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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 |  |  |  |  |

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