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Derivative Instruments - Oil and Natural-Gas Production/Processing Derivative Activities Table (Detail) (Not Designated as Hedging Instrument [Member], Price Risk Derivative [Member])
 3 Months Ended
Mar. 31, 2015
Three-Way Collars Natural Gas 2015 [Member]
  
Derivative [Line Items]  
Natural-gas derivative nonmonetary notional amount per day 635,000apc_DerivativeNonmonetaryNotionalAmountFlowRate1
/ us-gaap_DerivativeByNatureAxis
= apc_ThreeWayCollarsNaturalGas2015Member
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_PriceRiskDerivativeMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
Extendable Fixed Price Contracts Natural Gas 2015 [Member]
  
Derivative [Line Items]  
Natural-gas derivative nonmonetary notional amount per day 170,000apc_DerivativeNonmonetaryNotionalAmountFlowRate1
/ us-gaap_DerivativeByNatureAxis
= apc_ExtendableFixedPriceContractsNaturalGas2015Member
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_PriceRiskDerivativeMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember		 [1]
Average price per MMBtu  
Average price per MMBtu 4.17us-gaap_DerivativeAverageForwardPrice
/ us-gaap_DerivativeByNatureAxis
= apc_ExtendableFixedPriceContractsNaturalGas2015Member
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_PriceRiskDerivativeMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
Call Option [Member] | Short [Member] | Three-Way Collars Natural Gas 2015 [Member]
  
Average price per MMBtu  
Average ceiling price 4.76us-gaap_DerivativeAverageCapPrice
/ us-gaap_DerivativeByNatureAxis
= apc_ThreeWayCollarsNaturalGas2015Member
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_PriceRiskDerivativeMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
/ us-gaap_InvestmentTypeAxis
= us-gaap_CallOptionMember
/ us-gaap_PositionAxis
= us-gaap_ShortMember
Put Option [Member] | Short [Member] | Three-Way Collars Natural Gas 2015 [Member]
  
Average price per MMBtu  
Average floor price 2.75us-gaap_DerivativeAverageFloorPrice
/ us-gaap_DerivativeByNatureAxis
= apc_ThreeWayCollarsNaturalGas2015Member
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_PriceRiskDerivativeMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
/ us-gaap_InvestmentTypeAxis
= us-gaap_PutOptionMember
/ us-gaap_PositionAxis
= us-gaap_ShortMember
Put Option [Member] | Long [Member] | Three-Way Collars Natural Gas 2015 [Member]
  
Average price per MMBtu  
Average floor price 3.75us-gaap_DerivativeAverageFloorPrice
/ us-gaap_DerivativeByNatureAxis
= apc_ThreeWayCollarsNaturalGas2015Member
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_PriceRiskDerivativeMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
/ us-gaap_InvestmentTypeAxis
= us-gaap_PutOptionMember
/ us-gaap_PositionAxis
= us-gaap_LongMember
[1] The extendable fixed-price contracts have a contract term of January 2015 to December 2015 with an option for the counterparty to extend the contract term to December 2016 at the same price.