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Equity-Method Investments (Detail) (Equity-Method Investments [Member], USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2007
Schedule of Equity Method Investments [Line Items]        
Ownership interest of investee entities 95.00%apc_OtherOwnershipInterest      
Carrying amount of notes payable to affiliates $ 2,900,000,000us-gaap_DueToAffiliateNoncurrent     $ 2,900,000,000us-gaap_DueToAffiliateNoncurrent
Carrying amount of investments 2,800,000,000us-gaap_EquityMethodInvestments      
Applicable interest rate 1.24%us-gaap_DebtInstrumentInterestRateEffectivePercentage 1.24%us-gaap_DebtInstrumentInterestRateEffectivePercentage    
Interest expense on the notes payable 36,000,000us-gaap_OtherNonoperatingExpense 37,000,000us-gaap_OtherNonoperatingExpense 42,000,000us-gaap_OtherNonoperatingExpense  
Equity earnings from investments in the investee entities (45,000,000)us-gaap_IncomeLossFromEquityMethodInvestments (42,000,000)us-gaap_IncomeLossFromEquityMethodInvestments (43,000,000)us-gaap_IncomeLossFromEquityMethodInvestments  
Maximum [Member]
        
Schedule of Equity Method Investments [Line Items]        
Debt-to-capital ratio covenant 0.67us-gaap_RatioOfIndebtednessToNetCapital1
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= apc_EquityMethodInvestment1Member		      
Contributed Property to Investees [Member]
        
Schedule of Equity Method Investments [Line Items]        
Fair value of oil and gas properties and gathering and processing assets contributed by Anadarko       $ 2,900,000,000us-gaap_PropertyPlantAndEquipmentFairValueDisclosure
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= apc_ContributedPropertyToInvesteesMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= apc_EquityMethodInvestment1Member