Environmental Liabilities and Expenditures (Details)	1 Months Ended		3 Months Ended	6 Months Ended
	Sep. 30, 2021 USD ($) mi	Mar. 31, 2016 mi	Sep. 30, 2016 USD ($)	Jun. 30, 2022 USD ($) site	Dec. 31, 2021 USD ($)
Environmental remediation reserves
Number of Sites | site				167
Remediation Balance				$ 155,000,000
Environmental remediation reserves, non-current, included in deferred credits and other liabilities - other				918,000,000	$ 944,000,000
Remediation Balance				1,073,000,000
Environmental reserves, exceeding $ ten million, threshold value				$ 10,000,000
Environmental reserves, exceeding $ ten million, threshold value, number of sites | site				17
Environmental reserves, range between zero to $ one million site category, number of sites | site				99
Percent of reserve to be funded over the next three to four years				40.00%
Period of expending remaining environmental reserves (or more)				10 years
Environmental remediation additional loss range				$ 1,200,000,000
Low end of range
Environmental remediation reserves
Environmental reserves, range between zero to $ one million site category				$ 0
Period of expending first half of environmental reserves				3 years
High end of range
Environmental remediation reserves
Environmental reserves, range between zero to $ one million site category				$ 1,000,000
Period of expending first half of environmental reserves				4 years
NPL sites
Environmental remediation reserves
Number of Sites | site				30
Environmental remediation contingency, number of site categories | site				4
Remediation Balance				$ 449,000,000
Non-National Priorities List Sites
Environmental remediation reserves
Environmental remediation contingency, number of site categories | site				3
Third-party sites
Environmental remediation reserves
Number of Sites | site				70
Remediation Balance				$ 242,000,000
Occidental-operated sites
Environmental remediation reserves
Number of Sites | site				14
Remediation Balance				$ 114,000,000
Closed or non-operated Occidental sites
Environmental remediation reserves
Number of Sites | site				53
Remediation Balance				$ 268,000,000
Lower Passaic River
Environmental remediation reserves
Stretch of lower passaic river requiring remedial actions | mi		8.3
Stretch of lower passaic river not covered by remedial actions | mi	9	9
Clean-up estimated cost	$ 441,000,000		$ 165,000,000