3.19.3.a.u2 html 479 623 1 true 164 0 false 14 false false R1.htm 0001000 - Document - Cover Page Sheet http://www.oxy.com/role/CoverPage Cover Page Cover 1 false false R2.htm 1001000 - Statement - Consolidated Balance Sheets Sheet http://www.oxy.com/role/ConsolidatedBalanceSheets Consolidated Balance Sheets Statements 2 false false R3.htm 1001501 - Statement - Consolidated Balance Sheets (Parenthetical) Sheet http://www.oxy.com/role/ConsolidatedBalanceSheetsParenthetical Consolidated Balance Sheets (Parenthetical) Statements 3 false false R4.htm 1002000 - Statement - Consolidated Statements of Operations Sheet http://www.oxy.com/role/ConsolidatedStatementsOfOperations Consolidated Statements of Operations Statements 4 false false R5.htm 1003000 - Statement - Consolidated Statements of Comprehensive Income Sheet http://www.oxy.com/role/ConsolidatedStatementsOfComprehensiveIncome Consolidated Statements of Comprehensive Income Statements 5 false false R6.htm 1003501 - Statement - Consolidated Statements of Comprehensive Income (Parenthetical) Sheet http://www.oxy.com/role/ConsolidatedStatementsOfComprehensiveIncomeParenthetical Consolidated Statements of Comprehensive Income (Parenthetical) Statements 6 false false R7.htm 1004000 - Statement - Consolidated Statements of Equity Sheet http://www.oxy.com/role/ConsolidatedStatementsOfEquity Consolidated Statements of Equity Statements 7 false false R8.htm 1004501 - Statement - Consolidated Statements of Equity (Parenthetical) Sheet http://www.oxy.com/role/ConsolidatedStatementsOfEquityParenthetical Consolidated Statements of Equity (Parenthetical) Statements 8 false false R9.htm 1005000 - Statement - Consolidated Statements of Cash Flows Sheet http://www.oxy.com/role/ConsolidatedStatementsOfCashFlows Consolidated Statements of Cash Flows Statements 9 false false R10.htm 2101100 - Disclosure - NATURE OF BUSINESS, SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES AND OTHER Sheet http://www.oxy.com/role/NatureOfBusinessSummaryOfSignificantAccountingPoliciesAndOther NATURE OF BUSINESS, SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES AND OTHER Notes 10 false false R11.htm 2102100 - Disclosure - ACCOUNTING AND DISCLOSURE CHANGES Sheet http://www.oxy.com/role/AccountingAndDisclosureChanges ACCOUNTING AND DISCLOSURE CHANGES Notes 11 false false R12.htm 2103100 - Disclosure - PROPERTY, PLANT AND EQUIPMENT Sheet http://www.oxy.com/role/PropertyPlantAndEquipment PROPERTY, PLANT AND EQUIPMENT Notes 12 false false R13.htm 2104100 - Disclosure - ACQUISITIONS AND DIVESTITURES Sheet http://www.oxy.com/role/AcquisitionsAndDivestitures ACQUISITIONS AND DIVESTITURES Notes 13 false false R14.htm 2105100 - Disclosure - JOINT VENTURES Sheet http://www.oxy.com/role/JointVentures JOINT VENTURES Notes 14 false false R15.htm 2106100 - Disclosure - DEBT Sheet http://www.oxy.com/role/Debt DEBT Notes 15 false false R16.htm 2107100 - Disclosure - LEASES Sheet http://www.oxy.com/role/Leases LEASES Notes 16 false false R17.htm 2108100 - Disclosure - LAWSUITS, CLAIMS, COMMITMENTS AND CONTINGENCIES Sheet http://www.oxy.com/role/LawsuitsClaimsCommitmentsAndContingencies LAWSUITS, CLAIMS, COMMITMENTS AND CONTINGENCIES Notes 17 false false R18.htm 2109100 - Disclosure - DERIVATIVES Sheet http://www.oxy.com/role/Derivatives DERIVATIVES Notes 18 false false R19.htm 2110100 - Disclosure - INCOME TAXES Sheet http://www.oxy.com/role/IncomeTaxes INCOME TAXES Notes 19 false false R20.htm 2111100 - Disclosure - STOCK-BASED COMPENSATION Sheet http://www.oxy.com/role/StockBasedCompensation STOCK-BASED COMPENSATION Notes 20 false false R21.htm 2112100 - Disclosure - EQUITY Sheet http://www.oxy.com/role/Equity EQUITY Notes 21 false false R22.htm 2113100 - Disclosure - EARNINGS PER SHARE Sheet http://www.oxy.com/role/EarningsPerShare EARNINGS PER SHARE Notes 22 false false R23.htm 2114100 - Disclosure - PENSION AND POSTRETIREMENT BENEFIT PLANS Sheet http://www.oxy.com/role/PensionAndPostretirementBenefitPlans PENSION AND POSTRETIREMENT BENEFIT PLANS Notes 23 false false R24.htm 2115100 - Disclosure - REVENUE RECOGNITION Sheet http://www.oxy.com/role/RevenueRecognition REVENUE RECOGNITION Notes 24 false false R25.htm 2116100 - Disclosure - CONDENSED CONSOLIDATING FINANCIAL INFORMATION Sheet http://www.oxy.com/role/CondensedConsolidatingFinancialInformation CONDENSED CONSOLIDATING FINANCIAL INFORMATION Notes 25 false false R26.htm 2117100 - Disclosure - SUBSEQUENT EVENT (Notes) Notes http://www.oxy.com/role/SubsequentEventNotes SUBSEQUENT EVENT (Notes) Notes 26 false false R27.htm 2201201 - Disclosure - NATURE OF BUSINESS, SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES AND OTHER (Policies) Sheet http://www.oxy.com/role/NatureOfBusinessSummaryOfSignificantAccountingPoliciesAndOtherPolicies NATURE OF BUSINESS, SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES AND OTHER (Policies) Policies 27 false false R28.htm 2301302 - Disclosure - NATURE OF BUSINESS, SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES AND OTHER (Tables) Sheet http://www.oxy.com/role/NatureOfBusinessSummaryOfSignificantAccountingPoliciesAndOtherTables NATURE OF BUSINESS, SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES AND OTHER (Tables) Tables http://www.oxy.com/role/NatureOfBusinessSummaryOfSignificantAccountingPoliciesAndOther 28 false false R29.htm 2303301 - Disclosure - PROPERTY, PLANT AND EQUIPMENT (Tables) Sheet http://www.oxy.com/role/PropertyPlantAndEquipmentTables PROPERTY, PLANT AND EQUIPMENT (Tables) Tables http://www.oxy.com/role/PropertyPlantAndEquipment 29 false false R30.htm 2304301 - Disclosure - ACQUISITIONS AND DIVESTITURES (Tables) Sheet http://www.oxy.com/role/AcquisitionsAndDivestituresTables ACQUISITIONS AND DIVESTITURES (Tables) Tables http://www.oxy.com/role/AcquisitionsAndDivestitures 30 false false R31.htm 2305301 - Disclosure - JOINT VENTURES (Tables) Sheet http://www.oxy.com/role/JointVenturesTables JOINT VENTURES (Tables) Tables http://www.oxy.com/role/JointVentures 31 false false R32.htm 2306301 - Disclosure - DEBT (Tables) Sheet http://www.oxy.com/role/DebtTables DEBT (Tables) Tables http://www.oxy.com/role/Debt 32 false false R33.htm 2307301 - Disclosure - LEASES (Tables) Sheet http://www.oxy.com/role/LeasesTables LEASES (Tables) Tables http://www.oxy.com/role/Leases 33 false false R34.htm 2308301 - Disclosure - LAWSUITS, CLAIMS, COMMITMENTS AND CONTINGENCIES (Tables) Sheet http://www.oxy.com/role/LawsuitsClaimsCommitmentsAndContingenciesTables LAWSUITS, CLAIMS, COMMITMENTS AND CONTINGENCIES (Tables) Tables http://www.oxy.com/role/LawsuitsClaimsCommitmentsAndContingencies 34 false false R35.htm 2309301 - Disclosure - DERIVATIVES (Tables) Sheet http://www.oxy.com/role/DerivativesTables DERIVATIVES (Tables) Tables http://www.oxy.com/role/Derivatives 35 false false R36.htm 2310301 - Disclosure - INCOME TAXES (Tables) Sheet http://www.oxy.com/role/IncomeTaxesTables INCOME TAXES (Tables) Tables http://www.oxy.com/role/IncomeTaxes 36 false false R37.htm 2311301 - Disclosure - STOCK-BASED COMPENSATION (Tables) Sheet http://www.oxy.com/role/StockBasedCompensationTables STOCK-BASED COMPENSATION (Tables) Tables http://www.oxy.com/role/StockBasedCompensation 37 false false R38.htm 2312301 - Disclosure - EQUITY (Tables) Sheet http://www.oxy.com/role/EquityTables EQUITY (Tables) Tables http://www.oxy.com/role/Equity 38 false false R39.htm 2313301 - Disclosure - EARNINGS PER SHARE (Tables) Sheet http://www.oxy.com/role/EarningsPerShareTables EARNINGS PER SHARE (Tables) Tables http://www.oxy.com/role/EarningsPerShare 39 false false R40.htm 2314301 - Disclosure - PENSION AND POSTRETIREMENT BENEFIT PLANS (Tables) Sheet http://www.oxy.com/role/PensionAndPostretirementBenefitPlansTables PENSION AND POSTRETIREMENT BENEFIT PLANS (Tables) Tables http://www.oxy.com/role/PensionAndPostretirementBenefitPlans 40 false false R41.htm 2315301 - Disclosure - REVENUE RECOGNITION (Tables) Sheet http://www.oxy.com/role/RevenueRecognitionTables REVENUE RECOGNITION (Tables) Tables http://www.oxy.com/role/RevenueRecognition 41 false false R42.htm 2316301 - Disclosure - CONDENSED CONSOLIDATING FINANCIAL INFORMATION (Tables) Sheet http://www.oxy.com/role/CondensedConsolidatingFinancialInformationTables CONDENSED CONSOLIDATING FINANCIAL INFORMATION (Tables) Tables http://www.oxy.com/role/CondensedConsolidatingFinancialInformation 42 false false R43.htm 2401403 - Disclosure - NATURE OF BUSINESS, SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES AND OTHER - Concentration of Customers (Details) Sheet http://www.oxy.com/role/NatureOfBusinessSummaryOfSignificantAccountingPoliciesAndOtherConcentrationOfCustomersDetails NATURE OF BUSINESS, SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES AND OTHER - Concentration of Customers (Details) Details 43 false false R44.htm 2401404 - Disclosure - NATURE OF BUSINESS, SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES AND OTHER - Property, Plant and Equipment (Details) Sheet http://www.oxy.com/role/NatureOfBusinessSummaryOfSignificantAccountingPoliciesAndOtherPropertyPlantAndEquipmentDetails NATURE OF BUSINESS, SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES AND OTHER - Property, Plant and Equipment (Details) Details 44 false false R45.htm 2401405 - Disclosure - NATURE OF BUSINESS, SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES AND OTHER - Inventories (Details) Sheet http://www.oxy.com/role/NatureOfBusinessSummaryOfSignificantAccountingPoliciesAndOtherInventoriesDetails NATURE OF BUSINESS, SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES AND OTHER - Inventories (Details) Details http://www.oxy.com/role/NatureOfBusinessSummaryOfSignificantAccountingPoliciesAndOtherTables 45 false false R46.htm 2401406 - Disclosure - NATURE OF BUSINESS, SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES AND OTHER - Asset Retirement Obligations (Details) Sheet http://www.oxy.com/role/NatureOfBusinessSummaryOfSignificantAccountingPoliciesAndOtherAssetRetirementObligationsDetails NATURE OF BUSINESS, SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES AND OTHER - Asset Retirement Obligations (Details) Details 46 false false R47.htm 2401407 - Disclosure - NATURE OF BUSINESS, SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES AND OTHER - Income Taxes (Details) Sheet http://www.oxy.com/role/NatureOfBusinessSummaryOfSignificantAccountingPoliciesAndOtherIncomeTaxesDetails NATURE OF BUSINESS, SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES AND OTHER - Income Taxes (Details) Details http://www.oxy.com/role/NatureOfBusinessSummaryOfSignificantAccountingPoliciesAndOtherTables 47 false false R48.htm 2401408 - Disclosure - NATURE OF BUSINESS, SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES AND OTHER - Production Sharing - Type Contracts and Cash (Details) Sheet http://www.oxy.com/role/NatureOfBusinessSummaryOfSignificantAccountingPoliciesAndOtherProductionSharingTypeContractsAndCashDetails NATURE OF BUSINESS, SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES AND OTHER - Production Sharing - Type Contracts and Cash (Details) Details 48 false false R49.htm 2401409 - Disclosure - NATURE OF BUSINESS, SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES AND OTHER - Cash (Details) Sheet http://www.oxy.com/role/NatureOfBusinessSummaryOfSignificantAccountingPoliciesAndOtherCashDetails NATURE OF BUSINESS, SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES AND OTHER - Cash (Details) Details http://www.oxy.com/role/NatureOfBusinessSummaryOfSignificantAccountingPoliciesAndOtherTables 49 false false R50.htm 2401410 - Disclosure - NATURE OF BUSINESS, SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES AND OTHER - Other Current Assets (Details) Sheet http://www.oxy.com/role/NatureOfBusinessSummaryOfSignificantAccountingPoliciesAndOtherOtherCurrentAssetsDetails NATURE OF BUSINESS, SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES AND OTHER - Other Current Assets (Details) Details 50 false false R51.htm 2401411 - Disclosure - NATURE OF BUSINESS, SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES AND OTHER - Accrued Liabilities (Details) Sheet http://www.oxy.com/role/NatureOfBusinessSummaryOfSignificantAccountingPoliciesAndOtherAccruedLiabilitiesDetails NATURE OF BUSINESS, SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES AND OTHER - Accrued Liabilities (Details) Details 51 false false R52.htm 2401412 - Disclosure - NATURE OF BUSINESS, SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES AND OTHER - Supplemental Cash Flow Information (Details) Sheet http://www.oxy.com/role/NatureOfBusinessSummaryOfSignificantAccountingPoliciesAndOtherSupplementalCashFlowInformationDetails NATURE OF BUSINESS, SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES AND OTHER - Supplemental Cash Flow Information (Details) Details 52 false false R53.htm 2402401 - Disclosure - ACCOUNTING AND DISCLOSURE CHANGES Recently Adopted Accounting Disclosure Changes (Details) Sheet http://www.oxy.com/role/AccountingAndDisclosureChangesRecentlyAdoptedAccountingDisclosureChangesDetails ACCOUNTING AND DISCLOSURE CHANGES Recently Adopted Accounting Disclosure Changes (Details) Details 53 false false R54.htm 2403402 - Disclosure - PROPERTY, PLANT AND EQUIPMENT (Details) Sheet http://www.oxy.com/role/PropertyPlantAndEquipmentDetails PROPERTY, PLANT AND EQUIPMENT (Details) Details http://www.oxy.com/role/PropertyPlantAndEquipmentTables 54 false false R55.htm 2404402 - Disclosure - ACQUISITIONS AND DIVESTITURES - Elk Hills Transaction Paragraph (Details) Sheet http://www.oxy.com/role/AcquisitionsAndDivestituresElkHillsTransactionParagraphDetails ACQUISITIONS AND DIVESTITURES - Elk Hills Transaction Paragraph (Details) Details 55 false false R56.htm 2404403 - Disclosure - ACQUISITIONS AND DIVESTITURES - Elk Hills Table (Details) Sheet http://www.oxy.com/role/AcquisitionsAndDivestituresElkHillsTableDetails ACQUISITIONS AND DIVESTITURES - Elk Hills Table (Details) Details 56 false false R57.htm 2404404 - Disclosure - ACQUISITIONS AND DIVESTITURES - Office Building and Land (Details) Sheet http://www.oxy.com/role/AcquisitionsAndDivestituresOfficeBuildingAndLandDetails ACQUISITIONS AND DIVESTITURES - Office Building and Land (Details) Details 57 false false R58.htm 2404405 - Disclosure - ACQUISITIONS AND DIVESTITURES - Other Upstream Acquisitions (Details) Sheet http://www.oxy.com/role/AcquisitionsAndDivestituresOtherUpstreamAcquisitionsDetails ACQUISITIONS AND DIVESTITURES - Other Upstream Acquisitions (Details) Details 58 false false R59.htm 2404406 - Disclosure - ACQUISITIONS AND DIVESTITURES - Divestitures (Details) Sheet http://www.oxy.com/role/AcquisitionsAndDivestituresDivestituresDetails ACQUISITIONS AND DIVESTITURES - Divestitures (Details) Details 59 false false R60.htm 2405402 - Disclosure - JOINT VENTURES - Changes in Noncontrolling Interests (Details) Sheet http://www.oxy.com/role/JointVenturesChangesInNoncontrollingInterestsDetails JOINT VENTURES - Changes in Noncontrolling Interests (Details) Details 60 false false R61.htm 2405403 - Disclosure - JOINT VENTURES - Mezzanine Equity (Details) Sheet http://www.oxy.com/role/JointVenturesMezzanineEquityDetails JOINT VENTURES - Mezzanine Equity (Details) Details 61 false false R62.htm 2405404 - Disclosure - JOINT VENTURES - Ares (Details) Sheet http://www.oxy.com/role/JointVenturesAresDetails JOINT VENTURES - Ares (Details) Details 62 false false R63.htm 2405405 - Disclosure - JOINT VENTURES - BSP (Details) Sheet http://www.oxy.com/role/JointVenturesBspDetails JOINT VENTURES - BSP (Details) Details 63 false false R64.htm 2405406 - Disclosure - JOINT VENTURES - Other (Details) Sheet http://www.oxy.com/role/JointVenturesOtherDetails JOINT VENTURES - Other (Details) Details 64 false false R65.htm 2406402 - Disclosure - DEBT - Schedule of long-term debt (Details) Sheet http://www.oxy.com/role/DebtScheduleOfLongTermDebtDetails DEBT - Schedule of long-term debt (Details) Details 65 false false R66.htm 2406403 - Disclosure - DEBT - 2014 Revolving Credit Facility (Details) Sheet http://www.oxy.com/role/Debt2014RevolvingCreditFacilityDetails DEBT - 2014 Revolving Credit Facility (Details) Details 66 false false R67.htm 2406404 - Disclosure - DEBT - 2017 Credit Agreements (Details) Sheet http://www.oxy.com/role/Debt2017CreditAgreementsDetails DEBT - 2017 Credit Agreements (Details) Details 67 false false R68.htm 2406405 - Disclosure - DEBT - 2016 Credit Agreements (Details) Sheet http://www.oxy.com/role/Debt2016CreditAgreementsDetails DEBT - 2016 Credit Agreements (Details) Details 68 false false R69.htm 2406406 - Disclosure - DEBT - Second Lien Notes (Details) Notes http://www.oxy.com/role/DebtSecondLienNotesDetails DEBT - Second Lien Notes (Details) Details 69 false false R70.htm 2406407 - Disclosure - DEBT - Senior Notes (Details) Notes http://www.oxy.com/role/DebtSeniorNotesDetails DEBT - Senior Notes (Details) Details 70 false false R71.htm 2406408 - Disclosure - DEBT - Deferred Gain and Issuance Costs (Details) Sheet http://www.oxy.com/role/DebtDeferredGainAndIssuanceCostsDetails DEBT - Deferred Gain and Issuance Costs (Details) Details 71 false false R72.htm 2406409 - Disclosure - DEBT - Other (Details) Sheet http://www.oxy.com/role/DebtOtherDetails DEBT - Other (Details) Details 72 false false R73.htm 2407402 - Disclosure - LEASES - Operating lease costs (Details) Sheet http://www.oxy.com/role/LeasesOperatingLeaseCostsDetails LEASES - Operating lease costs (Details) Details 73 false false R74.htm 2407403 - Disclosure - LEASES - Supplemental Cash Flows (Details) Sheet http://www.oxy.com/role/LeasesSupplementalCashFlowsDetails LEASES - Supplemental Cash Flows (Details) Details 74 false false R75.htm 2407404 - Disclosure - LEASES - Supplement balance sheet information (Details) Sheet http://www.oxy.com/role/LeasesSupplementBalanceSheetInformationDetails LEASES - Supplement balance sheet information (Details) Details 75 false false R76.htm 2407405 - Disclosure - LEASES - Finance lease liabilities (Details) Sheet http://www.oxy.com/role/LeasesFinanceLeaseLiabilitiesDetails LEASES - Finance lease liabilities (Details) Details 76 false false R77.htm 2407406 - Disclosure - LEASES - Noncancelable operating leases (Details) Sheet http://www.oxy.com/role/LeasesNoncancelableOperatingLeasesDetails LEASES - Noncancelable operating leases (Details) Details 77 false false R78.htm 2408402 - Disclosure - LAWSUITS, CLAIMS, COMMITMENTS AND CONTINGENCIES (Details) Sheet http://www.oxy.com/role/LawsuitsClaimsCommitmentsAndContingenciesDetails LAWSUITS, CLAIMS, COMMITMENTS AND CONTINGENCIES (Details) Details http://www.oxy.com/role/LawsuitsClaimsCommitmentsAndContingenciesTables 78 false false R79.htm 2409402 - Disclosure - DERIVATIVES - Commodity Price Risk (Details) Sheet http://www.oxy.com/role/DerivativesCommodityPriceRiskDetails DERIVATIVES - Commodity Price Risk (Details) Details 79 false false R80.htm 2409403 - Disclosure - DERIVATIVES - Interest-Rate Contracts (Details) Sheet http://www.oxy.com/role/DerivativesInterestRateContractsDetails DERIVATIVES - Interest-Rate Contracts (Details) Details 80 false false R81.htm 2409404 - Disclosure - DERIVATIVES - Fair Value (Details) Sheet http://www.oxy.com/role/DerivativesFairValueDetails DERIVATIVES - Fair Value (Details) Details 81 false false R82.htm 2410402 - Disclosure - INCOME TAXES - Income and Provision for Income Tax (Details) Sheet http://www.oxy.com/role/IncomeTaxesIncomeAndProvisionForIncomeTaxDetails INCOME TAXES - Income and Provision for Income Tax (Details) Details 82 false false R83.htm 2410403 - Disclosure - INCOME TAXES - Income tax expense (benefit) (Details) Sheet http://www.oxy.com/role/IncomeTaxesIncomeTaxExpenseBenefitDetails INCOME TAXES - Income tax expense (benefit) (Details) Details 83 false false R84.htm 2410404 - Disclosure - INCOME TAXES - Deferred Tax Assets and Liabilities (Details) Sheet http://www.oxy.com/role/IncomeTaxesDeferredTaxAssetsAndLiabilitiesDetails INCOME TAXES - Deferred Tax Assets and Liabilities (Details) Details 84 false false R85.htm 2410405 - Disclosure - INCOME TAXES - Unrecognized Tax Benefits (Details) Sheet http://www.oxy.com/role/IncomeTaxesUnrecognizedTaxBenefitsDetails INCOME TAXES - Unrecognized Tax Benefits (Details) Details 85 false false R86.htm 2411402 - Disclosure - STOCK-BASED COMPENSATION - General (Details) Sheet http://www.oxy.com/role/StockBasedCompensationGeneralDetails STOCK-BASED COMPENSATION - General (Details) Details 86 false false R87.htm 2411403 - Disclosure - STOCK-BASED COMPENSATION STOCK-BASED COMPENSATION - Schedule of Stock-Based Compensation Expense (Details) Sheet http://www.oxy.com/role/StockBasedCompensationStockBasedCompensationScheduleOfStockBasedCompensationExpenseDetails STOCK-BASED COMPENSATION STOCK-BASED COMPENSATION - Schedule of Stock-Based Compensation Expense (Details) Details 87 false false R88.htm 2411404 - Disclosure - STOCK-BASED COMPENSATION - Restricted Stock (Details) Sheet http://www.oxy.com/role/StockBasedCompensationRestrictedStockDetails STOCK-BASED COMPENSATION - Restricted Stock (Details) Details 88 false false R89.htm 2411405 - Disclosure - STOCK-BASED COMPENSATION - Performance Stock Unit Awards (Details) Sheet http://www.oxy.com/role/StockBasedCompensationPerformanceStockUnitAwardsDetails STOCK-BASED COMPENSATION - Performance Stock Unit Awards (Details) Details 89 false false R90.htm 2411406 - Disclosure - STOCK-BASED COMPENSATION - Stock Options (Details) Sheet http://www.oxy.com/role/StockBasedCompensationStockOptionsDetails STOCK-BASED COMPENSATION - Stock Options (Details) Details 90 false false R91.htm 2411407 - Disclosure - STOCK-BASED COMPENSATION STOCK-BASED COMPENSATION - Stock Awards (Details) Sheet http://www.oxy.com/role/StockBasedCompensationStockBasedCompensationStockAwardsDetails STOCK-BASED COMPENSATION STOCK-BASED COMPENSATION - Stock Awards (Details) Details 91 false false R92.htm 2411408 - Disclosure - STOCK-BASED COMPENSATION - Employee Stock Purchase Plan (Details) Sheet http://www.oxy.com/role/StockBasedCompensationEmployeeStockPurchasePlanDetails STOCK-BASED COMPENSATION - Employee Stock Purchase Plan (Details) Details 92 false false R93.htm 2412402 - Disclosure - EQUITY (Details) Sheet http://www.oxy.com/role/EquityDetails EQUITY (Details) Details http://www.oxy.com/role/EquityTables 93 false false R94.htm 2412403 - Disclosure - EQUITY EQUITY - Fair Value Measurement Inputs and Valuation Techniques (Details) Sheet http://www.oxy.com/role/EquityEquityFairValueMeasurementInputsAndValuationTechniquesDetails EQUITY EQUITY - Fair Value Measurement Inputs and Valuation Techniques (Details) Details 94 false false R95.htm 2413402 - Disclosure - EARNINGS PER SHARE - Calculation of EPS (Details) Sheet http://www.oxy.com/role/EarningsPerShareCalculationOfEpsDetails EARNINGS PER SHARE - Calculation of EPS (Details) Details 95 false false R96.htm 2414402 - Disclosure - PENSION AND POSTRETIREMENT BENEFIT PLANS - Defined Contribution Plans (Details) Sheet http://www.oxy.com/role/PensionAndPostretirementBenefitPlansDefinedContributionPlansDetails PENSION AND POSTRETIREMENT BENEFIT PLANS - Defined Contribution Plans (Details) Details 96 false false R97.htm 2414403 - Disclosure - PENSION AND POSTRETIREMENT BENEFIT PLANS - Defined Benefit Plan (Details) Sheet http://www.oxy.com/role/PensionAndPostretirementBenefitPlansDefinedBenefitPlanDetails PENSION AND POSTRETIREMENT BENEFIT PLANS - Defined Benefit Plan (Details) Details 97 false false R98.htm 2414404 - Disclosure - PENSION AND POSTRETIREMENT BENEFIT PLANS - Obligations and Funded Status of our Defined Benefit Plans (Details) Sheet http://www.oxy.com/role/PensionAndPostretirementBenefitPlansObligationsAndFundedStatusOfOurDefinedBenefitPlansDetails PENSION AND POSTRETIREMENT BENEFIT PLANS - Obligations and Funded Status of our Defined Benefit Plans (Details) Details 98 false false R99.htm 2414405 - Disclosure - PENSION AND POSTRETIREMENT BENEFIT PLANS - Obligations and Asset Fair Values (Details) Sheet http://www.oxy.com/role/PensionAndPostretirementBenefitPlansObligationsAndAssetFairValuesDetails PENSION AND POSTRETIREMENT BENEFIT PLANS - Obligations and Asset Fair Values (Details) Details 99 false false R100.htm 2414406 - Disclosure - PENSION AND POSTRETIREMENT BENEFIT PLANS - Cost (Details) Sheet http://www.oxy.com/role/PensionAndPostretirementBenefitPlansCostDetails PENSION AND POSTRETIREMENT BENEFIT PLANS - Cost (Details) Details http://www.oxy.com/role/PensionAndPostretirementBenefitPlansTables 100 false false R101.htm 2414407 - Disclosure - PENSION AND POSTRETIREMENT BENEFIT PLANS - Assumptions (Details) Sheet http://www.oxy.com/role/PensionAndPostretirementBenefitPlansAssumptionsDetails PENSION AND POSTRETIREMENT BENEFIT PLANS - Assumptions (Details) Details 101 false false R102.htm 2414408 - Disclosure - PENSION AND POSTRETIREMENT BENEFIT PLANS - Plan Assets (Details) Sheet http://www.oxy.com/role/PensionAndPostretirementBenefitPlansPlanAssetsDetails PENSION AND POSTRETIREMENT BENEFIT PLANS - Plan Assets (Details) Details 102 false false R103.htm 2414409 - Disclosure - PENSION AND POSTRETIREMENT BENEFIT PLANS - Benefit Payments (Details) Sheet http://www.oxy.com/role/PensionAndPostretirementBenefitPlansBenefitPaymentsDetails PENSION AND POSTRETIREMENT BENEFIT PLANS - Benefit Payments (Details) Details 103 false false R104.htm 2415402 - Disclosure - REVENUE RECOGNITION - Commodity Sales Contracts and Marketing (Details) Sheet http://www.oxy.com/role/RevenueRecognitionCommoditySalesContractsAndMarketingDetails REVENUE RECOGNITION - Commodity Sales Contracts and Marketing (Details) Details 104 false false R105.htm 2415403 - Disclosure - REVENUE RECOGNITION - Disaggregation of revenue (Details) Sheet http://www.oxy.com/role/RevenueRecognitionDisaggregationOfRevenueDetails REVENUE RECOGNITION - Disaggregation of revenue (Details) Details 105 false false R106.htm 2416402 - Disclosure - CONDENSED CONSOLIDATING FINANCIAL INFORMATION - Condensed Balance Sheet (Details) Sheet http://www.oxy.com/role/CondensedConsolidatingFinancialInformationCondensedBalanceSheetDetails CONDENSED CONSOLIDATING FINANCIAL INFORMATION - Condensed Balance Sheet (Details) Details 106 false false R107.htm 2416403 - Disclosure - CONDENSED CONSOLIDATING FINANCIAL INFORMATION - Condensed Income Statement (Details) Sheet http://www.oxy.com/role/CondensedConsolidatingFinancialInformationCondensedIncomeStatementDetails CONDENSED CONSOLIDATING FINANCIAL INFORMATION - Condensed Income Statement (Details) Details 107 false false R108.htm 2416404 - Disclosure - CONDENSED CONSOLIDATING FINANCIAL INFORMATION - Condensed Cash Flow Statement (Details) Sheet http://www.oxy.com/role/CondensedConsolidatingFinancialInformationCondensedCashFlowStatementDetails CONDENSED CONSOLIDATING FINANCIAL INFORMATION - Condensed Cash Flow Statement (Details) Details 108 false false All Reports Book All Reports a2019ye10-kdocument.htm a2019yeexhibit21listof.htm a2019yeexhibit231kpmgc.htm a2019yeexhibit232ryder.htm a2019yeexhibit233nsaic.htm a2019yeexhibit311ceoce.htm a2019yeexhibit312cfoce.htm a2019yeexhibit321ceoan.htm a2019yeexhibit416descr.htm a2019yeexhibit991ryder.htm a2019yeexhibit992nsai.htm crc-20191231.xsd crc-20191231_cal.xml crc-20191231_def.xml crc-20191231_lab.xml crc-20191231_pre.xml performancegraph2019.jpg http://xbrl.sec.gov/stpr/2018-01-31 http://fasb.org/us-gaap/2019-01-31 http://fasb.org/srt/2019-01-31 http://xbrl.sec.gov/dei/2019-01-31 true true