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Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)
 3 Months Ended 12 Months Ended
Dec. 31, 2014
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Schedule Of Significant Accounting Policies [Line Items]          
Asset impairment total $ 2,400,000,000us-gaap_AssetImpairmentCharges $ 2,357,000,000us-gaap_AssetImpairmentCharges $ 0us-gaap_AssetImpairmentCharges $ 0us-gaap_AssetImpairmentCharges  
Goodwill impairment charges 1,300,000,000us-gaap_GoodwillImpairmentLoss 1,300,000,000us-gaap_GoodwillImpairmentLoss 0us-gaap_GoodwillImpairmentLoss 0us-gaap_GoodwillImpairmentLoss  
Impairment of assets held for sale and other assets 1,000,000,000us-gaap_ImpairmentOfLongLivedAssetsToBeDisposedOf 1,000,000,000us-gaap_ImpairmentOfLongLivedAssetsToBeDisposedOf      
Cash and cash equivalents 769,000,000us-gaap_CashAndCashEquivalentsAtCarryingValue 769,000,000us-gaap_CashAndCashEquivalentsAtCarryingValue 1,906,000,000us-gaap_CashAndCashEquivalentsAtCarryingValue 160,000,000us-gaap_CashAndCashEquivalentsAtCarryingValue 295,000,000us-gaap_CashAndCashEquivalentsAtCarryingValue
Allowance for Doubtful Accounts 98,000,000us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent 98,000,000us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent 96,000,000us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent    
Capitalized internal costs 43,865,000,000us-gaap_CapitalizedCostsOilAndGasProducingActivitiesNet 43,865,000,000us-gaap_CapitalizedCostsOilAndGasProducingActivitiesNet 46,500,000,000us-gaap_CapitalizedCostsOilAndGasProducingActivitiesNet    
Impairment of operations   5,001,000,000us-gaap_ResultsOfOperationsImpairmentOfOilAndGasProperties 995,000,000us-gaap_ResultsOfOperationsImpairmentOfOilAndGasProperties 1,926,000,000us-gaap_ResultsOfOperationsImpairmentOfOilAndGasProperties  
Discount rate   10.00%apa_EstimatedFutureCashFlowsDiscountRate      
Write-down of the carrying value of Oil and Gas properties     920,000,000us-gaap_UnamortizedCostsCapitalizedLessRelatedDeferredIncomeTaxesExceedCeilingLimitationExpense    
Write-down of the carrying value of Oil and Gas properties, net of tax   3,100,000,000apa_UnamortizedCostsCapitalizedLessRelatedDeferredIncomeTaxesExceedCeilingLimitationsExpenseNetOfTax 541,000,000apa_UnamortizedCostsCapitalizedLessRelatedDeferredIncomeTaxesExceedCeilingLimitationsExpenseNetOfTax    
Significant portion of reserve quantity   Greater than 25 percent      
Gain (loss) recorded on divestitures   (539,000,000)us-gaap_GainLossOnSaleOfProperty 0us-gaap_GainLossOnSaleOfProperty 0us-gaap_GainLossOnSaleOfProperty  
Gathering, transmission and processing facilities 5,440,000,000apa_GasGatheringTransmissionAndProcessingFacilitiesNonCurrent 5,440,000,000apa_GasGatheringTransmissionAndProcessingFacilitiesNonCurrent 6,995,000,000apa_GasGatheringTransmissionAndProcessingFacilitiesNonCurrent    
Accumulated depreciation 55,382,000,000us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment 55,382,000,000us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment 47,398,000,000us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment    
Goodwill 87,000,000us-gaap_Goodwill 87,000,000us-gaap_Goodwill 1,369,000,000us-gaap_Goodwill    
Accounts payable   229,000,000apa_AccountsPayableChecksOutstandingExceedsBankBalance 271,000,000apa_AccountsPayableChecksOutstandingExceedsBankBalance    
Net cost of third party gas   46,000,000us-gaap_CostOfPurchasedOilAndGas 34,000,000us-gaap_CostOfPurchasedOilAndGas 27,000,000us-gaap_CostOfPurchasedOilAndGas  
Maximum percentage of production available to contract partners   40.00%apa_MaximumPercentageOfProductionAvailableToContractPartners      
Deferred income tax liability 1,700,000,000us-gaap_DeferredIncomeTaxLiabilities 1,700,000,000us-gaap_DeferredIncomeTaxLiabilities      
Additional net tax expense (benefit) related to foreign currency translation gains and losses   (56,000,000)us-gaap_ForeignIncomeTaxExpenseBenefitContinuingOperations (154,000,000)us-gaap_ForeignIncomeTaxExpenseBenefitContinuingOperations 16,000,000us-gaap_ForeignIncomeTaxExpenseBenefitContinuingOperations  
Other foreign currency gains and (losses)   8,000,000us-gaap_ForeignCurrencyTransactionGainLossBeforeTax (30,000,000)us-gaap_ForeignCurrencyTransactionGainLossBeforeTax 24,000,000us-gaap_ForeignCurrencyTransactionGainLossBeforeTax  
Benefit of tax deductions in excess of recognized compensation cost   35,000us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities 1,000,000us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities 4,000,000us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities  
Other Property and Equipment [Member]          
Schedule Of Significant Accounting Policies [Line Items]          
Accumulated depreciation 673,000,000us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= apa_OtherPropertyAndEquipmentMember		 673,000,000us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= apa_OtherPropertyAndEquipmentMember		 608,000,000us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= apa_OtherPropertyAndEquipmentMember		    
GTP Facilities [Member]          
Schedule Of Significant Accounting Policies [Line Items]          
Assets reduced in connection with divestiture 2,500,000,000us-gaap_DisposalGroupIncludingDiscontinuedOperationPropertyPlantAndEquipment
/ us-gaap_PublicUtilityAxis
= apa_GasGatheringTransmissionAndProcessingFacilitiesMember		 2,500,000,000us-gaap_DisposalGroupIncludingDiscontinuedOperationPropertyPlantAndEquipment
/ us-gaap_PublicUtilityAxis
= apa_GasGatheringTransmissionAndProcessingFacilitiesMember		      
Gathering, transmission and processing facilities 5,400,000,000apa_GasGatheringTransmissionAndProcessingFacilitiesNonCurrent
/ us-gaap_PublicUtilityAxis
= apa_GasGatheringTransmissionAndProcessingFacilitiesMember		 5,400,000,000apa_GasGatheringTransmissionAndProcessingFacilitiesNonCurrent
/ us-gaap_PublicUtilityAxis
= apa_GasGatheringTransmissionAndProcessingFacilitiesMember		 7,000,000,000apa_GasGatheringTransmissionAndProcessingFacilitiesNonCurrent
/ us-gaap_PublicUtilityAxis
= apa_GasGatheringTransmissionAndProcessingFacilitiesMember		    
Loss on the sale of GTP facilities   180,000,000us-gaap_GainsLossesOnSalesOfAssets
/ us-gaap_PublicUtilityAxis
= apa_GasGatheringTransmissionAndProcessingFacilitiesMember		 0us-gaap_GainsLossesOnSalesOfAssets
/ us-gaap_PublicUtilityAxis
= apa_GasGatheringTransmissionAndProcessingFacilitiesMember		 0us-gaap_GainsLossesOnSalesOfAssets
/ us-gaap_PublicUtilityAxis
= apa_GasGatheringTransmissionAndProcessingFacilitiesMember		  
Accumulated depreciation 1,700,000,000us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
/ us-gaap_PublicUtilityAxis
= apa_GasGatheringTransmissionAndProcessingFacilitiesMember		 1,700,000,000us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
/ us-gaap_PublicUtilityAxis
= apa_GasGatheringTransmissionAndProcessingFacilitiesMember		 1,500,000,000us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
/ us-gaap_PublicUtilityAxis
= apa_GasGatheringTransmissionAndProcessingFacilitiesMember		    
Kenya [Member]          
Schedule Of Significant Accounting Policies [Line Items]          
Impairment of operations     75,000,000us-gaap_ResultsOfOperationsImpairmentOfOilAndGasProperties
/ us-gaap_StatementGeographicalAxis
= country_KE		    
United States [Member]          
Schedule Of Significant Accounting Policies [Line Items]          
Capitalized internal costs 23,947,000,000us-gaap_CapitalizedCostsOilAndGasProducingActivitiesNet
/ us-gaap_StatementGeographicalAxis
= country_US		 23,947,000,000us-gaap_CapitalizedCostsOilAndGasProducingActivitiesNet
/ us-gaap_StatementGeographicalAxis
= country_US		 26,201,000,000us-gaap_CapitalizedCostsOilAndGasProducingActivitiesNet
/ us-gaap_StatementGeographicalAxis
= country_US		    
Impairment of operations   4,412,000,000us-gaap_ResultsOfOperationsImpairmentOfOilAndGasProperties
/ us-gaap_StatementGeographicalAxis
= country_US		 552,000,000us-gaap_ResultsOfOperationsImpairmentOfOilAndGasProperties
/ us-gaap_StatementGeographicalAxis
= country_US		    
Write-down of the carrying value of Oil and Gas properties   4,400,000,000us-gaap_UnamortizedCostsCapitalizedLessRelatedDeferredIncomeTaxesExceedCeilingLimitationExpense
/ us-gaap_StatementGeographicalAxis
= country_US		      
Write-down of the carrying value of Oil and Gas properties, net of tax   2,800,000,000apa_UnamortizedCostsCapitalizedLessRelatedDeferredIncomeTaxesExceedCeilingLimitationsExpenseNetOfTax
/ us-gaap_StatementGeographicalAxis
= country_US		 356,000,000apa_UnamortizedCostsCapitalizedLessRelatedDeferredIncomeTaxesExceedCeilingLimitationsExpenseNetOfTax
/ us-gaap_StatementGeographicalAxis
= country_US		    
Goodwill     1,000,000,000us-gaap_Goodwill
/ us-gaap_StatementGeographicalAxis
= country_US		    
Non-cash impairments of goodwill 1,000,000,000apa_NonCashImpairmentChargeToGoodwill
/ us-gaap_StatementGeographicalAxis
= country_US		        
North Sea [Member]          
Schedule Of Significant Accounting Policies [Line Items]          
Capitalized internal costs 4,760,000,000us-gaap_CapitalizedCostsOilAndGasProducingActivitiesNet
/ us-gaap_StatementGeographicalAxis
= apa_NorthSeaMember		 4,760,000,000us-gaap_CapitalizedCostsOilAndGasProducingActivitiesNet
/ us-gaap_StatementGeographicalAxis
= apa_NorthSeaMember		 5,269,000,000us-gaap_CapitalizedCostsOilAndGasProducingActivitiesNet
/ us-gaap_StatementGeographicalAxis
= apa_NorthSeaMember		    
Impairment of operations   589,000,000us-gaap_ResultsOfOperationsImpairmentOfOilAndGasProperties
/ us-gaap_StatementGeographicalAxis
= apa_NorthSeaMember		 367,000,000us-gaap_ResultsOfOperationsImpairmentOfOilAndGasProperties
/ us-gaap_StatementGeographicalAxis
= apa_NorthSeaMember		    
Write-down of the carrying value of Oil and Gas properties   589,000,000us-gaap_UnamortizedCostsCapitalizedLessRelatedDeferredIncomeTaxesExceedCeilingLimitationExpense
/ us-gaap_StatementGeographicalAxis
= apa_NorthSeaMember		      
Write-down of the carrying value of Oil and Gas properties, net of tax   224,000,000apa_UnamortizedCostsCapitalizedLessRelatedDeferredIncomeTaxesExceedCeilingLimitationsExpenseNetOfTax
/ us-gaap_StatementGeographicalAxis
= apa_NorthSeaMember		 139,000,000apa_UnamortizedCostsCapitalizedLessRelatedDeferredIncomeTaxesExceedCeilingLimitationsExpenseNetOfTax
/ us-gaap_StatementGeographicalAxis
= apa_NorthSeaMember		    
Argentina [Member]          
Schedule Of Significant Accounting Policies [Line Items]          
Capitalized internal costs     1,318,000,000us-gaap_CapitalizedCostsOilAndGasProducingActivitiesNet
/ us-gaap_StatementGeographicalAxis
= country_AR		    
Write-down of the carrying value of Oil and Gas properties, net of tax     118,000,000apa_UnamortizedCostsCapitalizedLessRelatedDeferredIncomeTaxesExceedCeilingLimitationsExpenseNetOfTax
/ us-gaap_StatementGeographicalAxis
= country_AR		    
Canada, Dollars          
Schedule Of Significant Accounting Policies [Line Items]          
Goodwill     103,000,000us-gaap_Goodwill
/ us-gaap_StatementGeographicalAxis
= currency_CAD		    
Non-cash impairments of goodwill 103,000,000apa_NonCashImpairmentChargeToGoodwill
/ us-gaap_StatementGeographicalAxis
= currency_CAD		        
Egypt [Member]          
Schedule Of Significant Accounting Policies [Line Items]          
Goodwill impairment charges     0us-gaap_GoodwillImpairmentLoss
/ us-gaap_StatementGeographicalAxis
= country_EG		    
Capitalized internal costs 4,055,000,000us-gaap_CapitalizedCostsOilAndGasProducingActivitiesNet
/ us-gaap_StatementGeographicalAxis
= country_EG		 4,055,000,000us-gaap_CapitalizedCostsOilAndGasProducingActivitiesNet
/ us-gaap_StatementGeographicalAxis
= country_EG		 3,722,000,000us-gaap_CapitalizedCostsOilAndGasProducingActivitiesNet
/ us-gaap_StatementGeographicalAxis
= country_EG		    
Goodwill 87,000,000us-gaap_Goodwill
/ us-gaap_StatementGeographicalAxis
= country_EG		 87,000,000us-gaap_Goodwill
/ us-gaap_StatementGeographicalAxis
= country_EG		 87,000,000us-gaap_Goodwill
/ us-gaap_StatementGeographicalAxis
= country_EG		    
Mobil North Sea Limited [Member]          
Schedule Of Significant Accounting Policies [Line Items]          
Goodwill     163,000,000us-gaap_Goodwill
/ us-gaap_StatementGeographicalAxis
= apa_MobilNorthSeaLimitedMember		    
Non-cash impairments of goodwill 163,000,000apa_NonCashImpairmentChargeToGoodwill
/ us-gaap_StatementGeographicalAxis
= apa_MobilNorthSeaLimitedMember		        
Apache Corporation [Member]          
Schedule Of Significant Accounting Policies [Line Items]          
Asset impairment total   175,000,000us-gaap_AssetImpairmentCharges
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		      
Cash and cash equivalents 267,000,000us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		 267,000,000us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		 155,000,000us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		   41,000,000us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Capitalized internal costs 373,000,000us-gaap_CapitalizedCostsOilAndGasProducingActivitiesNet
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		 373,000,000us-gaap_CapitalizedCostsOilAndGasProducingActivitiesNet
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		 401,000,000us-gaap_CapitalizedCostsOilAndGasProducingActivitiesNet
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		 402,000,000us-gaap_CapitalizedCostsOilAndGasProducingActivitiesNet
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		  
Goodwill     $ 173,000,000us-gaap_Goodwill
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		    
Minimum [Member]          
Schedule Of Significant Accounting Policies [Line Items]          
Voting interest required for consolidation of investments 50.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		 50.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		      
Minimum [Member] | Other Property and Equipment [Member]          
Schedule Of Significant Accounting Policies [Line Items]          
Useful lives of gas gathering, transmission and processing facilities   3 years      
Maximum [Member]          
Schedule Of Significant Accounting Policies [Line Items]          
Voting interest required for consolidation of investments 50.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		 50.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		      
Maximum [Member] | Other Property and Equipment [Member]          
Schedule Of Significant Accounting Policies [Line Items]          
Useful lives of gas gathering, transmission and processing facilities   20 years