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STOCKHOLDERS' EQUITY (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Oct. 02, 2014
Common stock issuances        
Balance at the beginning of the year 889,919,058us-gaap_CommonStockSharesOutstanding 888,801,000us-gaap_CommonStockSharesOutstanding 886,809,000us-gaap_CommonStockSharesOutstanding  
Issued 584,000us-gaap_StockIssuedDuringPeriodSharesNewIssues 826,000us-gaap_StockIssuedDuringPeriodSharesNewIssues 1,746,000us-gaap_StockIssuedDuringPeriodSharesNewIssues  
Options exercised and other, net 55,000oxy_StockIssuedDuringPeriodSharesStockOptionsExercisedAndOther 292,000oxy_StockIssuedDuringPeriodSharesStockOptionsExercisedAndOther 246,000oxy_StockIssuedDuringPeriodSharesStockOptionsExercisedAndOther  
Balance at the end of the year 890,557,537us-gaap_CommonStockSharesOutstanding 889,919,058us-gaap_CommonStockSharesOutstanding 888,801,000us-gaap_CommonStockSharesOutstanding  
TREASURY STOCK        
Share repurchase program, authorized shares       185,000,000us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased
TREASURY STOCK        
Shares purchased under share repurchase program 25,800,000us-gaap_TreasuryStockSharesAcquired 10,300,000us-gaap_TreasuryStockSharesAcquired    
Share repurchase program, average cost per share of shares repurchased during period $ 93.40us-gaap_TreasuryStockAcquiredAverageCostPerShare $ 94.42us-gaap_TreasuryStockAcquiredAverageCostPerShare    
Treasury stock, shares 119,951,199us-gaap_TreasuryStockShares 93,928,179us-gaap_TreasuryStockShares 83,300,000us-gaap_TreasuryStockShares  
NONREDEEMABLE PREFERRED STOCK        
Preferred stock, authorized shares 50,000,000us-gaap_PreferredStockSharesAuthorized 50,000,000us-gaap_PreferredStockSharesAuthorized 50,000,000us-gaap_PreferredStockSharesAuthorized  
Preferred stock, par value $ 1.00us-gaap_PreferredStockParOrStatedValuePerShare $ 1.00us-gaap_PreferredStockParOrStatedValuePerShare $ 1.00us-gaap_PreferredStockParOrStatedValuePerShare  
Preferred stock, outstanding shares 0us-gaap_PreferredStockSharesOutstanding 0us-gaap_PreferredStockSharesOutstanding 0us-gaap_PreferredStockSharesOutstanding  
Basic EPS        
(Loss) / Income from continuing operations $ (130,000,000)us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest $ 4,932,000,000us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest $ 3,829,000,000us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest  
Less: Income from continuing operations attributable to noncontrolling interest (14,000,000)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest      
(Loss) / Income from continuing operations (144,000,000)us-gaap_IncomeLossFromContinuingOperations 4,932,000,000us-gaap_IncomeLossFromContinuingOperations 3,829,000,000us-gaap_IncomeLossFromContinuingOperations  
Discontinued operations, net 760,000,000us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax 971,000,000us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax 769,000,000us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax  
NET INCOME ATTRIBUTABLE TO COMMON STOCK 616,000,000us-gaap_NetIncomeLoss 5,903,000,000us-gaap_NetIncomeLoss 4,598,000,000us-gaap_NetIncomeLoss  
Less: Net income allocated to participating securities   (13,000,000)us-gaap_UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic (8,000,000)us-gaap_UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic  
Net income attributable to common stock, net of participating securities 616,000,000us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic 5,890,000,000us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic 4,590,000,000us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic  
Weighted average number of basic shares 781,100,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 804,100,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 809,300,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic  
Basic EPS (in dollars per share) $ 0.79us-gaap_EarningsPerShareBasic $ 7.33us-gaap_EarningsPerShareBasic $ 5.67us-gaap_EarningsPerShareBasic  
Diluted EPS        
Net income attributable to common stock, net of participating securities 616,000,000us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic 5,890,000,000us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic 4,590,000,000us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic  
Weighted average number of basic shares 781,100,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 804,100,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 809,300,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic  
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements   500,000us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements 700,000us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements  
Total diluted weighted average common shares 781,100,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 804,600,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 810,000,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding  
Earnings Per Share, Diluted $ 0.79us-gaap_EarningsPerShareDiluted $ 7.32us-gaap_EarningsPerShareDiluted $ 5.67us-gaap_EarningsPerShareDiluted  
ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)        
Foreign currency translation adjustments (7,000,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax (5,000,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax    
Unrealized losses on derivatives (11,000,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax (14,000,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax    
Pension and post-retirement adjustments (339,000,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax (284,000,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax    
Accumulated other comprehensive income (loss) $ (357,000,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax $ (303,000,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax    
Subsequent event        
TREASURY STOCK        
Share repurchase program, increase in authorized shares       60,000,000oxy_StockRepurchaseProgramIncreaseInNumberOfSharesAuthorizedToBeRepurchased
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