Financial Risk Management and Trading Activities - Trading Activities - Additional Information (Detail)	12 Months Ended
Dec. 31, 2014
Derivative Instruments And Hedging Activities Disclosure [Abstract]
Percentage of information disclosed for trading partnership	100.00%

Percentage of information disclosed for trading partnership.

No definition available.

Name:	hes_PercentageOfInformationDisclosedForTradingPartnership
Namespace Prefix:	hes_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration