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Segment Information - Reconciliation of Consolidated Adjusted EBITDAX to Income (Loss) before Income Taxes Table (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Segment Reporting [Abstract]      
Income (loss) before income taxes $ 54us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest $ 2,106us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest $ 3,565us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Exploration expense 1,639us-gaap_ExplorationExpense 1,329us-gaap_ExplorationExpense 1,946us-gaap_ExplorationExpense
DD&A 4,550us-gaap_DepreciationDepletionAndAmortization 3,927us-gaap_DepreciationDepletionAndAmortization 3,964us-gaap_DepreciationDepletionAndAmortization
Impairments 836us-gaap_AssetImpairmentCharges 794us-gaap_AssetImpairmentCharges 389us-gaap_AssetImpairmentCharges
Interest expense 772us-gaap_InterestAndDebtExpense 686us-gaap_InterestAndDebtExpense 742us-gaap_InterestAndDebtExpense
Total (gains) losses on derivatives, net, less net cash from settlement of commodity derivatives 578apc_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNetLessCashReceivedPaidInSettlementOfCommodityDerivativeInstruments (307)apc_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNetLessCashReceivedPaidInSettlementOfCommodityDerivativeInstruments 443apc_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNetLessCashReceivedPaidInSettlementOfCommodityDerivativeInstruments
Deepwater Horizon settlement and related costs 97us-gaap_GainLossRelatedToLitigationSettlement 15us-gaap_GainLossRelatedToLitigationSettlement 18us-gaap_GainLossRelatedToLitigationSettlement
Algeria exceptional profits tax settlement 0us-gaap_LitigationSettlementAmount 33us-gaap_LitigationSettlementAmount (1,797)us-gaap_LitigationSettlementAmount
Tronox-related contingent loss 4,360us-gaap_LossContingencyLossInPeriod 850us-gaap_LossContingencyLossInPeriod (250)us-gaap_LossContingencyLossInPeriod
Segment Reporting Information [Line Items]      
Less net income attributable to noncontrolling interests 187us-gaap_NetIncomeLossAttributableToNoncontrollingInterest 140us-gaap_NetIncomeLossAttributableToNoncontrollingInterest 54us-gaap_NetIncomeLossAttributableToNoncontrollingInterest
Consolidated Adjusted EBITDAX 12,721apc_ConsolidatedAdjustedEbitdax 9,403apc_ConsolidatedAdjustedEbitdax 8,966apc_ConsolidatedAdjustedEbitdax
Certain Other Nonoperating Items [Member]      
Segment Reporting Information [Line Items]      
Certain other nonoperating items $ 22us-gaap_LossContingencyAccrualCarryingValuePeriodIncreaseDecrease
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= apc_CertainOtherNonoperatingItemsMember
$ 110us-gaap_LossContingencyAccrualCarryingValuePeriodIncreaseDecrease
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= apc_CertainOtherNonoperatingItemsMember
$ 0us-gaap_LossContingencyAccrualCarryingValuePeriodIncreaseDecrease
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= apc_CertainOtherNonoperatingItemsMember