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Environmental Liabilities and Expenditures (Tables) | 3 Months Ended
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Mar. 31, 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 March 31, 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 |  | 34 |  |  | $ | 445 |
Third-party sites |  | 69 |  |  | 303 |
Occidental-operated sites |  | 17 |  |  | 141 |
Closed or non-operated Occidental sites |  | 48 |  |  | 263 |
Total |  | 168 |  |  | $ | 1,152 |

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