Oil and gas Oil And Gas Segment [Member] This member represents the oil and gas segment. Purchases from related party (as a percent) Percentage of Purchases Total Related Party Purchase Percentage of Purchases Total Related Party Purchase Operating Leases Lessee, Operating Lease, Liability, to be Paid, Fiscal Year Maturity [Abstract] 2026 Defined Benefit Plan, Expected Future Benefit Payment, Year Two Interest expense carryforward Deferred Tax Asset, Interest Carryforward Payments of long-term debt, net Repayments of Long-Term Debt Arbitration Demand Filed By Andes Petroleum Ecuador Ltd Arbitration Demand Filed By Andes Petroleum Ecuador Ltd [Member] The arbitration demand filed by Andes Petroleum Ecuador Ltd. Total debt and finance leases Long-Term Debt and Lease Obligation, Including Current Maturities Cover [Abstract] Cover [Abstract] Cash-Settled RSUs Cash Settled Restricted Stock Unit [Member] Represents stock based awards with shares for which sale is contractually or governmentally restricted for a given period of time, which are settled in cash at the time of vesting. Thereafter Lessee, Operating Lease, Liability, to be Paid, after Year Five Increase (decrease) in cash, cash equivalents, restricted cash and restricted cash equivalents Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect Schedule of operating lease maturities Lessee, Operating Lease, Liability, to be Paid, Maturity [Table Text Block] Foreign Foreign Plan [Member] Income Tax Jurisdiction [Domain] Income Tax Jurisdiction [Domain] Interest acquired, percent Business Acquisition, Percentage of Voting Interests Acquired Exploration expense Exploration Expense Trading Symbol Trading Symbol Minority interest in new venture Equity method investment ownership percentage Equity Method Investment, Ownership Percentage Comprehensive income Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest LONG-TERM DEBT, NET Long-term debt Long-Term Debt and Lease Obligation Commodity contract derivative asset, gross Derivative Asset, Subject to Master Netting Arrangement, before Offset Non-NEOs Non-NEOs [Member] Restricted cash and restricted cash equivalents included in long-term receivables and other assets, net Restricted Cash Equivalents, Noncurrent Income tax benefit recognized in the income statement Share-Based Payment Arrangement, Expense, Tax Benefit Permian EOR Business Unit Permian EOR Business Unit [Member] Permian EOR Business Unit Dividends on common stock (in dollars per share) Common Stock, Dividends, Per Share, Declared 2027 Defined Benefit Plan, Expected Future Benefit Payment, Year Three 7.200% debentures due 2029 Debentures 7.200 Percent Due 2029 [Member] Debentures 7.200 Percent Due 2029 [Member] Trade receivables, reserves Accounts Receivable, Allowance for Credit Loss, Current Position [Axis] Position [Axis] Disposal Group Name [Domain] Disposal Group Name [Domain] Preferred stock redemption – amortization of carrying value Increase in Carrying Amount of Redeemable Preferred Stock Purchased commodities Purchased Commodities Purchased Commodities Cash paid Share-Based Payment Arrangement, Cash Used to Settle Award EARNINGS PER SHARE Earnings Per Share, Policy [Policy Text Block] INVENTORIES Inventory, Policy [Policy Text Block] Non-Rule 10b5-1 Arrangement Adopted Non-Rule 10b5-1 Arrangement Adopted [Flag] Income from continuing operations Income from continuing operations Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest FAIR VALUE MEASUREMENTS Fair Value Disclosures [Text Block] Land Land [Member] Award Timing Disclosures [Line Items] Investment, Name [Domain] Investment, Name [Domain] Investing cash flows from operating leases Operating Lease, Payments, Use Portion at Fair Value Measurement Portion at Fair Value Measurement [Member] Business combination, contingent consideration, asset Business Combination, Contingent Consideration, Asset Lease Cost Lease, Cost [Abstract] Berkshire Warrant Berkshire Warrant [Member] Berkshire Warrant Operating lease, liability, noncurrent, statement of financial position Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] Purchase obligations in year two Purchase Obligation, to be Paid, Year Two TSRIs Total Shareholder Return Incentive [Member] Represents total shareholder return incentives (TSRIs). Revenue from Contract with Customer [Abstract] Revenue from Contract with Customer [Abstract] SEC Schedule, 12-09, Valuation Allowances and Reserves Type [Axis] SEC Schedule, 12-09, Valuation Allowances and Reserves Type [Axis] 5.200% senior notes due 2029 5.200% senior notes due 2029 Senior Notes 5.200 Percent Due 2029 [Member] Senior Notes 5.200 Percent Due 2029 United States United States UNITED STATES Dilutive securities (in shares) Weighted Average Number of Shares Outstanding, Diluted, Adjustment OTHER LONG-TERM ASSETS Other Assets, Noncurrent Leases [Abstract] Leases [Abstract] Antidilutive Securities, Name [Domain] Antidilutive Securities, Name [Domain] Payments for settlement Payments for Legal Settlements Corporate bonds Corporate Bond Securities [Member] Operating segments Operating Segments [Member] 5.625% senior notes due 2025 Senior Notes 5.625 Percent Due 2025 [Member] Senior Notes 5.625 Percent Due 2025 Net cash provided by operating activities Net Cash Provided by (Used in) Operating Activities Liquidation preference, par value percentage (in percent) Preferred Stock, Liquidation Preference, Par Value Percentage Preferred Stock, Liquidation Preference, Par Value Percentage CASH FLOW FROM OPERATING ACTIVITIES Net Cash Provided by (Used in) Operating Activities [Abstract] Components of accumulated other comprehensive income (loss) Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Secured Debt Secured Debt [Member] Powder River Basic And Delaware Basin Assets Powder River Basic And Delaware Basin Assets [Member] Powder River Basic And Delaware Basin Assets Accretion expense Asset Retirement Obligation, Accretion Expense Award Timing Method Award Timing Method [Text Block] Net periodic benefit costs Defined Benefit Plan, Net Periodic Benefit Cost (Credit) 7.875% senior notes due 2031 Senior Notes 7.875 Percent Due 2031 [Member] Senior Notes 7.875 Percent Due 2031 [Member] Trading Arrangements, by Individual Trading Arrangements, by Individual [Table] Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Weighted average lease term, finance lease Finance Lease, Weighted Average Remaining Lease Term ENVIRONMENTAL LIABILITIES AND EXPENDITURES Environmental Costs, Policy [Policy Text Block] Insider Trading Policies and Procedures [Line Items] Fair value of plan assets Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets, Plan Assets Proceeds received for divested assets Proceeds from Divestiture of Businesses Adjustment to Compensation, Amount Adjustment to Compensation Amount 8.500% senior notes due 2027 Senior Notes 8.500 Percent Due 2027 [Member] Senior Notes 8.500 Percent Due 2027 Compensation Amount Outstanding Recovery Compensation Amount Accrued liabilities Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accrued Liabilities Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accrued Liabilities Disposal Group Classification [Axis] Disposal Group Classification [Axis] Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table [Member] Entity Small Business Entity Small Business Company Selected Measure Amount Company Selected Measure Amount Tabular List, Table Tabular List [Table Text Block] Level 3 Fair Value, Inputs, Level 3 [Member] Deductions SEC Schedule, 12-09, Valuation Allowances and Reserves, Deduction Share-based Compensation Arrangement by Share-Based Payment Award Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] Issuance of debt upon approval Business Combination, Consideration Expected To Transfer Upon Closing, Liabilities Expected To Incur Business Combination, Consideration Expected To Transfer Upon Closing, Liabilities Expected To Incur Remediation balance Accrual for Environmental Loss Contingencies Assumed long-term rate of return on assets Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-Term Rate of Return on Plan Assets Oil and gas, quantity energy (in dollars per barrel of oil) Oil And Gas, Proved Reserve, Property Acquisition Cost Per Energy Oil And Gas, Proved Reserve, Property Acquisition Cost Per Energy Accrued liabilities Accrued liabilities Accrued Liabilities, Current Shares excluded from diluted shares (in shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Postretirement benefit accruals Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Postretirement Benefits Contract term Revenue From Contract With Customer, Contract Term Revenue From Contract With Customer, Contract Term Less: Discount Finance Lease, Liability, Undiscounted Excess Amount IMPAIRMENTS AND OTHER CHARGES Impairment or Disposal of Long-Lived Assets, Policy [Policy Text Block] Credit Facility [Domain] Credit Facility [Domain] Taxes other than on income Taxes, Miscellaneous Stock options, vested, weighted average strike price (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options Vested, Weighted Average Strike Price Share-based Compensation Arrangement by Share-based Payment Award, Options Vested, Weighted Average Strike Price Goodwill Goodwill Non-MAPD Non-Medicare Advantage Plan [Member] Non-Medicare Advantage Plan [Member] Income tax refunds received Tax refund Proceeds from Income Tax Refunds INVENTORIES Inventory Disclosure [Text Block] Entity Information [Line Items] Entity Information [Line Items] Options Share-Based Payment Arrangement, Option [Member] 2025 Lessee, Operating Lease, Liability, to be Paid, Year One Other financing, net Proceeds from (Payments for) Other Financing Activities Audit Information [Abstract] Audit Information Comprehensive income attributable to preferred and common stockholders Comprehensive Income (Loss), Net of Tax, Attributable to Parent Pension Benefits Pension Plan [Member] Income tax payable Accrued Income Taxes, Current Weighted average discount rate, finance lease Finance Lease, Weighted Average Discount Rate, Percent Other Effective Income Tax Rate Reconciliation, Other Adjustments, Percent BlackRock, Inc. BlackRock, Inc. [Member] BlackRock, Inc. 2025 Finance Lease, Liability, to be Paid, Year One Award Type [Axis] Award Type [Axis] Total deferred income tax liability, net Deferred Tax Liabilities, Net Schedule of property, plant and equipment, net by geographic area Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas [Table Text Block] PER COMMON SHARE Earnings Per Share, Basic [Abstract] Inventories Inventory, Gross CASH EQUIVALENTS AND RESTRICTED CASH EQUIVALENTS Cash and Cash Equivalents, Restricted Cash and Cash Equivalents, Policy [Policy Text Block] Diamond Alkali Superfund Site - Operable Unit Two Diamond Alkali Superfund Site - Operable Unit Two [Member] Diamond Alkali Superfund Site - Operable Unit Two Other Other Accrued Liabilities, Noncurrent Tender, purchase and repayments Repayments Repayments of Debt ICFR Auditor Attestation Flag ICFR Auditor Attestation Flag Noncontrolling interest Equity, Attributable to Noncontrolling Interest Schedule of cash equivalents and restricted cash equivalents Schedule of Cash and Cash Equivalents [Table Text Block] Continuing operations Continuing Operations [Member] Common stock, per share par value (in dollars per share) Common Stock, Par or Stated Value Per Share Existing Debt Existing Debt [Member] Existing Debt Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table] FOREIGN CURRENCY TRANSACTIONS Foreign Currency Transactions and Translations Policy [Policy Text Block] Revolving credit racility Revolving Credit Facility [Member] Expiration Date Trading Arrangement Expiration Date CASH FLOW FROM INVESTING ACTIVITIES Net Cash Provided by (Used in) Investing Activities [Abstract] Less: Net income allocated to participating securities Undistributed Earnings (Loss) Allocated to Participating Securities, Diluted Operating cash flow from continuing operations Net Cash Provided by (Used in) Operating Activities, Continuing Operations Net Working Capital and Other Purchase Price Adjustments Payments To Acquire Businesses, Gross, Working Capital Adjustments Payments To Acquire Businesses, Gross, Working Capital Adjustments All other revenues Revenue Not from Contract with Customer Current operating lease liabilities Operating Lease, Liability, Current Total Shareholder Return Amount Total Shareholder Return Amount Less: Net income allocated to participating securities Undistributed Earnings (Loss) Allocated to Participating Securities, Basic Equity Awards Adjustments, Footnote Equity Awards Adjustments, Footnote [Text Block] Environmental remediation reserves Site Contingency [Line Items] Liabilities incurred – capitalized to PP&E Asset Retirement Obligation, Liabilities Incurred Net operating loss carryforward Deferred Tax Assets, Operating Loss Carryforwards Less: foreign deferred tax asset in long-term receivables and other assets, net Deferred Tax Asset, Foreign, Long-Term Receivables And Noncurrent Assets, Net Deferred Tax Asset, Foreign, Long-Term Receivables And Noncurrent Assets, Net Debentures Debentures [Member] Debentures [Member] AOCI after-tax balances Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax Retirement Plan Name [Axis] Retirement Plan Name [Axis] Long-term debt Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-Term Debt NGL Natural Gas Liquids (NGL) [Member] Purchases of assets, businesses and equity investments, net Payments to Acquire Assets, Investing Activities Debt Instrument [Line Items] Debt Instrument [Line Items] Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] INTANGIBLES AND GOODWILL Goodwill and Intangible Assets, Policy [Policy Text Block] Additional losses Environmental Exit Costs, Reasonably Possible Additional Loss Railcars Railcars [Member] Railcars Accumulated depreciation, depletion and amortization Property, Plant, and Equipment and Finance Lease Right-of-Use Asset, Accumulated Depreciation and Amortization Total diluted weighted- average common shares (in shares) Weighted Average Number of Shares Outstanding, Diluted Summarized Balance Sheet Equity Method Investment Summarized Financial Information Assets and Liabilities and Equity [Abstract] Equity Method Investment Summarized Financial Information Assets and Liabilities and Equity [Abstract] Accrued liabilities Accrued Liabilities [Member] MNPI Disclosure Timed for Compensation Value MNPI Disclosure Timed for Compensation Value [Flag] Purchase obligations in year one Purchase Obligation, to be Paid, Year One Total stockholders’ equity Equity Equity, Attributable to Parent Gross long-term deferred tax assets Deferred Tax Assets, Gross Borrowings Proceeds from Issuance of Debt Construction in progress Construction in Progress, Gross Litigation Case [Axis] Litigation Case [Axis] Stretch of lower passaic river requiring remedial actions River Stretch Which Require Remedial Actions Represents the stretch of river which require remedial actions. Environmental reserves Deferred Tax Assets, Environmental Reserves The tax effect as of the balance sheet date of the amount of the estimated future tax deductions arising from currently non-deductible expenses in environmental reserves, which can only be deducted for tax purposes when such liabilities are actually incurred, and which can only be realized if sufficient tax-basis income is generated in future periods to enable the deduction to be taken. Valuation allowance on other deferred tax assets Other Deferred Tax Assets, Valuation Allowance Other Deferred Tax Assets, Valuation Allowance 6.125% senior notes due 2031 Senior Notes 6.125 Percent Due 2031 [Member] Senior Notes 6.125 Percent Due 2031 Charged to Other Accounts SEC Schedule, 12-09, Valuation Allowances and Reserves, Additions, Charge to Other Account Selling, general and administrative expense Selling, General and Administrative Expense Expenses under provisions of defined contribution and supplemental retirement plans Defined Contribution Plan, Cost Schedule of the activity of the asset retirement obligation Schedule of Change in Asset Retirement Obligation [Table Text Block] Number of companies excluded from settlement Number Of Companies Excluded From Settlement Number Of Companies Excluded From Settlement Aggregate number of shares authorized for issuance (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized Foreign currency revaluation on CAD denominated debt Foreign Currency Revaluation, Debt Foreign Currency Revaluation, Debt Document Fiscal Period Focus Document Fiscal Period Focus COMMON STOCK WARRANTS Embedded Derivative [Abstract] Due in four years Long-Term Debt, Maturity, Year Four Acquisition-related costs Business Combination, Acquisition Related Costs All Executive Categories All Executive Categories [Member] Statement of Financial Position Location, Balance [Domain] Statement of Financial Position Location, Balance [Domain] Occidental common stock share price (in dollars per share) Business Acquisition, Share Price Changed Peer Group, Footnote Changed Peer Group, Footnote [Text Block] Remaining life of options Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term Noncontrolling interest contributions, net Noncontrolling Interest, Period Increase (Decrease) ASSETS Assets [Abstract] Defined Benefit Plan and Other Postretirement Benefit Plan [Domain] Retirement Plan Type [Domain] Other comprehensive income (loss), net of tax Other Comprehensive Income (Loss), Net of Tax Document Type Document Type Derivative Contract [Domain] Derivative Contract [Domain] Average annual facility fees Line of Credit Facility, Commitment Fee Percentage Debt instrument, variable rate Debt Instrument, Interest Rate, Effective Percentage Actuarial (gain) loss Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) Schedule of industry segments Schedule of Segment Reporting Information, by Segment [Table Text Block] 5.550% senior notes due 2034 5.550% senior notes due 2034 Senior Notes 5.550 Percent Due 2034 [Member] Senior Notes 5.550 Percent Due 2034 7.500% senior notes due 2031 Senior Notes 7.500 Percent Due 2031 [Member] Senior Notes 7.500 Percent Due 2031 [Member] Natural gas commodity contracts Natural Gas Per Cubic Foot [Member] Information pertaining to commodity derivative contracts for the natural gas. Defined Benefit Plan [Table] Defined Benefit Plan [Table] Summary of Significant Accounting Policies [Table] Summary of Significant Accounting Policies [Table] The table describes the detailed summary of significant accounting policies. Net sales Sales [Member] High end of range Maximum Maximum [Member] Preferred stock, value, outstanding Preferred Stock, Value, Outstanding Equity Valuation Assumption Difference, Footnote Equity Valuation Assumption Difference, Footnote [Text Block] Antidilutive Securities [Axis] Antidilutive Securities [Axis] Accounts payable Amounts due to related parties Accounts Payable, Current Total lease liabilities Operating And Finance Lease, Liability Operating And Finance Lease, Liability Remediation expenses Environmental Remediation Expense, before Recovery Gains related to legal settlements Gain (Loss) from Litigation Settlement Services Related Party Transaction, Amounts of Transaction DEFERRED CREDITS AND OTHER LIABILITIES Deferred Credits and Other Liabilities [Abstract] Total lease cost Lease, Cost Statistical Measurement [Axis] Statistical Measurement [Axis] Non-Rule 10b5-1 Arrangement Terminated Non-Rule 10b5-1 Arrangement Terminated [Flag] Income from continuing operations before income taxes Income from continuing operations before income taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Thereafter Operating And Finance Lease, Liability, Payments, Due After Year Five Operating And Finance Lease, Liability, Payments, Due After Year Five Non-PEO NEO Average Total Compensation Amount Non-PEO NEO Average Total Compensation Amount Summarized Results of Operations Equity Method Investment Summarized Financial Information Summarized By Income Statement Line Items [Abstract] Equity Method Investment Summarized Financial Information Summarized By Income Statement Line Items Property, plant and equipment differences Deferred Tax Liabilities, Property, Plant and Equipment Production, property and other tax payments Payments for Other Taxes Name Outstanding Recovery, Individual Name Disaggregation of Revenue [Line Items] Disaggregation of Revenue [Line Items] Revaluation to LIFO Inventory, LIFO Reserve Unvested Nonvested [Member] Nonvested Title and Position [Axis] Title and Position [Axis] Assumed healthcare cost trend rates Defined Benefit Plan, Assumed Health Care Cost Trend Rates [Abstract] Award Timing Predetermined Award Timing Predetermined [Flag] Subsequent Event Type [Domain] Subsequent Event Type [Domain] Dividend rate for unpaid amounts Preferred Stock, Dividend Rate For Unpaid Amounts, Percentage Preferred Stock, Dividend Rate For Unpaid Amounts, Percentage Investment, Name [Axis] Investment, Name [Axis] Recognized prior service credit Defined Benefit Plan, Amortization of Prior Service Cost (Credit) Forecast Forecast [Member] LONG-TERM DEBT Long-Term Debt [Text Block] Net income attributable to common stockholders—diluted (in dollars per share) Diluted earnings per common share (in dollars per share) Earnings Per Share, Diluted Estimated future benefit payments Defined Benefit Plan, Expected Future Benefit Payment [Abstract] Environmental remediation liabilities Accrued Environmental Loss Contingencies, Noncurrent REVENUE Revenue from Contract with Customer [Policy Text Block] 2.900% senior notes due 2024 Senior Notes 2.900 Percent Due 2024 [Member] Senior Notes 2.900 Percent Due 2024 [Member] State State and Local Jurisdiction [Member] Equity method investment commitments Equity Method Investments, Commitment Equity Method Investments, Commitment Total current tax expense Current Income Tax Expense (Benefit) Restatement does not require Recovery Restatement Does Not Require Recovery [Text Block] Ownership [Axis] Ownership [Axis] Payout at vesting percentage Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Percentage Retirement Benefits [Abstract] Retirement Benefits [Abstract] Preferred stock issued (in shares) Preferred Stock, Shares Issued Statement of Financial Position [Abstract] Statement of Financial Position [Abstract] 4.400% senior notes due 2049 Senior Notes 4.400 Percent Due 2049 [Member] Senior Notes 4.400 Percent Due 2049 [Member] Unweighted arithmetic average price (per unit) Natural Gas, Proved Reserve, Property Acquisition, Unweighted Arithmetic Average Price Per Energy Natural Gas, Proved Reserve, Property Acquisition, Unweighted Arithmetic Average Price Per Energy (Increase) decrease in trade receivables Increase (Decrease) in Receivables INVESTMENTS AND RELATED-PARTY TRANSACTIONS Investments And Related Party Transactions [Text Block] Investments and Related Party Transactions [Text Block] Fair value of shares vested during the year Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value NET INCOME Net income Net income Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Gains on interest rate swaps, net Gain (Loss) on Interest Rate Swaps and Warrants, Net [Member] Gain (Loss) on Interest Rate Swaps and Warrants, Net [Member] Income tax expense Total income tax expense Income tax expense Income Tax Expense (Benefit) Interest cost on projected benefit obligation Interest cost on projected benefit obligation Defined Benefit Plan, Interest Cost Net periodic benefit costs: Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] Total fair value, asset Derivative Asset Weighted-average period over which unrecognized compensation expense is expected to be recognized Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition Net sales Revenue from customers Revenue from contracts with customers Revenue from Contract with Customer, Excluding Assessed Tax Asset impairments and other charges Pretax Asset Impairment and Related Items The pre-tax charge against earnings resulting from the write down of long lived assets due to the difference between the carrying value and lower fair value, and related items. Statement of Comprehensive Income [Abstract] Statement of Comprehensive Income [Abstract] Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] Net cash used by investing activities Net Cash Provided by (Used in) Investing Activities Environmental reserves, range between zero to $ one million site category, number of sites Environmental Reserves Range Between Zero to One Million Site Category, Number of Sites This item represents the number of sites with each site's reserves in between zero to one million. Less current maturities of long-term debt Long-term Debt, Current Maturities Excluding Finance Leases Long-term Debt, Current Maturities Excluding Finance Leases Income Tax Jurisdiction [Axis] Income Tax Jurisdiction [Axis] Business Acquisition [Line Items] Business Acquisition [Line Items] All Adjustments to Compensation All Adjustments to Compensation [Member] Payroll and related expenses Employee-related Liabilities, Current Schedule of significant equity investments Equity Method Investments [Table Text Block] Additional paid-in capital Additional Paid in Capital Short-Term Debt, Type [Domain] Short-Term Debt, Type [Domain] Other intangible assets Other Intangible Assets, Net 7.200% senior debentures due 2028 Senior Debentures 7.200 Percent Due 2028 [Member] Senior Debentures 7.200 Percent Due 2028 [Member] Derivative Instruments, Gain (Loss) [Table] Derivative Instruments, Gain (Loss) [Table] Accumulated Other Comprehensive Income (Loss) [Line Items] Accumulated Other Comprehensive Income (Loss) [Line Items] Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] Legal Entity [Axis] Legal Entity [Axis] Schedule of net sales related to the outstanding commodity derivative instruments Schedule of Derivative Instruments Included in Trading Activities [Table Text Block] Disposal Group, Disposed of by Sale, Not Discontinued Operations Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] Environmental Remediation Obligations [Abstract] Environmental Remediation Obligations [Abstract] Scenario [Domain] Scenario [Domain] Outside North America Outside Of North America [Member] Area outside of the Continent of North America. Derivatives Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member] Discontinued operations—basic (in dollars per share) Discontinued Operation, Income (Loss) from Discontinued Operation, Net of Tax, Per Basic Share Grant-date assumptions used in the Monte Carlo simulation models Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions and Methodology [Abstract] Long-term Debt, Type [Domain] Long-Term Debt, Type [Domain] Entity Address, State or Province Entity Address, State or Province Derivative Instruments and Hedging Activities Disclosure [Abstract] Derivative Instruments and Hedging Activities Disclosure [Abstract] EQUITY INVESTMENTS Schedule of Equity Method Investments [Line Items] Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] Health care cost trend rates for prior year (as a percent) Defined Benefit Plan, Health Care Cost Trend Rate Assumed Defined Benefit Plan, Health Care Cost Trend Rate Assumed Defined Benefit Plan, Plan Assets, Category [Domain] Defined Benefit Plan, Plan Assets, Category [Domain] Midstream and marketing Midstream And Marketing [Member] Represents company's midstream and marketing segment, used for segment reporting purposes. Defined Benefit Plan Disclosure Postretirement and Other Benefit Plans Disclosure Defined Benefit Plan Disclosure [Line Items] Environmental loss contingency, noncurrent, statement of financial position Environmental Loss Contingency, Noncurrent, Statement of Financial Position [Extensible Enumeration] Accrued liabilities for the supplemental retirement plan Supplemental Retirement Plan, Supplemental Retirement Plan Accrued Liabilities This element represents the accrued liabilities for supplemental retirement benefit plan which provides restoration of benefit lost due to government limitations on qualified retirement benefits. Unvested, beginning of period, weighted-average grant-date fair value (in dollars per share) Unvested, end of period, weighted-average grant-date fair value (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value LIABILITIES AND EQUITY Liabilities and Equity [Abstract] Stock options, weighted average strike price, beginning balance (in dollars per share) Stock options, weighted average strike price, ending balance (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Weighted Average Strike Price Share-based Compensation Arrangement by Share-based Payment Award, Options, Weighted Average Strike Price Schedule of components of the net periodic benefit costs Schedule of Net Benefit Costs [Table Text Block] (Increase) decrease in joint interest receivables and other current assets Increase (Decrease) In Joint Interest Receivables And Other Current Assets Increase (Decrease) In Joint Interest Receivables And Other Current Assets Restatement Determination Date Restatement Determination Date Fair Value Estimate of Fair Value Measurement [Member] Charged to Costs and Expenses SEC Schedule, 12-09, Valuation Allowances and Reserves, Additions, Charge to Cost and Expense Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Other Operating Segments And Intersegment Eliminations Other Operating Segments And Intersegment Eliminations [Member] Other Operating Segments And Intersegment Eliminations Variable rate bonds Variable Rate Bonds [Member] Variable Rate Bonds [Member] Summary of Significant Accounting Policies [Line Items] Summary of Significant Accounting Policies [Line Items] These concepts are used to disclose supplemental cash flow information. 6.625% senior notes due 2030 Senior Notes 6.625 Percent Due 2030 [Member] Senior Notes 6.625 Percent Due 2030 OPERATING LEASE ASSETS Operating lease, right-of-use Operating Lease, Right-of-Use Asset Erroneously Awarded Compensation Recovery Erroneously Awarded Compensation Recovery [Table] Derivative Instruments, Gain (Loss) [Line Items] Derivative Instruments, Gain (Loss) [Line Items] Stock options, number of shares outstanding, beginning balance (in shares) Stock options, number of shares outstanding, ending balance (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number Short-Term Debt, Type [Axis] Short-Term Debt, Type [Axis] Permian Basin Permian Basin [Member] Permian Basin Net capitalized costs attributable to unproved properties Oil and Gas, Capitalized Cost, before Accumulated Depreciation, Depletion, Amortization, and Valuation Allowance, Mineral Interest, Unproved Property Accrued Environmental Loss Contingencies, Noncurrent Accrued Environmental Loss Contingencies, Noncurrent [Member] Accrued Environmental Loss Contingencies, Noncurrent Schedule of current and non-current environmental remediation reserves by categories of sites Schedule of Environmental Loss Contingencies by Site [Table Text Block] Dividends payable Dividends Payable, Current Subsequent event Subsequent Event [Member] Options Exercised Stock Issued During Period, Value, Stock Options Exercised Restricted cash and restricted cash equivalents Restricted Cash and Cash Equivalents, Current Gains (losses) on derivatives Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, after Tax Granted, weighted-average grant-date fair value (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value INCOME TAXES Income Tax, Policy [Policy Text Block] Peer Group Issuers, Footnote Peer Group Issuers, Footnote [Text Block] 2029 Operating And Finance Lease, Liability, Payments, Due Year Five Operating And Finance Lease, Liability, Payments, Due Year Five 5.500% senior notes due 2025 Senior Notes 5.500 Percent Due 2025 [Member] Senior Notes 5.550 Percent Due 2026 [Member] Consideration upon approval Business Combination, Consideration Expected To Transfer Upon Closing Business Combination, Consideration Expected To Transfer Upon Closing 6.200% senior notes due 2040 Senior Notes 6.200 Percent Due 2040 [Member] Senior Notes 6.200 Percent Due 2040 [Member] Schedule of finance lease maturities Finance Lease, Liability, to be Paid, Maturity [Table Text Block] Segments [Domain] Segments [Domain] Unrecognized Tax Benefits [Roll Forward] Unrecognized Tax Benefits [Roll Forward] Schedule of repurchase agreements Schedule of Repurchase Agreements [Table Text Block] Zero Coupon senior notes due 2036 Zero Coupon Senior Notes Due 2036 [Member] Zero Coupon Senior Notes Due 2036 [Member] NET Power NET Power [Member] NET Power PEO PEO [Member] Variable-rate debt as a percentage of total debt Variable Rate Debt As Percentage Of Long Term Debt Gross Variable Rate Debt As Percentage Of Long Term Debt Gross Name Trading Arrangement, Individual Name Unfunded status: Defined Benefit Plan, Funded (Unfunded) Status of Plan Financing portion of net cash paid for derivative instruments Payments for (Proceeds from) Derivative Instrument, Financing Activities Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Long-Lived Tangible Asset [Axis] Long-Lived Tangible Asset [Axis] Entity Public Float Entity Public Float Disposal Group Name [Axis] Disposal Group Name [Axis] Warrants issued (in shares) Class of Warrant or Right, Issued Class of Warrant or Right, Issued Income from equity investments and other Income (Loss) from Equity Method Investments Treasury stock: 2024 — 228,311,184 shares and 2023 — 228,053,397 shares Treasury Stock, Common, Value Variable rate bonds due 2030 (5.710% and 5.750% as of December 31, 2024 and 2023, respectively) Variable Rate Bonds Due 2030 [Member] Variable Rate Bonds Due 2030 [Member] Benefit obligation — beginning of year Benefit obligation — end of year Defined Benefit Plan, Benefit Obligation Awards Close in Time to MNPI Disclosures, Table Awards Close in Time to MNPI Disclosures [Table Text Block] OTHER ITEMS Other Nonoperating Income (Expense) [Abstract] Cash dividends paid on common and preferred stock Payments of Ordinary Dividends SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract] SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract] Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year [Member] Retirement Plan Sponsor Location [Domain] Retirement Plan Sponsor Location [Domain] Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount Discontinued operations—diluted (in dollars per share) Discontinued Operation, Income (Loss) from Discontinued Operation, Net of Tax, Per Diluted Share Local Phone Number Local Phone Number Non-National Priorities List Sites Non-National Priorities List Sites [Member] Non-National Priorities List Sites Fair value of liabilities acquired: Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities [Abstract] 6.450% senior notes due 2036 Senior Notes 6.450 Percent Due 2036 [Member] Senior Notes 6.450 Percent Due 2036 [Member] 6.625% debentures due 2028 Debentures 6.625 Percent Due 2028 [Member] Debentures 6.625 Percent Due 2028 [Member] Projected benefit obligation Defined Benefit Plan, Pension Plans with Plan Assets in Excess of Accumulated Benefit Obligations Aggregate Projected Benefit Obligation If aggregate disclosures are presented, the aggregate projected benefit obligation for pension plans with plan assets in excess of accumulated benefit obligations as of the measurement date of each statement of financial position presented. Valuation allowance Deferred Tax Assets, Valuation Allowance Debt, combined amount drawn Debt, Long-Term and Short-Term, Combined Amount 5.000% senior notes due 2029 Senior Notes 5.000 Percent Due 2029 [Member] Senior Notes 5.000 Percent Due 2029 Aggregate Erroneous Compensation Not Yet Determined Aggregate Erroneous Compensation Not Yet Determined [Text Block] Tronox Settlement Tronox Settlement [Member] Tronox Settlement [Member] Equity Method Investment [Table] Equity Method Investment [Table] Schedule of financial information of equity-method investments Schedule Of Ownership Interests In Equity Investments [Table Text Block] Schedule of Ownership Interests in Equity Investments [Table Text Block] Environmental remediation expense, statement of income or comprehensive income Environmental Remediation Expense, before Recovery, Statement of Income or Comprehensive Income [Extensible Enumeration] Change in capital accrual Increase (Decrease) In Capital Accrual Increase (Decrease) In Capital Accrual Black Butte Coal Company Black Butte Coal Company [Member] Black Butte Coal Company Changes in operating assets and liabilities: Increase (Decrease) in Operating Capital [Abstract] 2027 Operating And Finance Lease, Liability, Payments, Due Year Three Operating And Finance Lease, Liability, Payments, Due Year Three Available borrowing capacity Line of Credit Facility, Increase (Decrease), Net PEO Total Compensation Amount PEO Total Compensation Amount 5.000% senior notes due 2027 5.000% senior notes due 2027 Senior Notes 5.000 Percent Due 2027 [Member] Senior Notes 5.000 Percent Due 2027 Commodity contract derivative liability, gross Derivative Liability, Subject to Master Netting Arrangement, before Offset Total shares of Occidental common stock issued (in shares) Business Acquisition, Equity Interest Issued or Issuable, Number of Shares Long-Lived Tangible Asset [Domain] Long-Lived Tangible Asset [Domain] Statement of Income Location, Balance [Axis] Statement of Income Location, Balance [Axis] Accrued interest payable Interest Payable, Current Defined Benefit Plan, Plan Assets, Category [Axis] Defined Benefit Plan, Plan Assets, Category [Axis] Debt Disclosure [Abstract] Debt Disclosure [Abstract] Other deferred credits and liabilities Deferred Credits And Other Liabilities, Noncurrent, Other Deferred Credits And Other Liabilities, Noncurrent, Other Common Stock, $0.20 par value Common Stock Common Stock [Member] Collateral received netted against derivative assets Derivative Liability, Subject to Master Netting Arrangement, Collateral, Right to Reclaim Cash Not Offset Corporate and eliminations Corporate And Eliminations [Member] Corporate And Eliminations Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Expense of Enforcement, Amount Other current assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Other Schedule of Business Acquisitions, by Acquisition [Table] Schedule of Business Acquisitions, by Acquisition [Table] Line of credit Line of Credit [Member] Environmental Remediation Site [Axis] Environmental Remediation Site [Axis] Oil Oil [Member] Segment Reporting [Abstract] Segment Reporting [Abstract] ENVIRONMENTAL LIABILITIES AND EXPENDITURES Environmental Loss Contingency Disclosure [Text Block] Pension and postretirement obligations Liability, Pension and Other Postretirement and Postemployment Benefits, Noncurrent Entity Central Index Key Entity Central Index Key Scenario [Axis] Scenario [Axis] Other segment expenses Segment Reporting, Other Segment Item, Amount Strike Price Two Strike Price Two [Member] Strike Price Two 8.875% senior notes due 2030 Senior Notes 8.875 Percent Due 2030 [Member] Senior Notes 8.875 Percent Due 2030 Changes in Right-of-Use assets Right-Of-Use Asset Obtained In Exchange For Lease Liability [Abstract] Right-Of-Use Asset Obtained In Exchange For Lease Liability Schedule of inventories Schedule of Inventory, Current [Table Text Block] Equity investments, partnerships and international subsidiaries Deferred Tax Liabilities, Equity Investments Partnerships and Foreign Subsidiaries The tax effect as of the balance sheet date of the amount of the estimated future tax reductions attributable to the difference between the tax basis and the generally accepted accounting principles basis of a company's equity method investment, partnership and foreign subsidiaries which will decrease future taxable income when such basis difference reverses. Interest and penalties associated with liabilities for unrecognized tax benefits Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued Total Operating and Finance Lease Liabilities, Payments, Due [Abstract] Operating and Finance Lease Liabilities, Payments, Due [Abstract] Foreign currency translation adjustments Accumulated Foreign Currency Adjustment Attributable to Parent [Member] Non-PEO NEO Average Compensation Actually Paid Amount Non-PEO NEO Average Compensation Actually Paid Amount STOCKHOLDERS' EQUITY Equity [Text Block] Decrease in accounts payable and accrued liabilities Increase (Decrease) in Accounts Payable and Accrued Liabilities Award Timing, How MNPI Considered Award Timing, How MNPI Considered [Text Block] INDUSTRY SEGMENTS AND GEOGRAPHIC AREAS Segment Reporting Disclosure [Text Block] Fair Value, Inputs, Level 1, 2 and 3 Fair Value, Inputs, Level 1, Level 2, and Level 3 [Member] Pension and postretirement adjustments Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent [Member] Put in whole, amount Debt Instrument, Repurchase Amount, If Put In Whole Debt Instrument, Repurchase Amount, If Put In Whole Carbon Engineering, Ltd. Carbon Engineering, Ltd. [Member] Carbon Engineering, Ltd. Stock-Settled RSUs Stock Settled Restricted Stock Unit [Member] Represents stock based awards with shares for which sale is contractually or governmentally restricted for a given period of time, which are settled in shares at the time of vesting. Deferred tax liabilities Deferred Tax Liabilities, Net [Abstract] Measurement Basis [Axis] Measurement Basis [Axis] Fair value of previously held interest Business Combination, Acquisition of Less than 100 Percent, Noncontrolling Interest, Fair Value Title Trading Arrangement, Individual Title WES Western Midstream Partners LP [Member] Western Midstream Partners LP [Member] Consolidated Entities [Axis] Consolidated Entities [Axis] Schedule of domestic and foreign components of income from continuing operations before domestic and foreign income taxes Schedule of Income before Income Tax, Domestic and Foreign [Table Text Block] Unrecognized tax benefits Balance, at beginning of period Balance, at end of period Unrecognized Tax Benefits Less: Comprehensive income attributable to noncontrolling interest Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest Position [Domain] Position [Domain] INVESTMENTS IN UNCONSOLIDATED ENTITIES Consolidation, Variable Interest Entity, Policy [Policy Text Block] City Area Code City Area Code CURRENT LIABILITIES Liabilities, Current [Abstract] Auditor Location Auditor Location OxyChem Ingleside Facility Oxychem Ingleside Facility [Member] Oxychem Ingleside Facility [Member] DEL Dolphin Energy Limited [Member] Dolphin Energy Limited [Member] Disposal Group Classification [Domain] Disposal Group Classification [Domain] Insider Trading Policies and Procedures Not Adopted Insider Trading Policies and Procedures Not Adopted [Text Block] Chemical Chemical Segment [Member] This member represents the chemical segment. Business acquisition, period (in days) Stockholders' Equity Note [Abstract] Losses (gains) on sales of assets and other, net Gain on sale of assets Gains (losses) on sales of assets and other, net Gain (Loss) on Disposition of Assets Preferred Stock Preferred Stock [Member] Available borrowing capacity Line of Credit Facility, Remaining Borrowing Capacity Purchases of treasury stock Payments for Repurchase of Common Stock RETIREMENT AND POSTRETIREMENT BENEFIT PLANS Pension and Other Postretirement Plans, Policy [Policy Text Block] Deferred foreign tax liability due to reversal of indefinite re-investment assertion Deferred Tax Liabilities, Undistributed Foreign Earnings SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Table] SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Table] Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Total Costs and expenses Costs and Other Deductions Total costs of sales, operating expenses, and nonoperating expenses for the period. One-time non-cash tax benefit as a result of a legal entity reorganization Income Tax Expense (Benefit) from Reorganization Income Tax Expense (Benefit) from Reorganization Stock awards other than options and SARs, Weighted-Average Grant-Date Fair Value (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] 7.000% debentures due 2027 Debentures 7.000 Percent Due 2027 [Member] Debentures 7.000 Percent Due 2027 [Member] Income before income taxes and other items Income (Loss) From Continuing Operations Before Nonoperating Income (Expense), Equity Method Investments, Income Taxes, Noncontrolling Interest Income (Loss) From Continuing Operations Before Nonoperating Income (Expense), Equity Method Investments, Income Taxes, Noncontrolling Interest Subsequent Event Type [Axis] Subsequent Event Type [Axis] Retained earnings Retained Earnings (Accumulated Deficit) Environmental loss contingency, statement of financial position Environmental Loss Contingency, Statement of Financial Position [Extensible Enumeration] Class of Stock [Domain] Class of Stock [Domain] Increase in inventories Increase (Decrease) in Inventories Due in two years Long-Term Debt, Maturity, Year Two Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Equity Awards Adjustments Equity Awards Adjustments [Member] Total lease liabilities Operating Lease, Liability 4.625% senior notes due 2045 Senior Notes 4.625 Percent Due 2045 [Member] Senior Notes 4.625 Percent Due 2045 [Member] Underlying Securities Award Underlying Securities Amount PREFERRED STOCK Preferred Stock, Number of Shares, Par Value and Other Disclosure [Abstract] Net Periodic Benefit Cost Assumptions: Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract] 2029 Finance Lease, Liability, to be Paid, Year Five Dividends on common stock Dividends, Common Stock, Cash Amendment Flag Amendment Flag 8.450% senior debentures due 2029 Senior Debentures 8.450 Percent Due 2029 [Member] Senior Debentures 8.450 Percent Due 2029 [Member] Trade receivables, net Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables Stock Appreciation Rights (SARs) Stock Appreciation Rights (SARs) [Member] RECEIVABLES AND OTHER CURRENT ASSETS Receivables And Other Current Assets, Policy [Policy Text Block] Receivables And Other Current Assets, Policy Potential benefit Unrecognized Tax Benefits, Potential Benefit Unrecognized Tax Benefits, Potential Benefit Amortization of right-of-use assets Finance Lease, Right-of-Use Asset, Amortization Actual return on plan assets Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss) Debt issuance costs Debt Issuance Costs, Net Number of shares sold (in shares) Sale of Stock, Number of Shares Issued in Transaction Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] 4.500% senior notes due 2044 Senior Notes 4.500 Percent Due 2044 [Member] Senior Notes 4.500 Percent Due 2044 [Member] Recovery of Erroneously Awarded Compensation Disclosure [Line Items] Debt instrument issued Debt Instrument, Face Amount Business credit carryforwards Deferred Tax Assets, Tax Credit Carryforwards, General Business Entity Address, Postal Zip Code Entity Address, Postal Zip Code Gains (losses) on sales of assets and other, net Gain (Loss) On Disposition Of Assets And Other, Net Gain (Loss) On Disposition Of Assets And Other, Net Interest Rate Swaps Interest Rate Swap [Member] Long-term Purchase Commitment [Table] Long-Term Purchase Commitment [Table] 7.125% debentures due 2027 Debentures 7.125 Percent Due 2027 [Member] Debentures 7.125 Percent Due 2027 [Member] Total benefit costs, including postretirement costs Other Postretirement Benefits Cost (Reversal of Cost) Government securities US Government Debt Securities [Member] Issuance of common stock and other, net Issuance of Common Stock and Other, Net The change in equity due to the value of new stock issued during the period (net of issuance costs), as well as the value of stock issued during the period as a result of the exercise of stock options and other equity transactions. Cash and cash equivalents Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Schedule of components of amounts recognized in the consolidated balance sheets Schedule of Amounts Recognized in Balance Sheet [Table Text Block] Voluntary redemption, percentage (in percent) Preferred Stock, Voluntary Redemption, Percentage Preferred Stock, Voluntary Redemption, Percentage Other long-term assets Other Noncurrent Assets [Member] Warrants to Purchase Common Stock, $0.20 par value Warrants to Purchase Common Stock [Member] Warrants to Purchase Common Stock Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested [Member] Other Other [Member] Other Auditor Name Auditor Name 7.150% debentures due 2028 Debentures 7.150 Percent Due 2028 [Member] Debentures 7.150 Percent Due 2028 [Member] Forfeitures, weighted-average grant-date fair value (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value Raw materials Inventory, Raw Materials, Gross Deferred payments for purchases of assets and businesses Deferred Payments For Purchases Of Assets And Businesses Deferred Payments For Purchases Of Assets And Businesses Current Current Income Tax Expense (Benefit), Continuing Operations [Abstract] Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested [Member] River stretch which may require remedial actions River Stretch Which May Require Remedial Actions Represents the stretch of river which may be covered by remedial actions. The estimated useful lives of occidental's chemical assets Property, Plant and Equipment, Useful Life Outstanding stock options Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding [Roll Forward] Fair Value Measurement [Domain] Fair Value Measurement [Domain] Equity Method Investment, Nonconsolidated Investee [Axis] Equity Method Investment, Nonconsolidated Investee [Axis] Other Defined Benefit Plan, Plan Assets, Increase (Decrease) for Other Change Defined Benefit Plan, Plan Assets, Increase (Decrease) for Other Change Adjustment To PEO Compensation, Footnote Adjustment To PEO Compensation, Footnote [Text Block] Number of equal annual payments Business Combination, Number Of Annual Payments Business Combination, Number Of Annual Payments Total property, plant and equipment, net Property, plant, and equipment Property, Plant, and Equipment and Finance Lease Right-of-Use Asset, after Accumulated Depreciation and Amortization Financing cash flows from finance leases Finance Lease, Principal Payments Equity interest in acquiree, percentage Business Combination, Step Acquisition, Equity Interest in Acquiree, Percentage Net income, net of participating securities Net Income (Loss) Available to Common Stockholders, Basic Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] Stock, Class of Stock [Table] Stock, Class of Stock [Table] Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year [Member] Projected benefit obligation Defined Benefit Plan, Pension Plan with Accumulated Benefit Obligation in Excess of Plan Assets, Projected Benefit Obligation TOTAL ASSETS Assets Total Assets Assets Chemical and midstream cost of sales Cost of sales Cost of Goods and Services Sold Asset retirement obligations Business Combination, Recognized Identifiable Asset Acquired and Liability Assumed, Asset Retirement Obligation Business Combination, Recognized Identifiable Asset Acquired and Liability Assumed, Asset Retirement Obligation Income tax receivables Income Taxes Receivable, Current Operating loss carryforward, valuation allowance Operating Loss Carryforwards, Valuation Allowance Weighted average sales price (in dollars per share) Oil and Gas, Average Sale Price Per Unit Capital expenditures Payments to Acquire Property, Plant, and Equipment Forgone Recovery due to Violation of Home Country Law, Amount Forgone Recovery due to Violation of Home Country Law, Amount Vested, Unvested Share-based Payment Awards [Domain] Vested, Unvested Share-based Payment Awards [Domain] Vested, Unvested Share-based Payment Awards STOCK-BASED INCENTIVE PLANS Share-Based Payment Arrangement [Policy Text Block] 2026 Operating And Finance Lease, Liability, Payments, Due Year Two Operating And Finance Lease, Liability, Payments, Due Year Two Schedule of reconciliation of the United States federal statutory income tax rate to Occidental's worldwide effective tax rate on income from continuing operations stated as a percentage of pre-tax income Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] Termination Date Trading Arrangement Termination Date Non-monetary exchange agreement value Noncash or Part Noncash Acquisition, Net Nonmonetary Assets Acquired (Liabilities Assumed) Fair value of assets and liabilities Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] 2026 Lessee, Operating Lease, Liability, to be Paid, Year Two Purchase obligations in year four Purchase Obligation, to be Paid, Year Four Due next year Long-Term Debt, Maturity, Year One Environmental litigation tax and other reserves, current Environmental Litigation Tax And Other Reserves, Current Environmental Litigation Tax And Other Reserves, Current Fair value of assets acquired: Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets [Abstract] Not designated as hedging instruments Not Designated as Hedging Instrument [Member] Uncertain tax positions Effective Income Tax Rate Reconciliation, Tax Contingency, Percent Acquisitions, divestitures and other, net Asset Retirement Obligation Acquisitions and Other This element represents amount of the increase (decrease) in the amount of asset retirement obligations for the period associated with acquisitions and other activity. Number of employees accruing benefits under defined benefit plans Defined Benefit Plan, Number of Participating Employees This element represents the number of employees currently accruing benefits under defined benefit plans. Schedule of preliminary purchase price Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block] Debt Instrument [Axis] Debt Instrument [Axis] Less: Preferred stock dividends and redemption premiums Less: Preferred stock dividends Preferred Stock Dividends and Other Adjustments Net Income (Loss) Net Income (Loss) Attributable to Parent Trading Arrangement: Trading Arrangement [Axis] 3.450% senior notes due 2024 Senior Notes 3.450 Percent Due 2024 [Member] Senior Notes 3.450 Percent Due 2024 [Member] 2030 - 2034 Defined Benefit Plan, Expected Future Benefit Payment, after Year Five for Next Five Years Pay vs Performance Disclosure, Table Pay vs Performance [Table Text Block] Schedule of fair values of cccidental's pension plan assets by asset category Schedule of Allocation of Plan Assets [Table Text Block] Equity Awards Adjustments, Excluding Value Reported in Compensation Table Equity Awards Adjustments, Excluding Value Reported in the Compensation Table [Member] Entity File Number Entity File Number Schedule of weighted-average assumptions used to determine Occidental's benefit obligation and net periodic benefit cost for domestic plans Defined Benefit Plan, Assumptions [Table Text Block] Balance — beginning of year Balance — end of year Oil and Gas, Capitalized Exploratory Well Cost Consolidated Entities [Domain] Consolidated Entities [Domain] Noncontrolling Interests Noncontrolling Interest [Member] Income Statement [Abstract] Income Statement [Abstract] Entity Address, Address Line One Entity Address, Address Line One Foreign Income (Loss) from Continuing Operations before Income Taxes after Income (Loss) from Equity Method Investments Foreign This element represents the income or loss from continuing operations before income taxes, and after income or loss from equity method investments that is attributable to foreign operations. Federal Current Federal Tax Expense (Benefit) Entity Address, Address Line Two Entity Address, Address Line Two Number of shares counted for each share covered by an award in determining the number of shares that are available for future awards (in shares) Stock Issued During Period Number of Shares Counted Against Issued Share Based Compensation Number of shares counted for each share covered by an award (other than Options and SARs) in determining the number of shares that are available for future awards. Total lease payments Operating And Finance Lease, Liability, Payments, Due Operating And Finance Lease, Liability, Payments, Due Benefits related to tax positions which ultimate deductibility is highly certain Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit Name Forgone Recovery, Individual Name Weighted average lease term, operating lease Operating Lease, Weighted Average Remaining Lease Term Payment of receivables securitization facility Repayments of Accounts Receivable Securitization REVENUES AND OTHER INCOME Revenues and Other Income [Abstract] Accumulated benefit obligation Defined Benefit Plan, Pension Plans with Plan Assets in Excess of Accumulated Benefit Obligations Aggregate Accumulated Benefit Obligation If aggregate disclosures are presented, the aggregate pension accumulated benefit obligation for pension plans with plan assets in excess of accumulated benefit obligations as of the measurement date of each statement of financial position presented. Purchase obligations in year five Purchase Obligation, to be Paid, Year Five Other noncash charges (benefit) to income Other Noncash Income (Expense) Award Timing MNPI Considered Award Timing MNPI Considered [Flag] Schedule of estimated future benefit payments, which reflect expected future service, as appropriate Schedule of Expected Benefit Payments [Table Text Block] Net loss attributable to common stockholders per share—basic (in dollars per share) Business Acquisition, Pro Forma Earnings Per Share, Basic 7.500% debentures due 2026 Debentures 7.500 Percent Due 2026 [Member] Debentures 7.500 Percent Due 2026 [Member] Reductions for tax positions of prior years Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions Inventory Disclosure [Abstract] Inventory Disclosure [Abstract] Outstanding Aggregate Erroneous Compensation Amount Outstanding Aggregate Erroneous Compensation Amount Berkshire Hathaway Berkshire Hathaway [Member] Berkshire Hathaway PEO Actually Paid Compensation Amount PEO Actually Paid Compensation Amount Disposed of by sale Discontinued Operations, Disposed of by Sale [Member] Income from continuing operations—diluted (in dollars per share) Income (Loss) from Continuing Operations, Per Diluted Share Vested, Unvested Share-based Payment Awards [Axis] Vested, Unvested Share-based Payment Awards [Axis] Vested, Unvested Share-based Payment Awards Adjustment to Compensation: Adjustment to Compensation [Axis] Less: Net income attributable to noncontrolling interest Net Income (Loss) Attributable to Noncontrolling Interest Other Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, after Tax Oil and gas lease operating expense Oil and Gas, Result of Operation, Expense Option indexed to issuer's equity, strike price (in dollars per share) Option Indexed to Issuer's Equity, Strike Price Litigation Case [Domain] Litigation Case [Domain] Accumulated other comprehensive income Accumulated Other Comprehensive Income (Loss), Net of Tax Pension Adjustments Service Cost Pension Adjustments Service Cost [Member] Site Contingency [Table] Site Contingency [Table] Number of shares awarded to date (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Awarded The number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), awarded under the equity-based compensation plan at reporting date. Weighted-average number of basic shares (in shares) Weighted Average Number of Shares Outstanding, Basic Related Party [Axis] Related and Nonrelated Parties [Axis] Stock Price or TSR Estimation Method Stock Price or TSR Estimation Method [Text Block] 5.375% senior notes due 2032 5.375% senior notes due 2032 Senior Notes 5.375 Percent Due 2032 [Member] Senior Notes 5.375 Percent Due 2032 Total equity Beginning balance Ending balance Total equity Equity, Including Portion Attributable to Noncontrolling Interest Property, plant and equipment Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment Debt assumptions related to CrownRock Repayments of Assumed Debt Name Awards Close in Time to MNPI Disclosures, Individual Name Additional cash benefits realized from utilization of tax attributes from deduction of legal settlement Additional Cash Tax Benefits Realized From Utilization Of Tax Attributes From Deduction Of Legal Settlement Additional Cash Tax Benefits Realized From Utilization Of Tax Attributes From Deduction Of Legal Settlement Number of site categories Environmental Remediation Contingency, Number Of Site Categories Environmental Remediation Contingency, Number Of Site Categories Entity Filer Category Entity Filer Category Diamond Alkali Superfund Site Diamond Alkali Superfund Site [Member] Diamond Alkali Superfund Site Liabilities settled and paid Asset Retirement Obligation, Liabilities Settled Amounts drawn under the facility Proceeds from Long-Term Lines of Credit COSTS AND OTHER DEDUCTIONS Costs and Other Deductions [Abstract] Statistical Measurement [Domain] Statistical Measurement [Domain] PP&E Additions Segment, Expenditure, Addition to Long-Lived Assets Schedule of lease costs Lease, Cost [Table Text Block] PROPERTY, PLANT AND EQUIPMENT Property, Plant, and Equipment and Finance Lease Right-of-Use Asset, after Accumulated Depreciation and Amortization [Abstract] Gross and net fair values of outstanding derivatives (in millions) Derivatives, Fair Value [Line Items] Non-core proved and unproved properties sold Proceeds from Sale of Oil and Gas Property and Equipment Non-employee directors Director [Member] Other Other Liabilities, Current Potential benefit, if recognized, would affect the effective tax rate on income Unrecognized Tax Benefits that Would Impact Effective Tax Rate Segment Information Segment Reporting Information [Line Items] Revisions to previous estimates Asset Retirement Obligation, Revision of Estimate Joint interest receivables Oil and Gas, Joint Interest Billing, Receivable All Trading Arrangements All Trading Arrangements [Member] Compensation Actually Paid vs. Net Income Compensation Actually Paid vs. Net Income [Text Block] Calculation of basic and diluted EPS Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Award vesting period Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period VIE's Variable Interest Entity, Primary Beneficiary [Member] Tax credit carryforwards Tax Credit Carryforward, Amount Rule 10b5-1 Arrangement Adopted Rule 10b5-1 Arrangement Adopted [Flag] 3.000% senior notes due 2027 Senior Notes 3.000 Percent Due 2027 [Member] Senior Notes 3.000 Percent Due 2027 [Member] Awards Close in Time to MNPI Disclosures Awards Close in Time to MNPI Disclosures [Table] Outstanding commodity derivatives contracts not designated as hedging instruments Derivative [Line Items] Valuation and qualifying accounts SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] Income taxes paid Income Taxes Paid, Net INVESTMENTS IN UNCONSOLIDATED ENTITIES Equity method investment amounts Equity Method Investments Pay vs Performance Disclosure [Line Items] Peer Group Total Shareholder Return Amount Peer Group Total Shareholder Return Amount Excess of investments in equity investees over the underlying equity in net assets, which represents goodwill Equity Method Investment Difference Between Carrying Amount And Underlying Equity Related To Goodwill Equity Method Investment Difference Between Carrying Amount And Underlying Equity Related To Goodwill Diamond Alkali Superfund Site - Operable Unit Four Diamond Alkali Superfund Site - Operable Unit Four [Member] Diamond Alkali Superfund Site - Operable Unit Four Derivative [Table] Derivative [Table] Income Tax Contingency [Table] Income Tax Contingency [Table] Deferred Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract] Schedule of gross and net fair values of outstanding derivatives Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block] Other Performance Measure, Amount Other Performance Measure, Amount Rate of increase in compensation levels Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Rate of Compensation Increase Common stock, outstanding (in shares) Common Stock, Shares, Outstanding LEASE COMMITMENTS Lessee, Operating Leases [Text Block] Receivables securitization facility Receivables Securitization Facility [Member] Receivables Securitization Facility Documents Incorporated by Reference Documents Incorporated by Reference [Text Block] Other long-term assets Long Term Receivables And Other Assets Net [Member] Line item in the statement of financial position in which the fair value amounts of the derivative instruments are included. Operating lease cost Operating Lease, Cost Class of Warrant or Right [Axis] Class of Warrant or Right [Axis] Maximum shares available for future issuance (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant Operating lease liabilities Operating Lease, Liability, Noncurrent Benefits paid Defined Benefit Plan, Benefit Obligation, Benefits Paid 6.600% senior notes due 2046 Senior Notes 6.600 Percent Due 2046 [Member] Senior Notes 6.600 Percent Due 2046 [Member] 2028 Operating And Finance Lease, Liability, Payments, Due Year Four Operating And Finance Lease, Liability, Payments, Due Year Four Non-current assets Assets, Noncurrent Other Product and Service, Other [Member] Interest on lease liabilities Finance Lease, Interest Expense Exercise of Warrants and Options (in shares) Warrants And Stock Options, Exercises In Period Warrants And Stock Options, Exercises In Period Environmental remediation additional loss range Environmental Remediation Possible Additional Loss Beyond Accruals This element represents the reasonably possible additional loss that may be incurred beyond the recorded liabilities for environmental remediation. Unweighted arithmetic average price Oil and Gas, Proved Reserve, Property Acquisition, Unweighted Arithmetic Average Price, Per Unit Oil and Gas, Proved Reserve, Property Acquisition, Unweighted Arithmetic Average Price, Per Unit Total deferred credits and other liabilities Deferred credits and other liabilities Other non-current liabilities Deferred Credits and Other Liabilities, Noncurrent Service cost — benefits earned during the period Service cost — benefits earned during the period Defined Benefit Plan, Service Cost Liquidation preference (in dollars per share) Preferred Stock, Liquidation Preference Per Share Entity Tax Identification Number Entity Tax Identification Number Impairment of equity method investment Equity Method Investment, Other-than-Temporary Impairment Equity securities Defined Benefit Plan, Equity Securities [Member] Schedule of long-term debt Schedule of Long-Term Debt Instruments [Table Text Block] Treasury Stock Purchases (in shares) Treasury Stock, Shares, Acquired Increases related to prior-year positions Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions Asset retirement obligation Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] Capitalized exploratory well costs charged to expense Oil and Gas, Capitalized Exploratory Well Cost, Charged to Expense Collateral paid netted against derivative liabilities Derivative Liability, Subject to Master Netting Arrangement, Collateral, Right to Reclaim Cash Offset Purchase obligations in year six and thereafter Purchase Obligation, Due In Sixth Year And Thereafter Purchase Obligation, Due In Sixth Year And Thereafter Retirement Plan Type [Axis] Retirement Plan Type [Axis] Foreign Deferred Foreign Income Tax Expense (Benefit) 3.500% senior notes due 2029 Senior Notes 3.500 Percent Due 2029 [Member] Senior Notes 3.500 Percent Due 2029 [Member] Rate of increase in compensation levels Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Rate of Compensation Increase 3.200% senior notes due 2026 Senior Notes 3.200 Percent Due 2026 [Member] Senior Notes 3.200 Percent Due 2026 [Member] Dry hole expense Impairment, Oil and Gas, Property with Unproved Reserve Pension and postretirement gains (losses), tax expenses Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, Tax Other Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Other Change Sale of stock, consideration received on transaction Sale of Stock, Consideration Received on Transaction Treasury Stock Treasury Stock, Common [Member] Deferred tax assets Deferred Tax Assets, Net [Abstract] Eliminations Intersegment Eliminations [Member] Other operating and non-operating expense Other Cost and Expense, Operating Asset retirement obligations Asset Retirement Obligations, Noncurrent Thereafter Finance Lease, Liability, to be Paid, after Year Five Equity Components [Axis] Equity Components [Axis] Total lease payments Finance Lease, Liability, to be Paid Other current assets Other Assets, Current Remediation costs, period Site Contingency, Disbursement Period, Estimate, Accrued Fair value of plan assets Defined Benefit Plan, Pension Plans with Plan Assets in Excess of Accumulated Benefit Obligations Aggregate Fair Value of Plan Assets If aggregate disclosures are presented, the aggregate fair value of plan assets for pension plans with plan assets in excess of accumulated benefit obligations as of the measurement date of each statement of financial position presented. Prior service credit Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), after Tax Net income attributable to common stockholders Business Acquisition, Pro Forma Net Income (Loss) Total Revenues and other income Revenues, Operating and Nonoperating The sum of operating revenues and nonoperating revenues. Operating revenues are the aggregate revenue recognized during the period derived from goods sold, services rendered, or other activities that constitute an entity's earning process. Nonoperating revenues are the aggregate revenue recognized during the period derived from ancillary business-related activities that are not considered part of the normal operations of the business. 0.000% loan due 2039 (CAD denominated) 0.000 Percent Loan Due 2039 [Member] 0.000 Percent Loan Due 2039 Less: Discount Operating And Finance Lease, Liability, Undiscounted Excess Amount Operating And Finance Lease, Liability, Undiscounted Excess Amount Business Acquisition, Acquiree [Domain] Business Acquisition, Acquiree [Domain] NET INCOME ATTRIBUTABLE TO COMMON STOCKHOLDERS Net Income (Loss) Attributable to Common Stockholders Net Income (Loss) Attributable to Common Stockholders 7.250% debentures due 2096 Debentures 7.250 Percent Due 2096 [Member] Debentures 7.250 Percent Due 2096 [Member] Stock portion of purchase price Business Combination, Consideration Transferred, Equity Interests Issued and Issuable PER COMMON SHARE, DILUTED Earnings Per Share, Diluted [Abstract] Discontinued operations, net Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax Geographical [Axis] Geographical [Axis] 2029 Lessee, Operating Lease, Liability, to be Paid, Year Five Loss on disposition of business Gain (Loss) on Disposition of Business Pre-closing dividends declared by Occidental Payments To Acquire Businesses, Gross, Dividends Declared Adjustment Payments To Acquire Businesses, Gross, Dividends Declared Adjustment Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table [Member] 4.300% senior notes due 2039 Senior Notes 4.300 Percent Due 2039 [Member] Senior Notes 4.300 Percent Due 2039 [Member] 4.400% senior notes due 2046 Senior Notes 4.400 Percent Due 2046 [Member] Senior Notes 4.400 Percent Due 2046 [Member] Lessee, Lease, Description [Line Items] Lessee, Lease, Description [Line Items] Long term tax liabilities Accrued Income Taxes, Noncurrent Accrued interest on potential income tax expense Loss Contingency, Potential Income Tax Expense (Benefit), Accrued Interest Loss Contingency, Potential Income Tax Expense (Benefit), Accrued Interest Environmental Remediation Site [Domain] Environmental Remediation Site [Domain] Cash, cash equivalents, restricted cash and restricted cash equivalents — beginning of year Cash, cash equivalents, restricted cash and restricted cash equivalents — end of year Cash, cash equivalents, restricted cash and restricted cash equivalents Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents Unrecognized compensation expense Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount Foreign Current Foreign Tax Expense (Benefit) Marketing derivatives Marketing Derivatives Marketing Derivatives [Member] Marketing Derivatives [Member] Deferred credits and other liabilities - other Deferred Credits And Other Liabilities [Member] Line item in the statement of financial position in which the fair value amounts of the derivative instruments are included. CURRENT ASSETS Assets, Current [Abstract] Consolidation Items [Axis] Consolidation Items [Axis] Strike Price One Strike Price One [Member] Strike Price One Gas Natural Gas [Member] Treasury stock, shares (in shares) Treasury Stock, Common, Shares Forgone Recovery due to Disqualification of Tax Benefits, Amount Forgone Recovery due to Disqualification of Tax Benefits, Amount Federal alternative minimum tax non-current receivables Income Taxes Receivable, Noncurrent Schedule of the activity of capitalized exploratory well costs for continuing operations Oil and Gas, Capitalized Exploratory Well Cost, Roll Forward [Table Text Block] Product and Service [Domain] Product and Service [Domain] Short-term lease cost Short-Term Lease, Cost Allowance for doubtful accounts SEC Schedule, 12-09, Allowance, Credit Loss [Member] Alden Leeds Alden Leeds [Member] Alden Leeds Vested, weighted-average grant-date fair value (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value Fair Value Disclosures [Abstract] Fair Value Disclosures [Abstract] Options, weighted average strike price Share-based Compensation Arrangement by Share-based Payment Award, Options, Weighted Average Strike Price [Roll Forward] Share-based Compensation Arrangement by Share-based Payment Award, Options, Weighted Average Strike Price Environmental reserves, range between zero to $ one million site category Environmental Reserves Range Between Zero to One Million Threshold Value Site Category This item represents the reserve, in which a site's reserve must range between zero and one million. Preferred stock, shares outstanding (in shares) Preferred Stock, Shares Outstanding Limited partner interest Limited Liability Company (LLC) or Limited Partnership (LP), Limited Partner Unit, Ownership Interest Limited Liability Company (LLC) or Limited Partnership (LP), Limited Partner Unit, Ownership Interest Warrant Warrant [Member] Security Exchange Name Security Exchange Name Oil and gas, proved reserve, period Oil And Gas, Proved Reserve, Property Acquisition, Period Oil And Gas, Proved Reserve, Property Acquisition, Period Schedule of the changes of awards Schedule of Share Based Compensation Unvested Awards [Table Text Block] Tabular disclosure of the changes in number of outstanding unvested share-equivalent awards and thee related weighted-average grant-date fair value of the entity's stock fair value. Crownrock L.P. Crownrock L.P. [Member] Crownrock L.P. Potential income tax expense Loss Contingency, Potential Income Tax Expense (Benefit) Loss Contingency, Potential Income Tax Expense (Benefit) Vested Vested [Member] Vested Roll-forward of stock awards other than options and SARS. Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] State and local Current State and Local Tax Expense (Benefit) Excess of investments in equity investees over the underlying equity in net assets Equity Method Investment, Difference Between Carrying Amount and Underlying Equity Valuation allowance and reserves, current Valuation Allowances and Reserves Current Total of allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs, which are classified as current. Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Option and SAR transactions Share Based Compensation Arrangement By Share Based Payment Award Options And S A R S [Member] An arrangement whereby an employee is entitled to receive in the future, subject to vesting and other restrictions, a number of stock options and share appreciation rights in the entity at a specified price. Right-of-use assets obtained in exchange for new finance lease liabilities Right-of-Use Asset Obtained in Exchange for Finance Lease Liability Number of operating units Site Contingency, Number Of Operating Units Site Contingency, Number Of Operating Units Redemption of preferred stock Payments for Repurchase of Redeemable Preferred Stock Common stock, issued shares (in shares) Common Stock, Shares, Issued Retirement Plan Name [Domain] Retirement Plan Name [Domain] Increase (decrease) in current domestic and foreign income taxes Increase (Decrease) in Income Taxes Payable Entity [Domain] Entity [Domain] Maximum borrowing capacity Line of Credit Facility, Maximum Borrowing Capacity Foreign tax credit carryforwards Deferred Tax Assets, Tax Credit Carryforwards, Foreign Total fair value, liability Derivative Liability Accrued liabilities - non-current Accounts Payable and Accrued Liabilities, Noncurrent Insider Trading Policies and Procedures Adopted Insider Trading Policies and Procedures Adopted [Flag] Common stock, authorized shares (in shares) Common Stock, Shares Authorized Accumulated Benefit Obligation in Excess of Plan Assets Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets [Abstract] 5.550% senior notes due 2026 Senior Notes 5.550 Percent Due 2026 [Member] Senior Notes 5.550 Percent Due 2026 Other comprehensive income (loss) items: Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent [Abstract] Environmental reserves, exceeding $ ten million, threshold value Environmental Reserves Exceeding Ten Million Threshold Value, Site Category This item represents the amount which a site's reserve must exceed, which is ten million. Long-term Debt, Type [Axis] Long-Term Debt, Type [Axis] Schedule of supplemental cash flow information Schedule of Cash Flow, Supplemental Disclosures [Table Text Block] Entity Voluntary Filers Entity Voluntary Filers Related Party Related Party [Member] Recognized actuarial loss (gain) Defined Benefit Plan, Amortization of Gain (Loss) Statement of Financial Position Location, Balance [Axis] Statement of Financial Position Location, Balance [Axis] Hedging Designation [Domain] Hedging Designation [Domain] Deferred income tax provision (benefit) Total deferred tax (expense) benefit Deferred Income Tax Expense (Benefit) Discount rate Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate Gain (loss) due to settlement Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement Schedule of pro forma financial information Business Acquisition, Pro Forma Information [Table Text Block] Other comprehensive income (loss), net of tax Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Income Tax Contingency [Line Items] Income Tax Contingency [Line Items] Liabilities acquired Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Other Liabilities Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Other Liabilities Trade receivables, net of reserves of $24 in 2024 and $29 in 2023 Trade receivables, net Advances and amounts due from related parties Accounts Receivable, after Allowance for Credit Loss, Current Granted (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross Proceeds from long-term debt, net Proceeds From Long-Term Debt, Net Of Issuance Costs Proceeds From Long-Term Debt, Net Of Issuance Costs Impairment and related charges Asset Impairment Charges Net book value of debt Long-Term Debt Gains (losses) on derivatives, tax expense Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, Tax Pension Adjustments Prior Service Cost Pension Adjustments Prior Service Cost [Member] Fair value of plan assets Defined Benefit Plan, Plan Assets, Amount NPL Sites N P L Sites [Member] This element indicates sites listed or proposed for listing by the U.S. Environmental Protection Agency on the CERCLA National Priorities List (NPL). Due in five years and thereafter Long-term Debt, Maturity, Year Five And After Long-term Debt, Maturity, Year Five And After Equity investments and other, net Payments For (Proceeds From) Equity Investments And Other, Net Payments For (Proceeds From) Equity Investments And Other, Net Gains on interest rate swaps, net Gains on interest rate swaps, net Gain (Loss) on Derivative Instruments, Net, Pretax Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block] Total Shareholder Return Vs Peer Group Total Shareholder Return Vs Peer Group [Text Block] Investments in unconsolidated entities Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures Document Annual Report Document Annual Report 2027 Finance Lease, Liability, to be Paid, Year Three 6.375% senior notes due 2028 Senior Notes 6.375 Percent Due 2028 [Member] Senior Notes 6.375 Percent Due 2028 Vested (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period Clean up costs percentage Environmental Exit Costs, Clean Up Costs Percentage Environmental Exit Costs, Clean Up Costs Percentage Closed or Non-operated Sites Closed Or Non Operated Entity Sites [Member] This element indicates sites not listed or proposed for listing by the U.S. Environmental Protection Agency on the CERCLA National Priorities List (NPL), which have been closed or are not otherwise currently operated by the entity. 7.500% debentures due 2096 Debentures 7.500 Percent Due 2096 [Member] Debentures 7.500 Percent Due 2096 [Member] Risk-free interest rate Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Risk Free Interest Rate Equity Method Investments Equity Method Investments [Abstract] Equity Method Investments [Abstract] Valuation and qualifying accounts SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] International Non-US [Member] Natural gas, period Natural Gas, Proved Reserve, Property Acquisition, Period Natural Gas, Proved Reserve, Property Acquisition, Period Accounting Policies [Abstract] Accounting Policies [Abstract] LOSS CONTINGENCIES Commitments and Contingencies, Policy [Policy Text Block] Minimum period of investigations and cleanup for CERCLA sites Estimated Period Often Taken for Investigations and Cleanup Measures for Comprehensive Environmental Response Compensation and Liability Act National Priorities List Sites, Greater than Minimum period of investigation and cleanup for Comprehensive Environmental Response Compensation and Liability Act (CERCLA) National Priorities List (NPL) sites. FAIR VALUE MEASUREMENTS Fair Value Measurement, Policy [Policy Text Block] Current Fiscal Year End Date Current Fiscal Year End Date Balance at Beginning of Period Balance at End of Period SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount Less: Discount Lessee, Operating Lease, Liability, Undiscounted Excess Amount PEO Name PEO Name Outstanding warrants (in shares) Class of Warrant or Right, Outstanding Other (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Shares Issued in Period Award Type [Domain] Award Type [Domain] 4.200% senior notes due 2048 Senior Notes 4.200 Percent Due 2048 [Member] Senior Notes 4.200 Percent Due 2048 [Member] Number of sites Environmental Remediation Sites Number Represents the number of remediation sites of the entity, as aggregated by type of environmental remediation site. Cash and cash equivalents Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents Oil commodity contracts Crude Oil and Natural Gas Liquids (NGL) [Member] Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Deferred credits and other liabilities — pension and postretirement obligations Liability, Defined Benefit Plan, Noncurrent Non-PEO NEO Non-PEO NEO [Member] Amount attributable to assets acquired Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets Additional Paid-in Capital Additional Paid-in Capital [Member] Long-term finance leases Finance Lease, Liability, Noncurrent Chemical Chemical [Member] Represents company's chemical segment, used for segment reporting purposes. RETIREMENT AND POSTRETIREMENT BENEFIT PLANS Retirement Benefits [Text Block] Class of Stock [Line Items] Class of Stock [Line Items] Deferred tax liability Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities RECENT ACCOUNTING PRONOUNCEMENTS New Accounting Pronouncements, Policy [Policy Text Block] Series A preferred stock Series A Preferred Stock [Member] Other Other Equity Investments [Member] Other Equity Investments [Member] Class of Stock [Axis] Class of Stock [Axis] Title and Position [Domain] Title and Position [Domain] 2028 Finance Lease, Liability, to be Paid, Year Four Non-voting limited partner interest Limited Liability Company (LLC) or Limited Partnership (LP), Non-Voting Limited Partner Unit Interest, Percentage Limited Liability Company (LLC) or Limited Partnership (LP), Non-Voting Limited Partner Unit Interest, Percentage Name Measure Name Entity Interactive Data Current Entity Interactive Data Current Percent of reserve to be funded over the next three to four years Percent Of Environmental Reserves To Be Funded In Three To Four Years Percent of environmental reserves to be funded by the entity in the next three to four years. New Debt New Debt [Member] New Debt Operating Activities [Axis] Operating Activities [Axis] Number of operating segments Number of Operating Segments Total fair value of assets acquired Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets Acquired Including Goodwill Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets Acquired Including Goodwill Schedule of grant-date assumptions used in the monte carlo simulation models for the estimated payout level of TSRIs Schedule of Fair Value Assumptions for Shared Based Compensation, Performance Based Awards [Table Text Block] Disclosure of significant grant date assumptions used to estimate the fair value of performance based stock awards including grant date stock price, risk-free interest rate, dividend yield, volatility and expected life. Pathway and Emerging Low Carbon Opportunities Pathway And Emerging Low Carbon Opportunities [Member] Pathway And Emerging Low Carbon Opportunities Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] Increase in environmental remediation liability Other Increase (Decrease) in Environmental Liabilities Investments measured at net asset value Fair Value Measured at Net Asset Value Per Share [Member] Total deferred tax assets, after valuation allowances Net long-term deferred tax assets Deferred Tax Assets, Net of Valuation Allowance Fair value of plan assets — beginning of year Fair value of plan assets — end of year Defined Benefit Plan, Plan Assets, Amount Excluding Net Payables Defined Benefit Plan, Plan Assets, Amount Excluding Net Payables Purchase obligations in year three Purchase Obligation, to be Paid, Year Three Preferred stock redemption – face value Stock Redeemed or Called During Period, Value Preferred stock redemption – premium Preferred Stock Redemption Premium Netting, liability Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset Debt instrument interest rate stated percentage Debt Instrument, Interest Rate, Stated Percentage Corporate Segment Reporting, Reconciling Item, Corporate Nonsegment [Member] Shareholder warrants exercised Adjustments to Additional Paid in Capital, Warrant Issued Net income, net of participating securities Net Income (Loss) Available to Common Stockholders, Diluted Total acquisition consideration Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Less Noncontrolling Interest Settlements Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities Schedule of gains and losses on derivatives Derivative Instruments, Gain (Loss) [Table Text Block] Total Nonoperating Income (Expense) Dividend rate Preferred Stock, Dividend Rate, Percentage SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS SEC Schedule, 12-09, Schedule of Valuation and Qualifying Accounts Disclosure [Text Block] 3.500% senior notes due 2025 Senior Notes 3.500 Percent Due 2025 [Member] Senior Notes 3.500 Percent Due 2025 [Member] Auditor Firm ID Auditor Firm ID Worldwide effective tax rate Worldwide effective tax rate Effective Income Tax Rate Reconciliation, Percent Net (gain) loss Accumulated Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), after Tax Number of reportable segments Number of Reportable Segments TOTAL LIABILITIES AND EQUITY Liabilities and Equity Closing Adjustments Business Combination, Closing Adjustments [Abstract] Business Combination, Closing Adjustments Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Hedging Designation [Axis] Hedging Designation [Axis] DERIVATIVES Derivative Instruments and Hedging Activities Disclosure [Text Block] 2026 Finance Lease, Liability, to be Paid, Year Two Drilling Rigs Drilling Rigs [Member] Drilling Rigs [Member] Income from discontinued operations, net of tax Income from discontinued operations, net of tax Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest Current maturities of long-term debt Long-Term Debt and Lease Obligation, Current UAE UNITED ARAB EMIRATES SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Organization, Consolidation, Basis of Presentation, Business Description and Accounting Policies [Text Block] Right-of-use assets obtained in exchange for new operating lease liabilities Right-of-Use Asset Obtained in Exchange for Operating Lease Liability Underlying Security Market Price Change Underlying Security Market Price Change, Percent Expected return on plan assets Defined Benefit Plan, Expected Return (Loss) on Plan Assets Individual: Individual [Axis] Current asset retirement obligations Asset Retirement Obligation, Current Accumulated Other Comprehensive Income (Loss) AOCI Attributable to Parent [Member] Expected life, years Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Term Inventories Total Inventory, Net Additions to capitalized exploratory well costs pending the determination of proved reserves Oil and Gas, Capitalized Exploratory Well Cost, Addition Pending Determination of Proved Reserve Product and Service [Axis] Product and Service [Axis] Statement [Line Items] Statement [Line Items] Schedule of related-party transactions Schedule of Related Party Transactions [Table Text Block] Schedule of reconciliation of operating profit (loss) from segments to consolidated Reconciliation of Operating Profit (Loss) from Segments to Consolidated [Table Text Block] Fair value of net assets acquired: Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net Benefits paid Defined Benefit Plan, Plan Assets, Benefits Paid Compensation Actually Paid vs. Total Shareholder Return Compensation Actually Paid vs. Total Shareholder Return [Text Block] Net purchase price Total purchase price Business Combination, Consideration Transferred Gain on non-monetary exchange transactions Nonmonetary Transaction, Gain (Loss) Recognized on Transfer Sales to related party (as a percent) Percentage of Sales Total Related Party Sales Percentage of Sales Total Related Party Sales Additional deferred tax liability amount required Deferred Tax Liabilities, Undistributed Foreign Earnings, Additional Amount Required Deferred Tax Liabilities, Undistributed Foreign Earnings, Additional Amount Required DERIVATIVE INSTRUMENTS Derivatives, Policy [Policy Text Block] Low end of range Minimum Minimum [Member] Adoption Date Trading Arrangement Adoption Date RELATED-PARTY TRANSACTIONS Related Party Transactions [Abstract] 7.950% debentures due 2029 Debentures 7.950 Percent Due 2029 [Member] Debentures 7.950 Percent Due 2029 [Member] Outstanding net volumes on derivatives not designated as hedges (mmbls/bcf) Derivative, Nonmonetary Notional Amount, Volume Schedule of projected benefit obligation, accumulated benefit obligation and fair value of plan assets for defined benefit pension plans with an accumulated benefit obligation in excess of plan assets and plan assets in excess of the accumulated benefit obligation Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets [Table Text Block] Segments [Axis] Segments [Axis] Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year [Member] Revenues Business Acquisition, Pro Forma Revenue Schedule of stock options Disclosure of Share-Based Compensation Arrangements by Share-Based Payment Award [Table Text Block] U.S. federal statutory tax rate Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent Derivative Instrument [Axis] Derivative Instrument [Axis] Asset retirement obligations Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Asset Retirement Obligations Long-term debt, gross Long-Term Debt, Gross Exercise Price Award Exercise Price Capitalized exploratory well costs for continuing operations Oil and Gas, Capitalized Exploratory Well Cost [Roll Forward] Weighted average cost capital percentage Oil and Gas, Proved Reserve, Weighted Average Cost Capital, Percentage Oil and Gas, Proved Reserve, Weighted Average Cost Capital, Percentage Schedule of tax effects of temporary differences resulting in deferred income taxes Schedule of Deferred Tax Assets and Liabilities [Table Text Block] Projected annual rates of healthcare cost trend rates, next fiscal year (as a percent) Defined Benefit Plan, Health Care Cost Trend Rate Assumed, Next Fiscal Year Arrangement Duration Trading Arrangement Duration Legal entity reorganization Effective Income Tax Rate Reconciliation, Nondeductible Expense, Restructuring Charges, Percent Operating loss carryforwards Operating Loss Carryforwards LEASE COMMITMENTS Lessee, Finance Leases [Text Block] Income from continuing operations—basic (in dollars per share) Income (Loss) from Continuing Operations, Per Basic Share Domestic Income (Loss) from Continuing Operations before Income Taxes after Income (Loss) from Equity Method Investments Domestic This element represents the income or loss from continuing operations before income taxes, and after income or loss from equity method investments that is attributable to domestic operations. EQUITY Equity, Attributable to Parent [Abstract] Federal Domestic Tax Jurisdiction [Member] Natural gas prices (in dollars per MCF) Natural Gas, Proved Reserve, Property Acquisition Per Energy Natural Gas, Proved Reserve, Property Acquisition Per Energy Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] Debt instrument, term (in years) Debt term Debt Instrument, Term Purchase obligations Purchase Obligation, Fiscal Year Maturity [Abstract] MAPD Medicare Advantage Plan [Member] Medicare Advantage Plan [Member] Total lease liabilities Finance Lease, Liability All Individuals All Individuals [Member] Unsecured Senior Notes Unsecured Senior Notes [Member] Unsecured Senior Notes Income Tax Disclosure [Abstract] Income Tax Disclosure [Abstract] Entities [Table] Entities [Table] 3.400% senior notes due 2026 Senior Notes 3.400 Percent Due 2026 [Member] Senior Notes 3.400 Percent Due 2026 [Member] Postretirement Benefits Other Postretirement Benefits Plan [Member] Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Algeria ALGERIA Dividends on preferred stock (in dollars per share) Preferred Stock, Dividends Per Share, Declared Restricted stock granted to non-employee directors (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Non-Option Equity Instruments, Granted Payouts for share-based awards granted as a percentage of target Share Based Compensation by Share Based Payment Award, Performance Target Payout This element represents the performance target payout ratios for performance-based awards granted during the reporting period. Dividends on preferred stock Dividends, Preferred Stock, Cash Changes in plan assets: Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] Business Combination, Asset Acquisition, and Joint Venture Formation [Abstract] Accrued liabilities Liability, Defined Benefit Plan, Current Proceeds from sale of assets and equity investments, net Proceeds from Sales of Business, Affiliate and Productive Assets Tax credit carryforward, valuation allowance Tax Credit Carryforward, Valuation Allowance Asset impairments and related items Non-Cash Portion Of Asset Impairment And Related Items Non-cash portion of asset impairment and related Items. Net loss attributable to common stockholders per share—diluted (in dollars per share) Business Acquisition, Pro Forma Earnings Per Share, Diluted Related Party [Domain] Related and Nonrelated Parties [Domain] Long-term Purchase Commitment [Line Items] Long-Term Purchase Commitment [Line Items] Less current maturities of finance leases Finance Lease, Liability, Current Maturities Finance Lease, Liability, Current Maturities Amount attributable to liabilities acquired Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities Deferred income taxes, net Total deferred income tax liability Deferred Income Tax Liabilities, Net 364-day term loan due 2025 364-Day Term Loan Due 2025 [Member] 364-Day Term Loan Due 2025 Schedule of changes in occidental's unvested cash- and tock- settled RSUs Share-Based Payment Arrangement, Restricted Stock Unit, Activity [Table Text Block] Current maturities of long-term debt Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Long-Term Debt Cash payments related to leases Cash Flow, Lessee [Abstract] Cash Flow, Lessee Retirement Plan Sponsor Location [Axis] Retirement Plan Sponsor Location [Axis] Tax impact from foreign operations Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Percent Capitalized interest Interest Costs Capitalized Adjustment Federal Deferred Federal Income Tax Expense (Benefit) Schedule of accrued liabilities Schedule of Accrued Liabilities [Table Text Block] Environmental, litigation, tax and other reserves Environmental Litigation Tax And Other Reserves [Member] Total costs accrued as of the balance sheet date for environmental, litigation, tax and other reserves. LAWSUITS, CLAIMS, COMMITMENTS AND CONTINGENCIES Commitments and Contingencies Disclosure [Text Block] Changes in the benefit obligation: Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] Measure: Measure [Axis] Increases related to current-year positions Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions Grant-date fair value of underlying Occidental common stock (in dollars per share) Share Price Issued (in shares) Stock Issued During Period, Shares, New Issues 2025 Defined Benefit Plan, Expected Future Benefit Payment, Year One Entity Emerging Growth Company Entity Emerging Growth Company Short position Short [Member] RISKS AND UNCERTAINTIES Risks And Uncertainties, Policy [Policy Text Block] Disclosure of accounting policy for risks and uncertainties that requires management to make informed estimates and judgments regarding certain types of financial statement balances and disclosures, such as the threat of expropriation of its assets by a foreign government, corruptions in foreign government, terrorism and civil unrest in foreign countries. It includes valuation allowance against net operating losses and other deferred tax assets to the extent it believes the future benefit from these assets will not be realized in the statutory carryforward periods. Risk includes, but not limited to, operations in countries that have experienced political instability, nationalizations, corruption, armed conflict, terrorism, insurgency, civil unrest, security problems, labor unrest. Other Other Security Investments [Member] Lessee, Lease, Description [Table] Lessee, Lease, Description [Table] Non-GAAP Measure Description Non-GAAP Measure Description [Text Block] Accumulated benefit obligation Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets, Accumulated Benefit Obligation Finance lease assets Finance Lease, Right-of-Use Asset, after Accumulated Amortization Equity Component [Domain] Equity Component [Domain] Preferred stock, par value (in dollars per share) Preferred Stock, Par or Stated Value Per Share Total amount recognized in consolidated balance sheet Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position Operating cash flow from discontinued operations Cash Provided by (Used in) Operating Activities, Discontinued Operations Adjustments to reconcile net income to net cash from operating activities: Adjustments, Noncash Items, to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Entity Shell Company Entity Shell Company Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code 2028 Defined Benefit Plan, Expected Future Benefit Payment, Year Four Plan Assets in Excess of Accumulated Benefit Obligation Defined Benefit Plan, Pension Plans with Plan Assets in Excess of Accumulated Benefit Obligations [Abstract] SEC Schedule, 12-09, Valuation Allowances and Reserves [Domain] SEC Schedule, 12-09, Valuation Allowances and Reserves [Domain] Cumulative undistributed earnings Retained Earnings, Undistributed Earnings from Equity Method Investees Statement [Table] Statement [Table] Accumulated other comprehensive loss included the following after-tax balances: Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax [Abstract] Consolidation Items [Domain] Consolidation Items [Domain] Interest paid Interest Paid, Excluding Capitalized Interest, Operating Activities Gross property, plant and equipment Property, Plant, and Equipment and Finance Lease Right-of-Use Asset, before Accumulated Depreciation and Amortization Level 1 Fair Value, Inputs, Level 1 [Member] Deferred compensation and benefits Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits Total current assets Current assets Assets, Current Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Senior notes Senior Notes [Member] Interest related to liabilities for unrecognized tax benefits Unrecognized Tax Benefits, Interest on Income Taxes Expense Due in three years Long-Term Debt, Maturity, Year Three Schedule of Long-term Debt Instruments [Table] Schedule of Long-Term Debt Instruments [Table] Employer contributions Defined Benefit Plan, Plan Assets, Contributions by Employer Intangible assets related to developed technology Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill Ingleside Ethylene LLC Ingleside Ethylene LLC [Member] Ingleside Ethylene LLC [Member] Accumulated Other Comprehensive Income (Loss) [Table] Accumulated Other Comprehensive Income (Loss) [Table] Interest, dividends and other income Interest, Dividends and Other Income Income derived from investments and income not otherwise specified in the income statement. Interest income represents earnings which reflect the time value of money or transactions in which the payments are for the use or forbearance of money. Dividend income represents a distribution of earnings to shareholders by investee companies. Entity Well-known Seasoned Issuer Entity Well-known Seasoned Issuer INCOME TAXES Income Tax Disclosure [Text Block] 2028 Lessee, Operating Lease, Liability, to be Paid, Year Four 4.100% senior notes due 2047 Senior Notes 4.100 Percent Due 2047 [Member] Senior Notes 4.100 Percent Due 2047 [Member] Taxes other than on income Accrual for Taxes Other than Income Taxes, Current Domestic Plan Domestic Plan [Member] Period of expending 40 percent of environmental reserves Period of Expending 40 Percent of Environmental Reserves The number of future years over which the entity anticipates expenditures amounting to about 40 percent of the current environmental reserves. Weighted average discount rate, operating lease Operating Lease, Weighted Average Discount Rate, Percent Net cash provided (used) by financing activities Net Cash Provided by (Used in) Financing Activities Office Space Office Space [Member] Office Space Net proceeds from sale of equity investment Proceeds from Sale of Equity Method Investments Oman OMAN Credit Facility [Axis] Credit Facility [Axis] Estimated fair value of debt Long-Term Debt, Fair Value Entity Registrant Name Entity Registrant Name Cash portion of Acquisition consideration Total Cash Purchase Price Payments to Acquire Businesses, Gross Materials and supplies Other Inventory, Supplies, Gross Adjustment to Non-PEO NEO Compensation Footnote Adjustment to Non-PEO NEO Compensation Footnote [Text Block] Depreciation, depletion and amortization Depreciation, depletion and amortization of assets Depreciation, Depletion and Amortization CROCEI awards Return On Capital Employed Incentive And Return On Assets Incentives Awards [Member] Represents share-equivalents granted to employees that vest based on performance targets based on return on assets of the applicable segment or return on capital employed. Minimum period of expending second half of environmental reserves Minimum Period of Expending Second Half of Environmental Reserves The minimum number of future years, subsequent to the years of expenditures amounting to about the first half of the current environmental reserves, where in the entity anticipates expending the remaining reserves. Equity Method Investment, Nonconsolidated Investee Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member] State and local Deferred State and Local Income Tax Expense (Benefit) Fair Value as of Grant Date Award Grant Date Fair Value Other long-term assets Assets for Plan Benefits, Defined Benefit Plan Third-Party Sites Third Party Sites [Member] This element indicates sites not listed or proposed for listing by the U.S. Environmental Protection Agency on the CERCLA National Priorities List (NPL), which are operated by third parties. Level 2 Fair Value, Inputs, Level 2 [Member] Amortization period (in years) Finite-Lived Intangible Assets, Remaining Amortization Period Geographical [Domain] Geographical [Domain] Schedule of revenue from customers by segment, product, and geographical area Disaggregation of Revenue [Table Text Block] PRINCIPLES OF CONSOLIDATION Consolidation, Policy [Policy Text Block] Restatement Determination Date: Restatement Determination Date [Axis] Title of 12(b) Security Title of 12(b) Security Interest amount Payments For Legal Settlements, Interest Amount Payments For Legal Settlements, Interest Amount Common stock, $0.20 per share par value, authorized shares: 1.5 billion, issued shares: 2024 — 1,166,769,167 and 2023 — 1,107,516,500 Common Stock, Value, Issued Document Financial Statement Error Correction [Flag] Document Financial Statement Error Correction [Flag] Decrease in unrecognized tax benefits resulting from settlements with taxing authorities or lapses in statues of limitations Unrecognized Tax Benefits, Decrease Resulting From Settlements With Taxing Authorities Or Lapses Of Application Statue of Limitations Unrecognized Tax Benefits, Decrease Resulting From Settlements With Taxing Authorities Or Lapses Of Application Statue of Limitations International Foreign Segment [Member] Foreign Segment [Member] Operating cash flows from finance leases Finance Lease, Interest Payment on Liability Expected contribution to defined benefit pension plans in next fiscal year Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year Amounts recognized in the Consolidated Balance Sheet: Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract] Share-based Payment Arrangement [Abstract] Share-Based Payment Arrangement [Abstract] Beginning balance Ending balance Asset Retirement Obligation Common Stock issued for CrownRock acquisition Stock Issued During Period, Value, Acquisitions Finance lease, liability, current, statement of financial position Finance Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] Netting, asset Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset Two-year term loan due 2026 Two-year term loan due 2026 (6.249% as of December 31, 2024) Two Year Term Loan Due 2026 [Member] Two Year Term Loan Due 2026 CrownRock Acquisition (in shares) Issued as part of the acquisition (in shares) Stock Issued During Period, Shares, Acquisitions State income taxes, net of federal benefit Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent All other Deferred Tax Assets, Other 6.950% senior notes due 2024 Senior Notes 6.950 Percent Due 2024 [Member] Senior Notes 6.950 Percent Due 2024 [Member] Proceeds from exercise of warrants and options Proceeds From Warrant And Stock Option Exercises Proceeds From Warrant And Stock Option Exercises CASH FLOW FROM FINANCING ACTIVITIES Net Cash Provided by (Used in) Financing Activities [Abstract] 2029 Defined Benefit Plan, Expected Future Benefit Payment, Year Five Preferred stock, at $1.00 per share par value, issued shares: 2024 — 84,897 and 2023 — 84,897 Preferred Stock, Value, Issued Commodity inventory and finished goods Inventory, Finished Goods, Gross Total deferred tax liabilities Gross long-term deferred tax liabilities Deferred Tax Liabilities, Gross Cumulative accrued interest related to liabilities for unrecognized tax benefits Unrecognized Tax Benefits, Cumulative Interest on Income Taxes Accrued Unrecognized Tax Benefits, Cumulative Interest on Income Taxes Accrued Net income attributable to common stockholders—basic (in dollars per share) Basic earnings per common share (in dollars per share) Earnings Per Share, Basic 2025 Operating And Finance Lease, Liability, Payments, Due Year One Operating And Finance Lease, Liability, Payments, Due Year One Proceeds from issuance of common stock Proceeds from Issuance of Common Stock Operating cash flows from operating leases Operating Lease, Payments Award Timing MNPI Disclosure Award Timing MNPI Disclosure [Text Block] ACQUISITIONS, DIVESTITURES AND OTHER TRANSACTIONS Business Combinations, Asset Acquisitions Dispositions and Other Disclosure [Text Block] Description of significant business acquisitions (or series of individually immaterial business combinations or asset acquisitions) planned, initiated, or completed during the period, including background, timing, and allocation of acquisition costs. Includes description of significant business or asset dispositions completed during the period, including background, timing and disclosures for discontinued operations, if applicable. Also includes description of other applicable transactions. This element may be used as a single block of text to encapsulate all disclosures (including data and tables) regarding business combinations, asset acquisitions, business or asset dispositions, including leverage buyout transactions and other transactions. Ownership [Domain] Ownership [Domain] 7.950% senior notes due 2039 Senior Notes 7.950 Percent Due 2039 [Member] Senior Notes 7.950 Percent Due 2039 [Member] Aggregate Pension Adjustments Service Cost Aggregate Pension Adjustments Service Cost [Member] Number of sites with significant environmental remediation reserves Number of Sites Significant Amount of Reserve This element represents the number of sites for which the reporting entity has established environmental remediation reserves. The sites' reserves represent a significant portion of the reporting entity's total environmental remediation reserve associated with the type of environmental remediation site. Midstream and marketing Midstream Segment [Member] This member represents the midstream segment. 5.875% senior notes due 2025 Senior Notes 5.875 Percent Due 2025 [Member] Senior Notes 5.875 Percent Due 2025 Disposal Group, Held-for-Sale, Not Discontinued Operations Disposal Group, Held-for-Sale, Not Discontinued Operations [Member] PROPERTY, PLANT AND EQUIPMENT Property, Plant and Equipment, Policy [Policy Text Block] Total current liabilities Current liabilities Liabilities, Current Dividends received as return on investment Proceeds from Equity Method Investment, Distribution Volatility factor Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Weighted Average Volatility Rate Compressors Compressors [Member] Compressors [Member] Equity Method Investment, Nonconsolidated Investee [Domain] Equity Method Investment, Nonconsolidated Investee [Domain] Granted (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period Pension and postretirement gains (losses) Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, after Tax Proceeds from settlement Proceeds from Legal Settlements Environmental reserves, exceeding $ ten million, number of sites Environmental Reserves Exceeding Ten Million Site Category, Number of Sites This item represents the number of sites with each site's reserves exceeding ten million. Interest and debt expense, net Interest and debt expense, net Interest and Debt Expense Reclassifications to property, plant and equipment based on the determination of proved reserves Oil and Gas, Capitalized Exploratory Well Cost, Reclassification Based on Determination of Proved Reserve Transportation and gathering expense Transportation And Gathering Expense Transportation And Gathering Expense Class of Warrant or Right [Domain] Class of Warrant or Right [Domain] Exercise price of warrants (in dollars per share) Class of Warrant or Right, Exercise Price of Warrants or Rights Discount rate Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate Operating Activities [Domain] Operating Activities [Domain] Schedule of reconciliation of revenue from customers to total net sales Reconciliation Of Revenue From Customers and Other Revenue To Total Revenue [Table Text Block] The disclosure of reconciliation of revenue from customers and other revenue to total revenue. Net sales Net sales Sales Revenues STOCK-BASED INCENTIVE PLANS Share-Based Payment Arrangement [Text Block] Preferred stock dividends paid Payments of Ordinary Dividends, Preferred Stock and Preference Stock Operating and capital costs percentage Oil And Gas, Proved Reserve, Operating And Capital Costs, Percentage Increase Oil And Gas, Proved Reserve, Operating And Capital Costs, Percentage Increase Entity Address, City or Town Entity Address, City or Town Issuance of shares upon approval (in shares) Business Acquisition, Equity Interest Issued Or Issuable, Number Of Shares Expected To Transfer Upon Closing Business Acquisition, Equity Interest Issued Or Issuable, Number Of Shares Expected To Transfer Upon Closing Intrinsic value of options exercises Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period, Intrinsic Value ASSET RETIREMENT OBLIGATIONS Asset Retirement Obligation [Policy Text Block] Compensation expense Share-Based Payment Arrangement, Expense Non-voting general partner interest Limited Liability Company (LLC) or Limited Partnership (LP), Non-Voting General Partner Unit Interest, Percentage Limited Liability Company (LLC) or Limited Partnership (LP), Non-Voting General Partner Unit Interest, Percentage Forfeitures (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeited in Period Cash portion of purchase price Payments To Acquire Businesses, Gross, Prior To Closing Adjustments Payments To Acquire Businesses, Gross, Prior To Closing Adjustments Equity interest in acquiree, remeasurement gain Business Combination, Step Acquisition, Equity Interest in Acquiree, Remeasurement Gain Benefit Obligation Assumptions: Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract] Business Acquisition [Axis] Business Acquisition [Axis] Debt assumed Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Liabilities, Long-Term Debt Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Liabilities, Long-Term Debt Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year [Member] Deferred tax assets, operating activity Deferred Tax Assets, Not Likely To Be Recovered, Amount Deferred Tax Assets, Not Likely To Be Recovered, Amount Foreign Foreign Tax Jurisdiction [Member] Common stock, redemption threshold, per share (in dollars per share) Common Stock, Redemption Threshold, Per Share Common Stock, Redemption Threshold, Per Share Finance Leases Finance Lease, Liability, to be Paid, Fiscal Year Maturity [Abstract] TREASURY STOCK Treasury Stock, Number of Shares and Restriction Disclosures [Abstract] Anadarko Petroleum Corporation Anadarko Petroleum Corporation [Member] Anadarko Petroleum Corporation [Member] REVENUE Revenue from Contract with Customer [Text Block] Document Fiscal Year Focus Document Fiscal Year Focus Currently Operated Sites Entity Operated Sites [Member] This element indicates sites not listed or proposed for listing by the U.S. Environmental Protection Agency on the CERCLA National Priorities List (NPL), which are operated by the entity. 7.730% debentures due 2096 Debentures 7.730 Percent Due 2096 [Member] Debentures 7.730 Percent Due 2096 [Member] Purchases of treasury stock Treasury Stock, Value, Acquired, Cost Method Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Draws on receivables securitization facility Proceeds from Accounts Receivable Securitization Unamortized premium, net Debt Instrument, Unamortized Discount (Premium), Net Document Period End Date Document Period End Date Contributions from noncontrolling interest Proceeds from Noncontrolling Interests Current finance leases Finance Lease, Liability, Current Diamond Alkali Superfund Site - Operable Unit One Diamond Alkali Superfund Site - Operable Unit One [Member] Diamond Alkali Superfund Site - Operable Unit One Total lease payments Lessee, Operating Lease, Liability, to be Paid Unvested, beginning of period (in shares) Unvested, end of period (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number Undistributed losses (earnings) from equity investments Income (Loss) from Equity Method Investments, Net of Dividends or Distributions Insider Trading Arrangements [Line Items] Qatar QATAR Gain on sale Gain (Loss) on Disposition of Stock in Subsidiary or Equity Method Investee Number of parties, settled Number Of Parties, Settled Number Of Parties, Settled Other current assets Other Current Assets [Member] 2027 Lessee, Operating Lease, Liability, to be Paid, Year Three 6.050% senior notes due 2054 6.050% senior notes due 2054 Senior Notes 6.050 Percent Due 2054 [Member] Senior Notes 6.050 Percent Due 2054 Purchases Related Party Transaction, Purchases from Related Party Accounts payable Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accounts Payable Schedule of purchase consideration Schedule of Business Acquisitions, by Acquisition [Table Text Block] Maxus Filed Bankruptcy Maxus Filed Bankruptcy [Member] Maxus Filed Bankruptcy Document Transition Report Document Transition Report Schedule of reconciliation of the beginning and ending amount of unrecognized tax benefits Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block] Fair Value, Recurring and Nonrecurring [Table] Fair Value, Recurring and Nonrecurring [Table] Entity Current Reporting Status Entity Current Reporting Status Retained Earnings Retained Earnings [Member] Fair value of plan assets, net of net payables Defined Benefit Plan, Plan Assets, Amount, Net Of Payables Defined Benefit Plan, Plan Assets, Amount, Net Of Payables Investments And Related Party Transactions Disclosure [Abstract] Investments And Related Party Transactions Disclosure [Abstract] Investments And Related Party Transactions Disclosure [Abstract] Vested (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested, Number of Shares RSUs Restricted Stock Units (RSUs) [Member] NON-CONTROLLING INTEREST Consolidation, Subsidiaries or Other Investments, Consolidated Entities, Policy [Policy Text Block] Increase (Decrease) in Stockholders' Equity Increase (Decrease) in Stockholders' Equity [Roll Forward] Executive Category: Executive Category [Axis] Carbon Engineering acquisition payable Accrued Acquisition Payable Current Accrued Acquisition Payable Current Other International Other Foreign Segment [Member] Other Foreign Segment [Member] Schedule of income tax (expense) benefit for domestic and foreign income taxes on continuing operations Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] Schedule of funding status of occidental's plans Changes in Projected Benefit Obligations, Fair Value of Plan Assets, and Funded Status of Plan [Table Text Block] Statement of Income Location, Balance [Domain] Statement of Income Location, Balance [Domain] Projected annual rates of healthcare cost trend rates, year nine and beyond (as a percent) Defined Benefit Plan, Health Care Cost Trend Rate Assumed, Year Nine And Thereafter Defined Benefit Plan, Health Care Cost Trend Rate Assumed, Year Nine And Thereafter Company Selected Measure Name Company Selected Measure Name