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Property, Plant and Equipment - Components of Property, Plant and Equipment (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Exploration and Production    
Unproved properties $ 1,468us-gaap_UnprovedOilAndGasPropertySuccessfulEffortMethod $ 2,460us-gaap_UnprovedOilAndGasPropertySuccessfulEffortMethod
Proved properties 4,211us-gaap_ProvedOilAndGasPropertySuccessfulEffortMethod 4,121us-gaap_ProvedOilAndGasPropertySuccessfulEffortMethod
Wells, equipment and related facilities 40,649us-gaap_CapitalizedCostsWellsAndRelatedEquipmentAndFacilities 37,274us-gaap_CapitalizedCostsWellsAndRelatedEquipmentAndFacilities
Total Exploration and Production costs 46,328us-gaap_CapitalizedCostsOilAndGasProducingActivitiesGross 43,855us-gaap_CapitalizedCostsOilAndGasProducingActivitiesGross
Corporate, Interest and Other 194hes_CorporateInterestAndOther 2,095hes_CorporateInterestAndOther
Total — at cost 46,522us-gaap_PropertyPlantAndEquipmentGross 45,950us-gaap_PropertyPlantAndEquipmentGross
Less: Reserves for depreciation, depletion, amortization and lease impairment 19,005us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment 17,179us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Property, plant and equipment — net $ 27,517us-gaap_PropertyPlantAndEquipmentNet $ 28,771us-gaap_PropertyPlantAndEquipmentNet