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Environmental Liabilities and Expenditures (Tables) | 9 Months Ended
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Sep. 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 September 30, 2020. The current portion, $160 million, is included in accrued liabilities and the non-current portion, $975 million, 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 | 35 |  |  | $ | 451 |
Third-party sites | 72 |  |  | 284 |
Occidental-operated sites | 17 |  |  | 142 |
Closed or non-operated Occidental sites | 50 |  |  | 258 |
Total | 174 |  |  | $ | 1,135 |

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