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Environmental Liabilities and Expenditures (Tables) | 6 Months Ended
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Jun. 30, 2020
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 liabilities as of June 30, 2020. The current portion, $160 million, is included in accrued liabilities and the non-current portion, $1.0 billion, in deferred credits and other liabilities - environmental remediation liabilities. Occidental’s environmental remediation sites are grouped into four categories: sites listed or proposed for listing by the U.S. Environmental Protection Agency (EPA) on the CERCLA National Priorities List (NPL) and three categories of non-NPL sites — third-party sites, Occidental-operated sites and closed or non-operated Occidental sites.
millions, except number of sites | Number of Sites |  | Remediation Balance
NPL sites | 37 |  |  | $ | 458 |
Third-party sites | 73 |  |  | 292 |
Occidental-operated sites | 17 |  |  | 148 |
Closed or non-operated Occidental sites | 50 |  |  | 262 |
Total | 177 |  |  | $ | 1,160 |

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