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Document Period End Date Document Period End Date Changes in Operating Assets and Liabilities: Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity, Increase (Decrease) in Operating Capital [Abstract] Net Cash Used In Investing Activities Cash Provided by (Used in) Investing Activity, Including Discontinued Operation Equity Awards Adjustments, Excluding Value Reported in Compensation Table Equity Awards Adjustments, Excluding Value Reported in the Compensation Table [Member] Number of other U.S.-based entities mentioned in class action lawsuit Loss Contingency, Claims Filed, Number Of Entities Loss Contingency, Claims Filed, Number Of Entities Casualty and catastrophic property deductible Casualty And Catastrophic Property Deductible Deductible amount for casualty and catastrophic property programs. 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Income (Loss), Net of Tax, Period Change [Abstract] Fair Value Measurements Fair Value Measurement, Policy [Policy Text Block] Erroneously Awarded Compensation Recovery Erroneously Awarded Compensation Recovery [Table] Beginning Balance (in shares) Ending Balance (in shares) Common Stock, Shares, Outstanding Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Award Timing Disclosures [Line Items] Schedule of Fair Value and Carrying Value of Long-Term Debt Fair Value, by Balance Sheet Grouping [Table Text Block] Net Earnings Per Share, Assuming Dilution (in dollars per share) Net Earnings Per Share, Assuming Dilution (in dollars per share) Earnings Per Share, Diluted Accumulated Other Comprehensive Income (Loss) [Table] Accumulated Other Comprehensive Income (Loss) [Table] Entity Current Reporting Status Entity Current Reporting Status Net Cash Used in Financing Activities Cash Provided by (Used in) Financing Activity, 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Company has been identified as a potentially responsible party. 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Stock Plans and Share-Based Compensation Compensation Related Costs, Policy [Policy Text Block] Company Selected Measure Amount Company Selected Measure Amount Depreciation and Amortization Depreciation, Depletion and Amortization Entity Address, Address Line Two Entity Address, Address Line Two Accounts and Financing Receivables [Table] Accounts and Financing Receivables [Table] Occidental Petroleum Corporation Occidental Petroleum Corporation [Member] Occidental Petroleum Corporation Current Assets: Assets, Current [Abstract] Non-PEO NEO Non-PEO NEO [Member] Entity Address, Address Line One Entity Address, Address Line One Income Tax Expense Income Tax Expense (Benefit) Fair Value Hedging Fair Value Hedging [Member] Award Timing Method Award Timing Method [Text Block] Loss Contingency, Nature [Domain] Loss Contingency, Nature [Domain] Net Increase (Decrease) in Cash and Cash Equivalents Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Income Statement Numerator: Net Income (Loss) Attributable to Parent [Abstract] Contingencies [Table] Contingencies [Table] Contingencies [Table] Casualty, Environmental and Other Reserves (Note 4) Current Loss Contingency, Accrual, Current Amortization of Net Loss Defined Benefit Plan, Amortization of Gain (Loss) Fuel Fuel Fuel Costs Net Earnings Net Earnings Net Earnings Net Income (Loss) Attributable to Parent Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] Statement [Table] Statement [Table] Proceeds and Advances from Property Dispositions Proceeds from Sale of Property, Plant, and Equipment Restatement Determination Date: Restatement Determination Date [Axis] Exchange-traded Funds Exchange Traded Funds [Member] Schedule of Changes in AOCI balance by Components Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Derivative, term of contract Derivative, Contract Term Litigation settlement, amount awarded to other party Litigation Settlement, Amount Awarded to Other Party Derivative instrument, period following debt maturity, hedged transaction Derivative Instrument, Period Following Debt Maturity, Hedged Transaction Derivative Instrument, Period Following Debt Maturity, Hedged Transaction Casualty Unpaid Policy Claims and Claims Adjustment Expense, Policy [Policy Text Block] Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block]