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ENVIRONMENTAL LIABILITIES AND EXPENDITURES (Tables)
12 Months Ended
Dec. 31, 2020
Environmental Remediation Obligations [Abstract]  
Schedule of current and non-current environmental remediation reserves by categories of sites
20202019
millions, except number of sitesNumber of SitesRemediation BalanceNumber of SitesRemediation Balance
NPL sites35 $447 36 $463 
Third-party sites69 293 74 311 
Occidental-operated sites17 144 17 154 
Closed or non-operated Occidental sites49 267 50 269 
Total170 $1,151 177 $1,197