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Environmental Liabilities and Expenditures (Details) $ in Millions | 1 Months Ended | 3 Months Ended | 6 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | ---
Mar. 31, 2016 mi | Sep. 30, 2016 USD ($) | Jun. 30, 2019 USD ($) category | Sep. 30, 2019 USD ($) site | Dec. 31, 2018 USD ($)
Environmental remediation reserves |  |  |  |  |
Number of Sites | site |  |  |  | 185 |
Environmental remediation reserves, current, included in accrued liabilities |  |  | $ 149 |  |
Environmental remediation reserves, non-current, included in deferred credits and other liabilities - other |  |  | $ 905 | $ 905 | $ 762
Number of non-NPL sites categories | category |  |  | 3 |  |
Reserve Balance |  |  |  | $ 1,054 |
Environmental reserves, exceeding $ ten million, threshold value |  |  | $ 10 |  |
Environmental reserves, exceeding $ ten million, number of sites | site |  |  |  | 19 |
Environmental reserves, range between zero to $ one million site category, number of sites | site |  |  |  | 112 |
Expected expend funds of environmental reserves (as a percent) |  |  |  | 40.00% |
Minimum period of expending second half of environmental reserves |  |  | 10 years |  |
Environmental remediation additional loss range |  |  |  | $ 1,200 |
Low end of range |  |  |  |  |
Environmental remediation reserves |  |  |  |  |
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 |  |
Period of expending first half of environmental reserves |  |  | 4 years |  |
NPL sites |  |  |  |  |
Environmental remediation reserves |  |  |  |  |
Number of Sites | site |  |  |  | 34 |
Reserve Balance |  |  |  | $ 452 |
Third-party sites |  |  |  |  |
Environmental remediation reserves |  |  |  |  |
Number of Sites | site |  |  |  | 66 |
Reserve Balance |  |  |  | $ 223 |
Occidental-operated sites |  |  |  |  |
Environmental remediation reserves |  |  |  |  |
Number of Sites | site |  |  |  | 14 |
Reserve Balance |  |  |  | $ 110 |
Closed or non-operated Occidental sites |  |  |  |  |
Environmental remediation reserves |  |  |  |  |
Number of Sites | site |  |  |  | 29 |
Reserve Balance |  |  |  | $ 127 |
Environmental sites assumed from the Merger |  |  |  |  |
Environmental remediation reserves |  |  |  |  |
Number of Sites | site |  |  |  | 42 |
Reserve Balance |  |  |  | $ 142 |
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 |  |  |
Anadarko |  |  |  |  |
Environmental remediation reserves |  |  |  |  |
Number of Sites | site |  |  |  | 42 |

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