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Environmental Liabilities and Expenditures (Tables) | 3 Months Ended
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Mar. 31, 2022
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, 2022. The current portion, $155 million, is included in accrued liabilities and the non-current portion, $933 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. EPA on the CERCLA 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 |  | 30 |  |  | $ | 427 |
Third-party sites |  | 69 |  |  | 269 |
Occidental-operated sites |  | 15 |  |  | 120 |
Closed or non-operated Occidental sites |  | 52 |  |  | 272 |
Total |  | 166 |  |  | $ | 1,088 |

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