Environmental Liabilities and Expenditures (Details)	1 Months Ended		3 Months Ended
	Sep. 30, 2021 USD ($) mi	Mar. 31, 2016 mi	Mar. 31, 2022 USD ($) site	Sep. 30, 2016 USD ($)	Dec. 31, 2021 USD ($)
Environmental remediation reserves
Number of sites | site			166
Environmental remediation reserves, current, included in accrued liabilities			$ 1,088,000,000
Environmental remediation reserves, non-current, included in deferred credits and other liabilities - other			933,000,000		$ 944,000,000
Environmental reserves, exceeding $ ten million, threshold value			$ 10,000,000
Environmental reserves, exceeding $ ten million, threshold value, number of sites | site			20
Environmental reserves, range between zero to $ one million site category, number of sites | site			98
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			$ 1,300,000,000
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 reserves, current, included in accrued liabilities			$ 427,000,000
Third-party sites
Environmental remediation reserves
Number of sites | site			69
Environmental remediation reserves, current, included in accrued liabilities			$ 269,000,000
Occidental-operated sites
Environmental remediation reserves
Number of sites | site			15
Environmental remediation reserves, current, included in accrued liabilities			$ 120,000,000
Closed or non-operated Occidental sites
Environmental remediation reserves
Number of sites | site			52
Environmental remediation reserves, current, included in accrued liabilities			$ 272,000,000
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
Accrued liabilities
Environmental remediation reserves
Environmental remediation reserves, current, included in accrued liabilities			155,000,000
Deferred credits and other liabilities - other
Environmental remediation reserves
Environmental remediation reserves, non-current, included in deferred credits and other liabilities - other			$ 933,000,000