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Environmental Liabilities and Expenditures (Tables) | 6 Months Ended
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Jun. 30, 2021
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, 2021. The current portion, $123 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 |  | 32 |  |  | $ | 438 |
Third-party sites |  | 68 |  |  | 299 |
Occidental-operated sites |  | 17 |  |  | 136 |
Closed or non-operated Occidental sites |  | 49 |  |  | 270 |
Total |  | 166 |  |  | $ | 1,143 |

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