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Environmental Liabilities and Expenditures (Details) | 1 Months Ended | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Mar. 31, 2016 mi | Sep. 30, 2016 USD ($) | Jun. 30, 2020 USD ($) site | Dec. 31, 2019 USD ($)
Environmental remediation reserves |  |  |  |
Number of Sites | site |  |  | 177 |
Environmental remediation reserves, current, included in accrued liabilities |  |  | $ 1,160,000,000 |
Environmental remediation reserves, non-current, included in deferred credits and other liabilities - other |  |  | 1,000,000,000 | $ 1,035,000,000
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 |  |  | 100 |
Expected expend funds of environmental reserves (as a percent) |  |  | 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 |  |  | 37 |
Environmental remediation reserves, current, included in accrued liabilities |  |  | $ 458,000,000 |
Third-party sites |  |  |  |
Environmental remediation reserves |  |  |  |
Number of Sites | site |  |  | 73 |
Environmental remediation reserves, current, included in accrued liabilities |  |  | $ 292,000,000 |
Occidental-operated sites |  |  |  |
Environmental remediation reserves |  |  |  |
Number of Sites | site |  |  | 17 |
Environmental remediation reserves, current, included in accrued liabilities |  |  | $ 148,000,000 |
Closed or non-operated Occidental sites |  |  |  |
Environmental remediation reserves |  |  |  |
Number of Sites | site |  |  | 50 |
Environmental remediation reserves, current, included in accrued liabilities |  |  | $ 262,000,000 |
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 |  |  | 160,000,000 |
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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