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Financial Risk Management - Corporate Financial Risk Management Activities - Additional Information (Detail) (USD $)
 3 Months Ended
Mar. 31, 2015
BOPD
Mar. 31, 2014
Dec. 31, 2014
Derivative [Line Items]      
Total number of barrels per day hedged based on crude oil fixed-price swap contracts 50,000hes_NumberOfBarrelsPerDayHedgedCrudeOilCashFlowHedges    
Cost of hedging $ 38,000,000us-gaap_DerivativeCostOfHedge    
Interest rate swap [Member]      
Derivative [Line Items]      
Derivative notional amount 1,300,000,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember		   1,300,000,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
Derivative cash proceeds on hedge 41,000,000us-gaap_DerivativeCashReceivedOnHedge
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember		    
Foreign Exchange [Member]      
Derivative [Line Items]      
Gain (loss) on derivative instruments pre-tax 15,000,000us-gaap_GainLossOnDerivativeInstrumentsNetPretax
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeMember		 (6,000,000)us-gaap_GainLossOnDerivativeInstrumentsNetPretax
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeMember		  
Interest Rate Swaps and Fixed-rate Debt [Member]      
Derivative [Line Items]      
Change in the fair value of interest rate swaps - increase/(decrease) 10,000,000us-gaap_ChangeInUnrealizedGainLossOnFairValueHedgingInstruments1
/ us-gaap_HedgingDesignationAxis
= hes_InterestRateSwapsAndFixedRateDebtMember		 1,000,000us-gaap_ChangeInUnrealizedGainLossOnFairValueHedgingInstruments1
/ us-gaap_HedgingDesignationAxis
= hes_InterestRateSwapsAndFixedRateDebtMember		  
Not Designated Hedges [Member] | Foreign Exchange [Member]      
Derivative [Line Items]      
Gain (loss) on derivative instruments pre-tax 98,000,000us-gaap_GainLossOnDerivativeInstrumentsNetPretax
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember		 0us-gaap_GainLossOnDerivativeInstrumentsNetPretax
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember		  
Corporate Risk Management [Member] | New Brent Crude Hedges [Member]      
Derivative [Line Items]      
After-tax deferred gains in Accumulated other comprehensive income (loss) 12,000,000us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax
/ us-gaap_DerivativeByNatureAxis
= hes_CorporateRiskManagementMember
/ us-gaap_HedgingDesignationAxis
= hes_NewBrentCrudeHedgesMember		    
Gain (Loss) on Price Risk Fair Value Hedge Ineffectiveness 0us-gaap_GainLossOnPriceRiskFairValueHedgeIneffectiveness
/ us-gaap_DerivativeByNatureAxis
= hes_CorporateRiskManagementMember
/ us-gaap_HedgingDesignationAxis
= hes_NewBrentCrudeHedgesMember		 (1,000,000)us-gaap_GainLossOnPriceRiskFairValueHedgeIneffectiveness
/ us-gaap_DerivativeByNatureAxis
= hes_CorporateRiskManagementMember
/ us-gaap_HedgingDesignationAxis
= hes_NewBrentCrudeHedgesMember		  
Gain (Loss) on Fair Value Hedges Recognized in Earnings $ 12,000,000us-gaap_GainLossOnFairValueHedgesRecognizedInEarnings
/ us-gaap_DerivativeByNatureAxis
= hes_CorporateRiskManagementMember
/ us-gaap_HedgingDesignationAxis
= hes_NewBrentCrudeHedgesMember		    
Minimum [Member]      
Derivative [Line Items]      
Price per barrel 60us-gaap_UnderlyingDerivativeVolume
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		    
Maximum [Member]      
Derivative [Line Items]      
Price per barrel 80us-gaap_UnderlyingDerivativeVolume
/ us-gaap_RangeAxis
= us-gaap_MaximumMember