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Debt and Interest Expense - Additional Information (Detail) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2006
Dec. 31, 2013
Dec. 31, 2012
Feb. 25, 2014
Debt Instrument [Line Items]          
Debt instrument, accreted value $ 15,071,000,000us-gaap_LongTermDebt   $ 13,557,000,000us-gaap_LongTermDebt $ 13,269,000,000us-gaap_LongTermDebt  
Fair Value, Inputs, Level 2 [Member] | Market Approach Valuation Technique [Member]          
Debt Instrument [Line Items]          
Estimated fair value of total borrowings 17,400,000,000us-gaap_DebtInstrumentFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_ValuationTechniqueAxis
= us-gaap_MarketApproachValuationTechniqueMember
  15,300,000,000us-gaap_DebtInstrumentFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_ValuationTechniqueAxis
= us-gaap_MarketApproachValuationTechniqueMember
   
Senior Notes [Member] | Zero-Coupon Senior Notes due 2036 [Member]          
Debt Instrument [Line Items]          
Loan proceeds upon issuing debt   500,000,000us-gaap_ProceedsFromIssuanceOfUnsecuredDebt
/ us-gaap_DebtInstrumentAxis
= apc_SeniorNotesZeroCouponMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
     
Debt instrument, maturity date Oct. 10, 2036        
Debt instrument, principal amount 2,360,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= apc_SeniorNotesZeroCouponMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
  2,360,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= apc_SeniorNotesZeroCouponMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
   
Yield to maturity 5.24%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_DebtInstrumentAxis
= apc_SeniorNotesZeroCouponMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
       
Debt instrument, accreted value 765,000,000us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= apc_SeniorNotesZeroCouponMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
       
Revolving Credit Facility [Member] | 5.0 billion Facility [Member]          
Debt Instrument [Line Items]          
Line of credit, maximum capacity 5,000,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_DebtInstrumentAxis
= apc_RevolvingCreditFacility1Member
       
Line of credit, expiration date Sep. 02, 2015        
Percentage of capital stock of certain wholly owned foreign subsidiaries 65.00%apc_PercentageVotingCapitalStockForeignSubsidiaries
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_DebtInstrumentAxis
= apc_RevolvingCreditFacility1Member
       
Line of credit, outstanding borrowings 0us-gaap_LineOfCredit
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_DebtInstrumentAxis
= apc_RevolvingCreditFacility1Member
       
Revolving Credit Facility [Member] | Five-Year Facility [Member]          
Debt Instrument [Line Items]          
Line of credit, maximum capacity 3,000,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_DebtInstrumentAxis
= apc_RevolvingCreditFacility3Member
       
Debt instrument, term 5 years        
Line of credit, expandable maximum capacity 4,000,000,000apc_LineOfCreditFacilityExpandableMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_DebtInstrumentAxis
= apc_RevolvingCreditFacility3Member
       
Revolving Credit Facility [Member] | Five-Year Facility [Member] | Minimum [Member]          
Debt Instrument [Line Items]          
Applicable margin added 0.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_DebtInstrumentAxis
= apc_RevolvingCreditFacility3Member
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
       
Revolving Credit Facility [Member] | Five-Year Facility [Member] | Maximum [Member]          
Debt Instrument [Line Items]          
Applicable margin added 1.65%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_DebtInstrumentAxis
= apc_RevolvingCreditFacility3Member
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
       
Ratio of indebtedness to total capital 0.65us-gaap_RatioOfIndebtednessToNetCapital1
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_DebtInstrumentAxis
= apc_RevolvingCreditFacility3Member
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
       
Revolving Credit Facility [Member] | 364-Day Facility [Member]          
Debt Instrument [Line Items]          
Line of credit, maximum capacity 2,000,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_DebtInstrumentAxis
= apc_RevolvingCreditFacility4Member
       
Debt instrument, term 364 days        
Revolving Credit Facility [Member] | 364-Day Facility [Member] | Minimum [Member]          
Debt Instrument [Line Items]          
Applicable margin added 0.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_DebtInstrumentAxis
= apc_RevolvingCreditFacility4Member
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
       
Revolving Credit Facility [Member] | 364-Day Facility [Member] | Maximum [Member]          
Debt Instrument [Line Items]          
Applicable margin added 1.675%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_DebtInstrumentAxis
= apc_RevolvingCreditFacility4Member
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
       
Ratio of indebtedness to total capital 0.65us-gaap_RatioOfIndebtednessToNetCapital1
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_DebtInstrumentAxis
= apc_RevolvingCreditFacility4Member
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
       
Revolving Credit Facility [Member] | WES RCF [Member] | Western Gas Partners, LP [Member]          
Debt Instrument [Line Items]          
Line of credit, maximum capacity 1,200,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis
= us-gaap_PartnershipMember
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_DebtInstrumentAxis
= apc_RevolvingCreditFacility2Member
      800,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis
= us-gaap_PartnershipMember
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_DebtInstrumentAxis
= apc_RevolvingCreditFacility2Member
Line of credit, expiration date Feb. 26, 2019        
Line of credit, outstanding borrowings 510,000,000us-gaap_LineOfCredit
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis
= us-gaap_PartnershipMember
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_DebtInstrumentAxis
= apc_RevolvingCreditFacility2Member
  0us-gaap_LineOfCredit
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis
= us-gaap_PartnershipMember
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_DebtInstrumentAxis
= apc_RevolvingCreditFacility2Member
   
Line of credit, expandable maximum capacity 1,500,000,000apc_LineOfCreditFacilityExpandableMaximumBorrowingCapacity
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis
= us-gaap_PartnershipMember
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_DebtInstrumentAxis
= apc_RevolvingCreditFacility2Member
       
Line of credit, interest rate 1.47%us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis
= us-gaap_PartnershipMember
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_DebtInstrumentAxis
= apc_RevolvingCreditFacility2Member
       
Line of credit, available borrowing capacity 677,000,000us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis
= us-gaap_PartnershipMember
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_DebtInstrumentAxis
= apc_RevolvingCreditFacility2Member
       
Outstanding letters of credit $ 13,000,000us-gaap_LettersOfCreditOutstandingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis
= us-gaap_PartnershipMember
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_DebtInstrumentAxis
= apc_RevolvingCreditFacility2Member
       
Revolving Credit Facility [Member] | WES RCF [Member] | Minimum [Member] | London Interbank Offered Rate (LIBOR) [Member] | Western Gas Partners, LP [Member]          
Debt Instrument [Line Items]          
Applicable margin added 0.975%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis
= us-gaap_PartnershipMember
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_DebtInstrumentAxis
= apc_RevolvingCreditFacility2Member
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember
       
Revolving Credit Facility [Member] | WES RCF [Member] | Maximum [Member] | London Interbank Offered Rate (LIBOR) [Member] | Western Gas Partners, LP [Member]          
Debt Instrument [Line Items]          
Applicable margin added 1.45%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis
= us-gaap_PartnershipMember
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_DebtInstrumentAxis
= apc_RevolvingCreditFacility2Member
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember