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Environmental Liabilities and Expenditures (Tables)
6 Months Ended
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 sitesNumber of SitesRemediation Balance
NPL sites37  $458  
Third-party sites73  292  
Occidental-operated sites17  148  
Closed or non-operated Occidental sites50  262  
Total177  $1,160