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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 |  |

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