Environmental Liabilities and Expenditures (Tables)

9 Months Ended

Sep. 30, 2021

Environmental Remediation Obligations [Abstract]

Schedule of Current and Non-Current Environmental Remediation Reserves by Categories of Sites

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	30	$	427
Third-party sites	69	298
Occidental-operated sites	16	131
Closed or non-operated Occidental sites	50	267
Total	165	$	1,123