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Environmental Liabilities and Expenditures (Tables) | 9 Months Ended
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Sep. 30, 2019
Environmental Remediation Obligations [Abstract] |
Schedule of current and non-current environmental remediation reserves by categories of sites | The following table presents Occidental’s current and non-current environmental remediation reserves as of September 30, 2019. The current portion, $149 million, is included in accrued liabilities and the non-current portion, $905 million, in deferred credits and other liabilities - environmental remediation reserves. The reserves are grouped as environmental remediation sites listed or proposed for listing by the United States Environmental Protection Agency (EPA) on the CERCLA National Priorities List (NPL) sites and three categories of non-NPL sites — third-party sites, Occidental-operated sites and closed or non-operated Occidental sites. Occidental continues to evaluate environmental liabilities assumed through the Merger with an initial determination that it will participate in or monitor remedial activities or proceedings at 42 sites. The underlying reserve balance for the environmental sites assumed through the Merger will change as more site-specific information and clean-up measures becomes available.
|  | Number of Sites |  | Reserve Balance (millions)
NPL sites |  | 34 |  |  | $ | 452 |
Third-party sites |  | 66 |  |  | 223 |
Occidental-operated sites |  | 14 |  |  | 110 |
Closed or non-operated Occidental sites |  | 29 |  |  | 127 |
Environmental sites assumed from the Merger |  | 42 |  |  | 142 |
Total |  | 185 |  |  | $ | 1,054 |

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