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Derivative Instruments - Additional Information (Detail) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Derivative [Line Items]      
Cash received (paid) in settlement of derivative instruments $ 371,000,000apc_CashReceivedPaidInSettlementOfDerivativeInstrumentsNotDesignatedAsHedgingInstruments $ 85,000,000apc_CashReceivedPaidInSettlementOfDerivativeInstrumentsNotDesignatedAsHedgingInstruments $ 685,000,000apc_CashReceivedPaidInSettlementOfDerivativeInstrumentsNotDesignatedAsHedgingInstruments
Cash paid in settlement of interest-rate swap agreements 222,000,000us-gaap_PaymentsForDerivativeInstrumentFinancingActivities 0us-gaap_PaymentsForDerivativeInstrumentFinancingActivities 0us-gaap_PaymentsForDerivativeInstrumentFinancingActivities
5.0 billion Facility [Member] | Revolving Credit Facility [Member]      
Derivative [Line Items]      
Line of credit, maximum capacity 5,000,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_DebtInstrumentAxis
= apc_RevolvingCreditFacility1Member
   
Senior Notes [Member] | Senior Note 16 And Senior Note 17 [Member]      
Derivative [Line Items]      
Debt instrument, principal amount 1,250,000,000.00us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= apc_SeniorNote16AndSeniorNote17Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
   
Securing most derivative counterparties [Member] | 5.0 billion Facility [Member] | Revolving Credit Facility [Member]      
Derivative [Line Items]      
Line of credit, maximum capacity 5,000,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_DebtInstrumentAxis
= apc_RevolvingCreditFacility1Member
/ us-gaap_DerivativeByNatureAxis
= apc_SecuringMostDerivativeCounterpartiesMember
   
Not Designated as Hedging Instrument [Member]      
Derivative [Line Items]      
Gross derivative liability 1,455,000,000us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
986,000,000us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
 
Aggregate fair value of derivative instruments with credit-risk-related contingent features for which a net liability position existed 97,000,000us-gaap_DerivativeNetLiabilityPositionAggregateFairValue
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
42,000,000us-gaap_DerivativeNetLiabilityPositionAggregateFairValue
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
 
Not Designated as Hedging Instrument [Member] | Commodity [Member] | Natural Gas [Member]      
Derivative [Line Items]      
Financial derivative transactions 6,000,000us-gaap_DerivativeNonmonetaryNotionalAmountVolume
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
/ us-gaap_ReserveQuantitiesByTypeOfReserveAxis
= us-gaap_NaturalGasReservesMember
/ us-gaap_TradingActivityByTypeAxis
= us-gaap_CommodityMember
16,000,000us-gaap_DerivativeNonmonetaryNotionalAmountVolume
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
/ us-gaap_ReserveQuantitiesByTypeOfReserveAxis
= us-gaap_NaturalGasReservesMember
/ us-gaap_TradingActivityByTypeAxis
= us-gaap_CommodityMember
 
Not Designated as Hedging Instrument [Member] | Permitted to Offset Gross Derivative Asset with Financial Institutions [Member]      
Derivative [Line Items]      
Gross derivative liability 289,000,000us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_DerivativeByNatureAxis
= apc_PermittedToOffsetGrossDerivativeAssetWithFinancialInstitutionsMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
76,000,000us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_DerivativeByNatureAxis
= apc_PermittedToOffsetGrossDerivativeAssetWithFinancialInstitutionsMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
 
Not Designated as Hedging Instrument [Member] | Price Risk Derivative [Member] | Three-Way Collars Oil 2015 [Member]      
Derivative [Line Items]      
Oil derivative nonmonetary notional amount per day 25us-gaap_DerivativeNonmonetaryNotionalAmountFlowRate
/ us-gaap_DerivativeByNatureAxis
= apc_ThreeWayCollarsOil2015Member
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_PriceRiskDerivativeMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
   
Cash received (paid) in settlement of derivative instruments 126,000,000apc_CashReceivedPaidInSettlementOfDerivativeInstrumentsNotDesignatedAsHedgingInstruments
/ us-gaap_DerivativeByNatureAxis
= apc_ThreeWayCollarsOil2015Member
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_PriceRiskDerivativeMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
   
Not Designated as Hedging Instrument [Member] | Modified Interest Rate Swap [Member]      
Derivative [Line Items]      
Interest-rate swap reference-period start date Jun. 01, 2014   Oct. 01, 2012
Aggregate notional principal amount of interest-rate swap 1,100,000,000.0invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= apc_ModifiedInterestRateSwapMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
  800,000,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= apc_ModifiedInterestRateSwapMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
Not Designated as Hedging Instrument [Member] | Settled Interest Rate Swap [Member]      
Derivative [Line Items]      
Cash received (paid) in settlement of derivative instruments     (64,000,000)apc_CashReceivedPaidInSettlementOfDerivativeInstrumentsNotDesignatedAsHedgingInstruments
/ us-gaap_DerivativeInstrumentRiskAxis
= apc_SettledInterestRateSwapMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
Aggregate notional principal amount of interest-rate swap 750,000,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= apc_SettledInterestRateSwapMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
  200,000,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= apc_SettledInterestRateSwapMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
Cash paid in settlement of interest-rate swap agreements $ 222,000,000us-gaap_PaymentsForDerivativeInstrumentFinancingActivities
/ us-gaap_DerivativeInstrumentRiskAxis
= apc_SettledInterestRateSwapMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember