SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - NARRATIVE (Details) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2023 USD ($) segment $ / shares shares	Dec. 31, 2022 USD ($) shares	Dec. 31, 2021 USD ($)	Sep. 30, 2023 shares	Jun. 30, 2023 shares	Mar. 31, 2023 shares
Summary of Significant Accounting Policies [Line Items]
Number of reportable segments | segment	3
Limited partner interest	48.80%
Non-voting limited partner interest	2.00%
Common stock, outstanding (in shares) | shares	879,463,103	899,858,944		877,701,484	884,681,888	891,551,244
Preferred stock, shares outstanding (in shares) | shares	84,897	100,000
Assets	$ 74,008	$ 72,609	$ 75,036
Net sales	28,325	36,234	25,959
Trade receivables, net	3,195	4,281
Net capitalized costs attributable to unproved properties	10,200	12,600
Accrued liabilities for accrued payroll, commissions and related expenses	693	582
Accrual for taxes other than income taxes, current	$ 618	$ 544
Derivative liability, statement of financial position	Accrued liabilities	Accrued liabilities
Dividends payable	$ 307	$ 289
Minimum period of investigations and cleanup for CERCLA sites	10 years
Gain on non-monetary exchange transactions	$ 120	$ 340
Land
Summary of Significant Accounting Policies [Line Items]
Impairment and related charges	180
Carbon Engineering, Ltd.
Summary of Significant Accounting Policies [Line Items]
Other intangible assets	960
Goodwill	668
Oil and gas | Land
Summary of Significant Accounting Policies [Line Items]
Impairment and related charges	$ 180
Low end of range
Summary of Significant Accounting Policies [Line Items]
Amortization period (in years)	9 years
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
Summary of Significant Accounting Policies [Line Items]
Amortization period (in years)	25 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	$ 7,800
Net sales	4,400
Proved and unproved non-core Permian | Oil and gas
Summary of Significant Accounting Policies [Line Items]
Impairment and related charges			$ 282
BlackRock, Inc.
Summary of Significant Accounting Policies [Line Items]
Equity method investment commitments	$ 550
Berkshire Hathaway
Summary of Significant Accounting Policies [Line Items]
Common stock, outstanding (in shares) | shares	244,000,000
Outstanding warrants (in shares) | shares	83,900,000
Preferred stock, shares outstanding (in shares) | shares	8,500,000,000
Berkshire Hathaway | Common Stock
Summary of Significant Accounting Policies [Line Items]
Option indexed to issuer's equity, strike price (in dollars per share) | $ / shares	$ 59.62
VIE's
Summary of Significant Accounting Policies [Line Items]
Construction in progress	$ 275
WES
Summary of Significant Accounting Policies [Line Items]
Non-voting general partner interest	2.30%
WES
Summary of Significant Accounting Policies [Line Items]
Effective economic interest	51.00%
Black Butte Coal Company
Summary of Significant Accounting Policies [Line Items]
Impairment of equity method investment	$ 29
Black Butte Coal Company | Oil and gas
Summary of Significant Accounting Policies [Line Items]
Impairment of equity method investment	$ 29