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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - NARRATIVE (Details) $ in Millions |  | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Aug. 08, 2019 | Jun. 30, 2020 USD ($) | Mar. 31, 2020 USD ($) | Dec. 31, 2021 USD ($) segment | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Oct. 31, 2021 USD ($) | Jan. 31, 2020 USD ($) | Sep. 30, 2019 USD ($)
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Number of reportable segments | segment |  |  |  | 3 |  |  |  |  |
Equity method investment amounts |  |  |  | $ 2,938 | $ 3,250 |  |  |  |
Assets |  |  |  | 75,036 | 80,064 | $ 107,190 |  |  |
Net sales |  |  |  | 25,959 | 17,130 | 19,192 |  |  |
Trade receivables, net |  |  |  | 4,208 | 2,115 |  |  |  |
Net capitalized costs attributable to unproved properties |  |  |  | 14,800 | 18,600 |  |  |  |
Impairment and related charges |  | $ 8,600 |  |  |  | 285 |  |  |
Accrued liabilities for accrued payroll, commissions and related expenses |  |  |  | 677 | 461 |  |  |  |
Dividends payable |  |  |  | 188 | 189 |  |  |  |
Derivative financial instruments, included in accrued liabilities - current |  |  |  | $ 200 | 1,100 |  |  |  |
Minimum period of investigations and cleanup for Comprehensive Environmental Response, Compensation and Liability Act National Priorities List sites |  |  |  | 10 years |  |  |  |  |
Oil and gas |  |  |  |  |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Net sales |  |  |  | $ 19,285 | 11,995 | 14,048 |  |  |
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 |  |  |  | 4,200 |  |  |  |  |
Proved and unproved non-core Permian | Oil and gas |  |  |  |  |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Impairment and related charges |  |  |  | 282 | 7,000 |  |  |  |
Qatar ISSD |  |  |  |  |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Impairment and related charges |  |  |  |  |  | $ 39 |  |  |
Ghana Assets |  |  |  |  |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Impairment and related charges |  |  |  |  | 2,200 |  |  |  |
Disposed of by sale | Mozambique LNG Assets |  |  |  |  |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Sale consideration |  |  |  |  |  |  |  |  | $ 4,200
Disposed of by sale | South Africa Assets |  |  |  |  |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Sale consideration |  |  |  |  |  |  |  | $ 100 |
Disposed of by sale | Ghana Operations |  |  |  |  |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Sale consideration |  |  |  |  |  |  | $ 750 |  |
Discontinued Operations, Held-for-sale | Ghana Operations |  |  |  |  |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Sale consideration |  |  |  |  |  |  | $ 750 |  |
Discontinued Operations, Held-for-sale | Ghana Assets |  |  |  |  |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Impairment and related charges |  | $ 2,200 |  |  |  |  |  |  |
WES |  |  |  |  |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Equity method investment amounts |  |  |  | 2,000 |  |  |  |  |
Impairment and related charges |  |  | $ 1,200 |  |  |  |  |  |
Goodwill derecognized |  |  |  |  | $ 1,200 |  |  |  |
WES Operating | WES |  |  |  |  |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Limited partner interest | 98.00% |  |  |  |  |  |  |  |
WES |  |  |  |  |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Pro-rata interest in net assets |  |  |  | $ 362 |  |  |  |  |
Non-voting general partner interest |  |  |  | 2.20% |  |  |  |  |
Limited partner interest |  |  |  | 49.70% |  |  |  |  |
Non-voting limited partner interest |  |  |  | 2.00% |  |  |  |  |
Effective economic interest |  |  |  | 51.80% |  |  |  |  |

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