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Derivative Instruments - Interest-Rate Derivatives Table (Detail) (Not Designated as Hedging Instrument [Member], USD $)
 12 Months Ended
Dec. 31, 2014
Interest-Rate Swap 1 [Member]
  
Derivative [Line Items]  
Notional principal amount of interest-rate swap 50,000,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= apc_InterestRateSwap1Member
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
Weighted-average interest rate for interest-rate swap 5.91%us-gaap_DerivativeAverageFixedInterestRate
/ us-gaap_DerivativeInstrumentRiskAxis
= apc_InterestRateSwap1Member
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
Interest-Rate Swap 1 [Member] | Minimum [Member]
  
Derivative [Line Items]  
Reference period for interest-rate swap Sep. 01, 2016
Interest-Rate Swap 1 [Member] | Maximum [Member]
  
Derivative [Line Items]  
Reference period for interest-rate swap Sep. 01, 2026
Interest-Rate Swap 2 [Member]
  
Derivative [Line Items]  
Notional principal amount of interest-rate swap 1,850,000,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= apc_InterestRateSwap2Member
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
Weighted-average interest rate for interest-rate swap 6.05%us-gaap_DerivativeAverageFixedInterestRate
/ us-gaap_DerivativeInstrumentRiskAxis
= apc_InterestRateSwap2Member
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
Interest-Rate Swap 2 [Member] | Minimum [Member]
  
Derivative [Line Items]  
Reference period for interest-rate swap Sep. 01, 2016
Interest-Rate Swap 2 [Member] | Maximum [Member]
  
Derivative [Line Items]  
Reference period for interest-rate swap Sep. 01, 2046