SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - NARRATIVE (Details) $ in Millions		1 Months Ended	3 Months Ended		12 Months Ended
	Aug. 08, 2019	Jul. 31, 2022 USD ($) shares	Jun. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2022 USD ($) segment shares	Dec. 31, 2021 USD ($) shares	Dec. 31, 2020 USD ($)	Sep. 30, 2022 shares	Jun. 30, 2022 shares	Mar. 31, 2022 shares
Summary of Significant Accounting Policies [Line Items]
Number of reportable segments | segment					3
Limited partner interest					49.50%
Non-voting limited partner interest					2.00%
Equity method investment amounts					$ 3,176	$ 2,938
Common stock, outstanding (in shares) | shares					899,858,944	934,074,700		908,077,761	928,963,512	937,190,982
Assets					$ 72,609	$ 75,036	$ 80,064
Net sales					36,234	25,959	17,130
Trade receivables, net					4,281	4,208
Net capitalized costs attributable to unproved properties					12,600	14,800
Impairment and related charges			$ 8,600
Accrued liabilities for accrued payroll, commissions and related expenses					582	677
Accrual for taxes other than income taxes, current					544	445
Dividends payable					$ 289	$ 188
Derivative liability, statement of financial position					Accrued liabilities	Accrued liabilities
Minimum period of investigations and cleanup for Comprehensive Environmental Response, Compensation and Liability Act National Priorities List sites					10 years
Gain (loss) non-monetary exchange transactions					$ 340
Oil and gas
Summary of Significant Accounting Policies [Line Items]
Net sales					$ 27,165	$ 19,285	11,995
Impairment and related charges			$ 6,400	$ 581
Low end of range | Chemical
Summary of Significant Accounting Policies [Line Items]
The estimated useful lives of Occidental's chemical assets					3 years
High end of range | Chemical
Summary of Significant Accounting Policies [Line Items]
The estimated useful lives of Occidental's chemical assets					50 years
Outside North America
Summary of Significant Accounting Policies [Line Items]
Assets					$ 7,700
Net sales					$ 5,500
Proved and unproved non-core Permian | Oil and gas
Summary of Significant Accounting Policies [Line Items]
Impairment and related charges						$ 282	7,000
Ghana Assets
Summary of Significant Accounting Policies [Line Items]
Impairment and related charges							2,200
Disposal Group, Disposed of by Sale, Not Discontinued Operations | WES
Summary of Significant Accounting Policies [Line Items]
Number of shares sold (in shares) | shares		10,000,000			14,000,000	14,000,000
Net proceeds from sale of equity investment		$ 250			$ 250	$ 250
Gain on sale		$ 62			$ 102
Goodwill derecognized				1,200
WES
Summary of Significant Accounting Policies [Line Items]
Effective economic interest					51.70%
Equity method investment amounts					$ 2,006
Impairment and related charges				$ 1,200
Goodwill derecognized							$ 1,200
WES
Summary of Significant Accounting Policies [Line Items]
Non-voting general partner interest					2.30%
Pro-rata interest in net assets					$ 390
WES | WES Operating
Summary of Significant Accounting Policies [Line Items]
Limited partner interest	98.00%
Berkshire Hathaway
Summary of Significant Accounting Policies [Line Items]
Common stock, outstanding (in shares) | shares								194,000,000