental remediation reserves |  |  |  |
Number of Sites | site |  | 168 |  |
Environmental remediation reserves, current, included in accrued liabilities |  | $ 1,152,000,000 |  |
Environmental remediation reserves, non-current, included in deferred credits and other liabilities - other |  | 1,029,000,000 |  | $ 1,028,000,000
Environmental reserves, exceeding $ ten million, threshold value |  | $ 10,000,000 |  |
Environmental reserves, exceeding $ ten million, number of sites | site |  | 19 |  |
Environmental reserves, range between zero to $ one million site category, number of sites | site |  | 96 |  |
Percent of reserve to be funded over the next three to four years |  | 45.00% |  |
Period of expending remaining environmental reserves (or more) |  | 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 first half 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 first half of environmental reserves |  | 4 years |  |
NPL sites |  |  |  |
Environmental remediation reserves |  |  |  |
Number of Sites | site |  | 34 |  |
Environmental remediation reserves, current, included in accrued liabilities |  | $ 445,000,000 |  |
Third-party sites |  |  |  |
Environmental remediation reserves |  |  |  |
Number of Sites | site |  | 69 |  |
Environmental remediation reserves, current, included in accrued liabilities |  | $ 303,000,000 |  |
Occidental-operated sites |  |  |  |
Environmental remediation reserves |  |  |  |
Number of Sites | site |  | 17 |  |
Environmental remediation reserves, current, included in accrued liabilities |  | $ 141,000,000 |  |
Closed or non-operated Occidental sites |  |  |  |
Environmental remediation reserves |  |  |  |
Number of Sites | site |  | 48 |  |
Environmental remediation reserves, current, included in accrued liabilities |  | $ 263,000,000 |  |
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 |  |  | $ 165,000,000 |
Accrued liabilities |  |  |  |
Environmental remediation reserves |  |  |  |
Environmental remediation reserves, current, included in accrued liabilities |  | 123,000,000 |  |
Deferred credits and other liabilities - other |  |  |  |
Environmental remediation reserves |  |  |  |
Environmental remediation reserves, non-current, included in deferred credits and other liabilities - other |  | $ 1,000,000,000.0 |  |

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